Podcast
Questions and Answers
Damage to the loose areolar tissue layer of the scalp is particularly dangerous due to what?
Damage to the loose areolar tissue layer of the scalp is particularly dangerous due to what?
- The presence of dense connective tissue restricting the spread of hematomas.
- Attachment of the dense tendinous structure creating difficulty in surgical repair.
- The absence of arteries and veins making the tissue prone to necrosis.
- Increased risk of infection spreading via emissary veins extending to diploic veins. (correct)
Which layer of the scalp is described as possessing a spongy structure containing a few arteries and emissary veins, facilitating communication between superficial scalp veins and diploic veins of the skull?
Which layer of the scalp is described as possessing a spongy structure containing a few arteries and emissary veins, facilitating communication between superficial scalp veins and diploic veins of the skull?
- Loose areolar tissue (correct)
- Connective tissue
- Skin
- Aponeurosis
A surgeon is preparing to make an incision in the scalp. Understanding the scalp's anatomy, which layer must they carefully manage due to its rich vascular supply and potential for significant bleeding?
A surgeon is preparing to make an incision in the scalp. Understanding the scalp's anatomy, which layer must they carefully manage due to its rich vascular supply and potential for significant bleeding?
- Skin and connective tissue. (correct)
- Pericranium.
- Aponeurosis.
- Loose areolar tissue.
How do superficial temporal and supraorbital arteries reach the scalp?
How do superficial temporal and supraorbital arteries reach the scalp?
During a craniotomy, a surgeon makes an incision through the first three layers of the scalp. What is the collective term for these layers and why is it clinically relevant?
During a craniotomy, a surgeon makes an incision through the first three layers of the scalp. What is the collective term for these layers and why is it clinically relevant?
What is the key characteristic of the connective tissue layer of the scalp that contributes to significant bleeding when injured?
What is the key characteristic of the connective tissue layer of the scalp that contributes to significant bleeding when injured?
A patient presents with an injury to the scalp in an area anterior to the auricle. Which nerve is least likely to be involved in providing sensory innervation to the affected region?
A patient presents with an injury to the scalp in an area anterior to the auricle. Which nerve is least likely to be involved in providing sensory innervation to the affected region?
Occlusion of the supratrochlear artery would directly compromise blood flow to which region of the scalp?
Occlusion of the supratrochlear artery would directly compromise blood flow to which region of the scalp?
Given the anatomical arrangement of the scalp's vascular supply, which statement best describes the typical approach to controlling bleeding during scalp surgery?
Given the anatomical arrangement of the scalp's vascular supply, which statement best describes the typical approach to controlling bleeding during scalp surgery?
In a patient presenting with a scalp laceration, a physician notes that the bleeding is profuse and difficult to control. Which anatomical feature of the scalp is most likely contributing to this clinical challenge?
In a patient presenting with a scalp laceration, a physician notes that the bleeding is profuse and difficult to control. Which anatomical feature of the scalp is most likely contributing to this clinical challenge?
A patient reports sensory loss over the anterior aspect of their scalp following a surgical procedure. Which nerve is most likely to have been affected?
A patient reports sensory loss over the anterior aspect of their scalp following a surgical procedure. Which nerve is most likely to have been affected?
A patient exhibits paralysis of the frontalis muscle, preventing them from raising their eyebrows. Which of the following nerves is most likely affected?
A patient exhibits paralysis of the frontalis muscle, preventing them from raising their eyebrows. Which of the following nerves is most likely affected?
Following a traumatic injury to the head, a patient presents with an impaired ability to wrinkle their forehead vertically. Which muscle and its associated nerve are most likely affected?
Following a traumatic injury to the head, a patient presents with an impaired ability to wrinkle their forehead vertically. Which muscle and its associated nerve are most likely affected?
A patient is unable to close their eyelids completely and has excessive tearing. Which muscle is most likely affected?
A patient is unable to close their eyelids completely and has excessive tearing. Which muscle is most likely affected?
A patient displays an inability to whistle or purse their lips. Which muscle is primarily affected?
A patient displays an inability to whistle or purse their lips. Which muscle is primarily affected?
A person is asked to smile broadly, but only one side of their mouth elevates. Which muscle is most likely affected?
A person is asked to smile broadly, but only one side of their mouth elevates. Which muscle is most likely affected?
Which nerve provides primary motor innervation to the muscles of facial expression?
Which nerve provides primary motor innervation to the muscles of facial expression?
If a lesion affects the facial nerve (CN VII) before it enters the parotid gland, which deficit would you least expect to observe?
If a lesion affects the facial nerve (CN VII) before it enters the parotid gland, which deficit would you least expect to observe?
A lesion of the ophthalmic nerve (V1) would result in loss of sensation in which of the following areas?
A lesion of the ophthalmic nerve (V1) would result in loss of sensation in which of the following areas?
A patient presents with numbness in the cheek and upper lip following a dental procedure. Which nerve was most likely affected?
A patient presents with numbness in the cheek and upper lip following a dental procedure. Which nerve was most likely affected?
What sensation would remain intact if the maxillary nerve (V2) was severed?
What sensation would remain intact if the maxillary nerve (V2) was severed?
A patient reports numbness in the region over the angle of the mandible following a surgical procedure. Which nerve branch is the most likely source of this deficit?
A patient reports numbness in the region over the angle of the mandible following a surgical procedure. Which nerve branch is the most likely source of this deficit?
Which sensation will remain intact if the mandibular nerve (V3) is severed?
Which sensation will remain intact if the mandibular nerve (V3) is severed?
A tumor in the infratemporal fossa compresses the chorda tympani nerve. Which of the following deficits would most likely result from this compression?
A tumor in the infratemporal fossa compresses the chorda tympani nerve. Which of the following deficits would most likely result from this compression?
The auriculotemporal nerve transmits which kind of fibers from the nerve and which structure does it innervate?
The auriculotemporal nerve transmits which kind of fibers from the nerve and which structure does it innervate?
Damage to which of the following is most likely to impair the function of muscles around the mouth in the face?
Damage to which of the following is most likely to impair the function of muscles around the mouth in the face?
A lesion affecting the musculature of the face may lead to several changes. Which of the following is least likely to be effected?
A lesion affecting the musculature of the face may lead to several changes. Which of the following is least likely to be effected?
Regarding the anatomical distinctions between the face and the scalp, what statement is correct?
Regarding the anatomical distinctions between the face and the scalp, what statement is correct?
Which of these arteries is not a division of the external carotid artery?
Which of these arteries is not a division of the external carotid artery?
Which type of nerve fibers found in the facial nerve receive taste senstation from the anterior two thirds of the tongue?
Which type of nerve fibers found in the facial nerve receive taste senstation from the anterior two thirds of the tongue?
The Epicranius muscle can be divided. What are these two parts?
The Epicranius muscle can be divided. What are these two parts?
The nerve fibers innervating which muscles are classified as SVE?
The nerve fibers innervating which muscles are classified as SVE?
After exiting the stylomastoid foramen, which nerve is given?
After exiting the stylomastoid foramen, which nerve is given?
Which of these options does not give sensory innervation to the nose?
Which of these options does not give sensory innervation to the nose?
Each option listed has a part of the face with a corresponding nerve. Given the options which choice is incorrect?
Each option listed has a part of the face with a corresponding nerve. Given the options which choice is incorrect?
Compression of the facial nerve will effect what function?
Compression of the facial nerve will effect what function?
When occipitofrontalis contracts, this motion creates what?
When occipitofrontalis contracts, this motion creates what?
If a patient has issues with their upper lip being elevated, what is a likely source of the problem?
If a patient has issues with their upper lip being elevated, what is a likely source of the problem?
Given the options, which muscle does not assist with moving the mouth?
Given the options, which muscle does not assist with moving the mouth?
What function will remain in tact with damage to the facial nerve?
What function will remain in tact with damage to the facial nerve?
Considering the unique anatomical structure of the scalp, which characteristic poses the greatest challenge for achieving hemostasis during surgical procedures?
Considering the unique anatomical structure of the scalp, which characteristic poses the greatest challenge for achieving hemostasis during surgical procedures?
If a patient has damage in the loose areolar tissue layer of the scalp, which vessels would be most affected?
If a patient has damage in the loose areolar tissue layer of the scalp, which vessels would be most affected?
Which statement accurately contrasts the sensory innervation patterns of the face and scalp?
Which statement accurately contrasts the sensory innervation patterns of the face and scalp?
Following blunt force trauma to the head, a patient exhibits a rapidly expanding hematoma confined to one side of the head, limited by the superior temporal line and the zygomatic arch. Which layer of the scalp is primarily responsible for limiting the spread of this hematoma?
Following blunt force trauma to the head, a patient exhibits a rapidly expanding hematoma confined to one side of the head, limited by the superior temporal line and the zygomatic arch. Which layer of the scalp is primarily responsible for limiting the spread of this hematoma?
Following a surgical procedure, a patient presents with loss of taste sensation in the anterior two-thirds of the tongue and impaired salivation from the submandibular gland. What nerve damage would cause these deficits, if the damage is a single source?
Following a surgical procedure, a patient presents with loss of taste sensation in the anterior two-thirds of the tongue and impaired salivation from the submandibular gland. What nerve damage would cause these deficits, if the damage is a single source?
A patient exhibits paralysis of the frontalis and orbicularis oculi muscles on the same side of their face, along with a loss of taste sensation on the anterior two-thirds of the tongue. Where is the most probable location of a single lesion causing these symptoms?
A patient exhibits paralysis of the frontalis and orbicularis oculi muscles on the same side of their face, along with a loss of taste sensation on the anterior two-thirds of the tongue. Where is the most probable location of a single lesion causing these symptoms?
In a complex reconstructive surgery of the face, a surgeon elevates a myocutaneous flap that includes the platysma muscle. What is the most crucial consideration regarding the nerve supply to this flap to ensure its viability and function?
In a complex reconstructive surgery of the face, a surgeon elevates a myocutaneous flap that includes the platysma muscle. What is the most crucial consideration regarding the nerve supply to this flap to ensure its viability and function?
A patient is unable to wrinkle their forehead, elevate their eyebrows, or tightly close their eyes. Where is the location of the lesion?
A patient is unable to wrinkle their forehead, elevate their eyebrows, or tightly close their eyes. Where is the location of the lesion?
A surgeon needs to transect a branch of the external carotid artery to reduce blood flow to a tumor in the face. Which artery would provide the LEAST amount of impact by transecting it?
A surgeon needs to transect a branch of the external carotid artery to reduce blood flow to a tumor in the face. Which artery would provide the LEAST amount of impact by transecting it?
A patient presents with numbness covering the anterior nasal cavity. What nerve would be involved with the cause?
A patient presents with numbness covering the anterior nasal cavity. What nerve would be involved with the cause?
Which of the lymph nodes would be least likely to receive drainage from the face?
Which of the lymph nodes would be least likely to receive drainage from the face?
Where is the correct location to transect the Facial nerve if the patient's condition is extreme hyper salivation?
Where is the correct location to transect the Facial nerve if the patient's condition is extreme hyper salivation?
If a patient presents with skin pulled taut and difficulty stretching the forehead vertically, which best described the potential problem?
If a patient presents with skin pulled taut and difficulty stretching the forehead vertically, which best described the potential problem?
What separates the muscles of facial expression from deep structures in the face, and what are the implications of this arrangement for surgical procedures?
What separates the muscles of facial expression from deep structures in the face, and what are the implications of this arrangement for surgical procedures?
A patient reports numbness covering the part of the nose. What nerve would be involved with the cause?
A patient reports numbness covering the part of the nose. What nerve would be involved with the cause?
Following a correctly placed injection which paralyzes the mentalis muscle, what specific observable clinical sign would confirm the effectiveness of the block?
Following a correctly placed injection which paralyzes the mentalis muscle, what specific observable clinical sign would confirm the effectiveness of the block?
After a surgical procedure a patient is displaying issues closing and narrowing the mouth as if to whistle. What muscle could be causing this issue if damaged?
After a surgical procedure a patient is displaying issues closing and narrowing the mouth as if to whistle. What muscle could be causing this issue if damaged?
During a surgical approach to the infratemporal fossa, a surgeon identifies the chorda tympani nerve. What key anatomical relationship must the surgeon consider to prevent iatrogenic injury to this nerve?
During a surgical approach to the infratemporal fossa, a surgeon identifies the chorda tympani nerve. What key anatomical relationship must the surgeon consider to prevent iatrogenic injury to this nerve?
If a surgeon performs a surgery to dissect a maxillary nerve before entering the orbit, what openings would need to be factored in?
If a surgeon performs a surgery to dissect a maxillary nerve before entering the orbit, what openings would need to be factored in?
In performing a facial nerve block near the stylomastoid foramen, a physician inadvertently damages a nearby structure. What findings would result?
In performing a facial nerve block near the stylomastoid foramen, a physician inadvertently damages a nearby structure. What findings would result?
During the dissection of muscles around the eyes the lacrimal nerve of the opthalmic nerve must be accounted for. What is the function of the lacrimal nerve?
During the dissection of muscles around the eyes the lacrimal nerve of the opthalmic nerve must be accounted for. What is the function of the lacrimal nerve?
Unlike the scalp, the face lacks a distinct layer of deep cervical fascia, resulting in specific clinical implications. Which of the following is the most critical consequence of this anatomical difference?
Unlike the scalp, the face lacks a distinct layer of deep cervical fascia, resulting in specific clinical implications. Which of the following is the most critical consequence of this anatomical difference?
A patient is diagnosed with a tumor affecting the trigeminal ganglion. Which set of sensory deficits would most likely result from compression of this ganglion?
A patient is diagnosed with a tumor affecting the trigeminal ganglion. Which set of sensory deficits would most likely result from compression of this ganglion?
What is the most significant anatomical reason for possible infection in the face?
What is the most significant anatomical reason for possible infection in the face?
How do the lymphatic drainage patterns of the face differ from those of the scalp, and what are the implications for the spread of superficial infections?
How do the lymphatic drainage patterns of the face differ from those of the scalp, and what are the implications for the spread of superficial infections?
Where is greater possibility of facial damage caused by the trigeminal nerve found?
Where is greater possibility of facial damage caused by the trigeminal nerve found?
Anterior to the auricle the sensory innervation is supplied to what cranial nerve?
Anterior to the auricle the sensory innervation is supplied to what cranial nerve?
Damage to what nerve would hinder elevating the upper lip or nose?
Damage to what nerve would hinder elevating the upper lip or nose?
A patient presents with paralysis of the orbicularis oris and buccinator muscles after a surgery. What other finding would be most likely?
A patient presents with paralysis of the orbicularis oris and buccinator muscles after a surgery. What other finding would be most likely?
If a surgeon dissects the ophthalmic nerve, what openings are most important depending on the target area?
If a surgeon dissects the ophthalmic nerve, what openings are most important depending on the target area?
During a surgery if a person has a facial nerve resection what can be inferred regarding SVE, SVA, GVE, GSA fibers?
During a surgery if a person has a facial nerve resection what can be inferred regarding SVE, SVA, GVE, GSA fibers?
What combination of arterial vessels provides the primary blood supply to the scalp, ensuring a rich collateral circulation?
What combination of arterial vessels provides the primary blood supply to the scalp, ensuring a rich collateral circulation?
The scalp can be described as having 5 layers. Which layer is the MOST superficial?
The scalp can be described as having 5 layers. Which layer is the MOST superficial?
The first three layers of the scalp are firmly attached; in the circumstance of a head injury or surgical opening of the cranium. What is the significance of this layer?
The first three layers of the scalp are firmly attached; in the circumstance of a head injury or surgical opening of the cranium. What is the significance of this layer?
How might the absence of deep fascia within the face impact the spread of an infection originating from a dental abscess?
How might the absence of deep fascia within the face impact the spread of an infection originating from a dental abscess?
Given the anatomical arrangement of the facial and ophthalmic arteries, through what route does the internal carotid artery contribute to the arterial supply of the face?
Given the anatomical arrangement of the facial and ophthalmic arteries, through what route does the internal carotid artery contribute to the arterial supply of the face?
After transection of the facial nerve, what muscles of mastication and sensory functions won't directly related?
After transection of the facial nerve, what muscles of mastication and sensory functions won't directly related?
If a surgeon needs to find the facial nerve in the tissue, they can look for?
If a surgeon needs to find the facial nerve in the tissue, they can look for?
During a surgical procedure in the temporal region, a surgeon encounters a dense, tendinous structure directly beneath the subcutaneous tissue. Which anatomical feature is MOST likely encountered in this location?
During a surgical procedure in the temporal region, a surgeon encounters a dense, tendinous structure directly beneath the subcutaneous tissue. Which anatomical feature is MOST likely encountered in this location?
Where is the correct location for the facial nerve to leave the brain?
Where is the correct location for the facial nerve to leave the brain?
All of the muscles relating to facial expression are the SVE muscles EXCEPT for what?
All of the muscles relating to facial expression are the SVE muscles EXCEPT for what?
Following a meticulous dissection, a medical student correctly identifies the point at which the facial nerve exits the skull. What is the key anatomical feature that confirms this location?
Following a meticulous dissection, a medical student correctly identifies the point at which the facial nerve exits the skull. What is the key anatomical feature that confirms this location?
According to anatomical classifications, where would the Epicranius muscle best fit?
According to anatomical classifications, where would the Epicranius muscle best fit?
A surgeon is planning a facial reconstruction involving extensive undermining of the skin. Given the absence of deep fascia in the face, what surgical maneuvers is critical to prevent complications?
A surgeon is planning a facial reconstruction involving extensive undermining of the skin. Given the absence of deep fascia in the face, what surgical maneuvers is critical to prevent complications?
A patient presents with facial paralysis and loss of taste sensation on the anterior two-thirds of the tongue in addition to dry eyes. Assuming a single lesion is responsible, where is the most likely location of the lesion?
A patient presents with facial paralysis and loss of taste sensation on the anterior two-thirds of the tongue in addition to dry eyes. Assuming a single lesion is responsible, where is the most likely location of the lesion?
During a complex facial surgery, a surgeon encounters a branch of the facial nerve and stimulates it. What muscle would not be affected if stimulated?
During a complex facial surgery, a surgeon encounters a branch of the facial nerve and stimulates it. What muscle would not be affected if stimulated?
A surgeon is planning an incision in the scalp. What of the listed arteries would need to accounted for due to their impact with blood.
A surgeon is planning an incision in the scalp. What of the listed arteries would need to accounted for due to their impact with blood.
A patient presents with a sharp pain in the posterior scalp along with sensory loss of face. What is a likely nerve and root cause?
A patient presents with a sharp pain in the posterior scalp along with sensory loss of face. What is a likely nerve and root cause?
After a motor vehicle accident, a patient presents with forehead asymmetry. What could be the likely case, if it isn't nervous related?
After a motor vehicle accident, a patient presents with forehead asymmetry. What could be the likely case, if it isn't nervous related?
What is significant regarding the location or damage to the facial nerve.
What is significant regarding the location or damage to the facial nerve.
Following a surgical procedure, a patient exhibits difficulty elevating the upper lip and nose, along with sensory loss in the region. Which of the nerve is most likely the source of this deficit?
Following a surgical procedure, a patient exhibits difficulty elevating the upper lip and nose, along with sensory loss in the region. Which of the nerve is most likely the source of this deficit?
A facial injury severs the nerve to the medial pterygoid. What function is compromised?
A facial injury severs the nerve to the medial pterygoid. What function is compromised?
A patient is diagnosed with a tumor affecting the pterygopalatine ganglion. What group of symptoms would be likely?
A patient is diagnosed with a tumor affecting the pterygopalatine ganglion. What group of symptoms would be likely?
What is the result of damage limited to the auriculotemporal nerve?
What is the result of damage limited to the auriculotemporal nerve?
What explains why infections of the face pose a greater risk of intracranial spread compared to scalp infections?
What explains why infections of the face pose a greater risk of intracranial spread compared to scalp infections?
After the removal of a submandibular gland, a patient complains that they no longer have taste sensation. What is the source of this?
After the removal of a submandibular gland, a patient complains that they no longer have taste sensation. What is the source of this?
During surgery in the infratemporal fossa, a surgeon damages the chorda tympani. Which is the most probably immediate result:
During surgery in the infratemporal fossa, a surgeon damages the chorda tympani. Which is the most probably immediate result:
Where is the best location for an incision that is intended to paralyze the depressor anguli oris muscle while minimizing damage:
Where is the best location for an incision that is intended to paralyze the depressor anguli oris muscle while minimizing damage:
If a tumor is found in the cavernous sinus and compresses the ophthalmic nerve (V1), what symptoms would likely be present?
If a tumor is found in the cavernous sinus and compresses the ophthalmic nerve (V1), what symptoms would likely be present?
How does the close embryological association between muscles of facial expression and structures contribute to particular clinical presentation when there is skin graph?
How does the close embryological association between muscles of facial expression and structures contribute to particular clinical presentation when there is skin graph?
If the patient is in a scene from a movie that involves a person being struck in the head and then a large bump forming rapidly. What is wrong about what was shown.
If the patient is in a scene from a movie that involves a person being struck in the head and then a large bump forming rapidly. What is wrong about what was shown.
If a lesion damaged the GSA fibers of the facial nerve. What finding would be most expected?
If a lesion damaged the GSA fibers of the facial nerve. What finding would be most expected?
What would cause facial paralysis, dry mouth, decreased lacrimation, and a loss of the corneal reflex? Where would a lesion likely be?
What would cause facial paralysis, dry mouth, decreased lacrimation, and a loss of the corneal reflex? Where would a lesion likely be?
Flashcards
SCALP definition
SCALP definition
The skin and underlying subcutaneous tissue covering the calvaria between superior nuchal lines and supraorbital margins.
SCALP layers
SCALP layers
Skin, Connective tissue, Aponeurosis, Loose areolar tissue and Pericranium.
Skin (SCALP)
Skin (SCALP)
The outer layer of the SCALP. Hairy and thick with sweat and sebaceous glands. Rich in arteries, veins and lymph vessels
Connective Tissue (SCALP)
Connective Tissue (SCALP)
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Aponeurosis (SCALP)
Aponeurosis (SCALP)
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Loose Areolar Tissue (SCALP)
Loose Areolar Tissue (SCALP)
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Pericranium (SCALP)
Pericranium (SCALP)
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Scalp Proper
Scalp Proper
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Arteries of the SCALP
Arteries of the SCALP
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Branches from external carotid artery
Branches from external carotid artery
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Branches from ophthalmic artery
Branches from ophthalmic artery
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Veins of the SCALP
Veins of the SCALP
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Nerves of the SCALP
Nerves of the SCALP
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Three branches of the fifth crania nerve
Three branches of the fifth crania nerve
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Dorsal rami of the cervical spinal nerves
Dorsal rami of the cervical spinal nerves
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Lymphatics of the SCALP
Lymphatics of the SCALP
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Muscles of the face
Muscles of the face
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Nerve Innervation of facial expression
Nerve Innervation of facial expression
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Epicranius muscle
Epicranius muscle
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Orbicularis oris muscle
Orbicularis oris muscle
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Depressor labii inferioris muscle
Depressor labii inferioris muscle
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Depressor anguli oris muscle
Depressor anguli oris muscle
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Mentalis muscle
Mentalis muscle
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Levator labii superioris muscle
Levator labii superioris muscle
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Levator anguli oris muscle
Levator anguli oris muscle
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Zygomaticus major muscle
Zygomaticus major muscle
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Zygomaticus minor muscle
Zygomaticus minor muscle
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Levator labii superioris alaeque nasi muscle
Levator labii superioris alaeque nasi muscle
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Risorius muscle
Risorius muscle
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Buccinator muscle
Buccinator muscle
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Orbicularis oculi muscle
Orbicularis oculi muscle
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Depressor supercilii muscle
Depressor supercilii muscle
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Corrugator supercilii muscle
Corrugator supercilii muscle
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Nasalis muscle
Nasalis muscle
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Procerus muscle
Procerus muscle
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Depressor septi muscle
Depressor septi muscle
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Platysma muscle
Platysma muscle
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Motor and sensory nerves of the face
Motor and sensory nerves of the face
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SVE fibers (CN VII)
SVE fibers (CN VII)
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SVA fibers (CN VII)
SVA fibers (CN VII)
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GVE fibers (CN VII)
GVE fibers (CN VII)
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GSA fibers (CN VII)
GSA fibers (CN VII)
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Facial nerve pathway
Facial nerve pathway
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Terminal branches of CN VII
Terminal branches of CN VII
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The five terminal branch of CN VII
The five terminal branch of CN VII
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Branching of the facial nerve
Branching of the facial nerve
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Greater petrosal nerve pathway
Greater petrosal nerve pathway
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Nerve to stapedius muscles
Nerve to stapedius muscles
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Chorda tympani
Chorda tympani
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GSA fibers supplys with ?
GSA fibers supplys with ?
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SVE fibers supplys ?
SVE fibers supplys ?
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CN V
CN V
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Ophthalmic nerve (V1) of Trigeminal
Ophthalmic nerve (V1) of Trigeminal
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Maxillary nerve (V2) of Trigeminal
Maxillary nerve (V2) of Trigeminal
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Mandibular nerve (V3) or Trigeminal
Mandibular nerve (V3) or Trigeminal
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Terminal Branches of Ophthalmic
Terminal Branches of Ophthalmic
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Distribution of Trigeminal
Distribution of Trigeminal
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Ophthalmic nerve (V1) pathway
Ophthalmic nerve (V1) pathway
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Maxillary nerve (V2)
Maxillary nerve (V2)
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Sensory Fibers
Sensory Fibers
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Spinous Nerv
Spinous Nerv
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Medial pterygoid
Medial pterygoid
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Arteries in FAcE
Arteries in FAcE
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Anterior
Anterior
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Study Notes
SCALP Definition
- SCALP is the skin and the underlying subcutaneous tissue covering the calvaria
- The SCALP is located between the superior nuchal lines and supraorbital margins
SCALP Layers: Skin
- Hairy and thick
- Contains sweat and sebaceous glands
- It is rich in arteries, veins, and lymph vessels
SCALP Layers: Connective Tissue
- Formed of thick and dense connective tissue
- Contains sensory nerves
- Has a rich vascular supply
SCALP Layers: Aponeurosis
- A dense tendinous structure
- Muscles forming the epicranius muscle attach to this aponeurosis
SCALP Layers: Additional Info
- The first three layers of the SCALP are firmly attached together
- During head injuries and surgical openings of the cranium, these three layers separate as a whole
- These first three layers are collectively referred to as the "scalp proper"
SCALP Layers: Loose Areolar Tissue
- This layer has a spongy structure
- Contains a few amount of arteries and emissary veins
- Emissary veins extend between the superficial veins of the scalp and the diploic veins of the skull bones
SCALP Layers: Pericranium
- The periosteum of the skull bones.
- It is formed of dense connective tissue
Arteries of the SCALP from the external carotid artery
- Occipital artery
- Posterior auricular artery
- Superficial temporal
Arteries of the SCALP from the ophthalmic artery
- Supratrochlear artery
- Supraorbital artery
Veins of the SCALP
- Follow the arteries
- Drain into the occipital, posterior auricular, superficial temporal, supratrochlear, and supraorbital veins
Nerves of the SCALP: Anterior to the auricle
- The sensory innervation is received by the ophthalmic, maxillary, and mandibular nerves (CN V – trigeminal nerve)
Nerves of the SCALP: Posterior to the auricle
- Sensory innervation is supplied by the greater and lesser occipital nerves which are the dorsal rami of the cervical spinal nerves (C2 and C3)
Lymphatics of the SCALP
- Lymhatics drain into the submental, submandibular, parotid, mastoid, retroauricular, and occipital lymph nodes
- Above lymph nodes mainly drain into the deep cervical lymph nodes
FACE characteristics
- There is no deep fascia within the face
- Superficial fascia is thicker in certain regions
Muscles of the Face
- Lie in the subcutaneous tissue
- Extend from bone or facia to skin
- Facial skin movement expresses mood
Facial Expression
- Muscles of facial expression are innervated by the facial nerve (CN VII)
- Nerve fibers innervating the facial muscles are classified as SVE
Epicranius Muscle
- Includes the occipitofrontal and temporoparietal components
- The temporoparietal part is sometimes absent
- The Frontal part elevates the eyebrows when surprised.
- The Occipital part pulls the skin of forehead backwards and stretches the skin
Muscles around the Mouth
- Orbicularis oris: Surrounds the mouth; closes and narrows the mouth as in whistling
- Depressor labii inferioris: Pulls the lower lip inferiorly
- Depressor anguli oris: Depresses the angle of the mouth
- Mentalis: Raises the skin of the chin
- Levator labii superioris: Elevates the upper lip
- Levator anguli oris: Elevates the angle of the mouth
- Zygomaticus major: Elevates the angle of the mouth superolaterally
- Zygomaticus minor: Elevates the angle of the mouth superolaterally
- Levator labii superioris alaeque nasi: Helps to elevate the upper lip
- Risorius: Pulls the corner of the mouth laterally
- Buccinator: Functions in blowing/whistling/sucking; presses the cheek against the tooth and helps in chewing
Muscles around the Orbit
- Orbicularis oculi: -Palpebral part gently closes the eyelid -Orbital part strongly closes the eyelid -.Lacrimal part helps to drain the lacrimal punctum (contains lacrimal fluid)
- Depressor supercilii: Approximates the eyebrows
- Corrugator supercilii: Wrinkles the forehead vertically
Muscles around the Nose
- Nasalis: -The Trangverse part compresses the opening of the nostrils -The Alar part widens them
- Procerus: Draws the eyebrows inferiorly and produce transverse wrinkles over the bridge of the nose
- Depressor septi: Widens the nostrils
Muscle extending to neck
- Platysma
Motor and Sensory Nerves
- The facial nerve
- The trigeminal nerve
Facial Nerve (CN VII): SVE Fibers
- All the muscles of facial expression are innervated
Facial Nerve (CN VII): SVA Fibers
- Receives taste sensation from the anterior two thirds of the tongue
Facial Nerve (CN VII): GVE Fibers
- Supplies parasympathetic motor fibers to the submandibular and sublingual glands, as well as the small salivary glands around the mouth and lacrimal gland
Facial Nerve (CN VII): GSA Fibers
- Receives sensation around the external acoustic meatus
Facial Nerve (CN VII): Route of the facial nerve
- Leaves the CNS and enters the temporal bone through the internal acoustic meatus
- Follows an “S” shaped route inside the temporal bone also note that is is in the facial canal
- Leaves the skull through the stylomastoid foramen and gives its posterior auricular nerve
- Enters into the tissue of the parotid gland
- Gives of its five terminal branches of temporal, zygomatic, buccal, marginal mandibular, and cervical
Facial Nerve (CN VII): Branches at the beginning of the facial canal
- Greater petrosal nerve
Facial Nerve (CN VII): Branches within the facial canal
- Nerve to stapedius muscle
- Chorda tympani
Facial Nerve (CN VII): Branches as it leaves the stylomastoid foramen
- Posterior auricular nerve
- Motor branch which innervates the stylohyoid muscle and the posterior belly of the digastric muscle
- Temporal, Zygomatic, Buccal, Marginal mandibular, and Cervical which all control the muscles of facial expresion
Trigeminal nerve CN V
- GSA fibers supply the sensory innervation of the face
- SVE fibers mainly supply the motor innervation of the muscles of mastication as well some other muscles
Trigeminal nerve CN V Branches
- Includes the Ophtalmic (V1) which is (sensory) and controls the area around orbit
- Includes the Maxillary (V2) which is (sensory) and controls the area around maxilla
- Includes the Mandibular (V3) which is (sensory + motor) and controls the area around mandible (motor fibers innervate the muscles of mastication)
Trigeminal Nerve CN V and Ophtalmic Nerve (V1)
- Sole sensory nerve
- Enters the orbit through the superior orbital fissure
- Supplies branches to the eyeball and superior part of the nasal cavity
- Leaves the orbit to supply the related parts of the face
Ophthalmic Nerve (V1): Three main branches when enterinng orbit
- Frontal nerve
- Lacrimal
- Nasociliary
Trigeminal Nerves: Continuing with Frontal Nerve
- Gives of two branches inside the orbit which include the supraorbital nerve and the supratrochlear nerve
- The supraorbital nerve passes through the supraorbital notch and foramen, and supplies: -the mucosa of the frontal sinus and upper eyelid. -the skin of the forehead and anterior part of the scalp
- The Supratrochlear nerve follows the supraorbital nerve, and supplies the skin on the middle part of the forehead
Trigeminal Nerves: Continuing with Lacrimal Nerve
- Supplies a small area of skin lateral to the upper eyelid, which also related to the conjunctiva
Trigeminal Nerves: Continuing with Nasociliary Nerve
- Gives of three branches which supply the sphenoid sinus, nasal cavity, skin of the nose and medial part of the upper eyelid, as well as the eyeball
- Posterior ethmoidal nerve
- Anterior ethmoidal nerve
- Infratrochlear nerve
- Long ciliary nerve(s)
Trigeminal nerves- Maxillary nerve
- Sole sensory nerve
- Leaves the skull through passing the foramen rotundum and enters the pterygopalatine fossa
- Maxillary nerve passes through the inferior orbital fissure and reaches the orbit
- Last part enters into the infraorbital canal
Maxillary nerve branches
- Zygomatic nerve -Gives of two branches; both branches pass through the foramina of same name and supply sensory innervation to the cheek and temple which include Zygomaticofacial Zygomaticotemporal
- The Nasopalatine nerve Enters the nasal cavity through the sphenopalatine foramen
- Pterygopalatine nerves (two) -Communicates with the pterygopalatine ganglion -They are sensory and pass through the ganglion without synapsing -They leave the ganglion as greater and lesser palatine nerves -Supply parts of nose, palate, tonsil and gingiva
- Infraorbital nerve -Continuation of the maxillary nerve -Maxillary nerve leaves the pterygopalatine fossa through the inferior orbital fissure and becomes the intraorbital nerve Posterior superior alveolar nerve, middle superior alveolar nerve and anterior superior alveolar nerve -Branches supplies maxillary sinus, teeth of the upper jaw and gingiva
Trigeminal nerve: Mandibular nerve (V3)
- Sensory and motor nerve
- Leaves the skull through passing the foramen ovale, and enters the infratemporal fossa to give its branches
Trigeminal nerve: Mandibular nerve functions
- Sensory fibers in the mandibular nerve are distributed to the following regions -Auricle -Extrenal acoustic meatus -Temporal region -Cheek -Skin over the mandible -Part of the tongue and lower jaw teeth
- Motor fibers mainly leave the mandibular nerve at its beginning and innervate the related muscles
Mandibular Nerves
- The branches that remain within in the infratemporal fossa can be divided into three main groups
Mandibular Nerves: First group
- The Branches arising from the trunkinclude -The Spinous nerve -The Medial pterygoid nerve
Mandibular Nerves: Second Group
- The Anterior branches -The Buccal nerve -The Masseteric nerve -The Deep temporal nerves -The Lateral pterygoid nerve
Mandibular Nerves: Third Group
- ThePosterior branches -The Auriculotemporal nerve -The Lingual nerve -The Inferior alveolar nerve
Additional Notes
Buccal, Masseteric, & Lateral pterygoid all innervate muscles with the same name except for the Buccal Nerve. The Buccal Nerve is exclusively sensory and innervates the inner surface of the cheek.
Auriculotemporal Nerve
-Sensory fibers distrubute to external acoustic meatus, temporomandibular joint, auricle and temporal region.
- Parasympathetic fibers from otic ganglion (source is the glossopharyngeal nerve - CN IX) joins this nerve and innervates the parotid gland
Lingual Nerve
- supply sensory innervation of the anterior 2/3 of the tongue.
- Parasympathetic and taste fibers from chorda tympani (br of facial – CN VII) joins this nerve
Inferior Alveolar Nerve
- Enters the mandibular foramen and mandibular canal
- .Before entering the canal, gives two motor branches that supply the anterior belly of digastric and mylohyoid muscle
- its terminal branch is the mental nerve which passes through the mental forame
Arteries of the Face
- Facial artery (br. of external carotid a.)
- Superficial temporal artery (br.of external carotid a.)
- Transverse facial artery (br.of superficial temporal artery)
Veins of the face
- Maxillary vein and superficial temporal vein (unites to form retromandibular vein)
- Retromandibular vein gives of two branches
- posterior branch that unites with the posterior auricular vein forms external jugular vein -anterior branch that unites with the facial vein drains the internal jugular vein
Lymphatics of Face
- All lymphatics dains into the deep cervical lymph nodes.
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