Scalp - HARD Questions

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Questions and Answers

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?

  • 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?

  • Skin and connective tissue. (correct)
  • Pericranium.
  • Aponeurosis.
  • Loose areolar tissue.

How do superficial temporal and supraorbital arteries reach the scalp?

<p>Via branches from both external and internal carotid arteries. (A)</p> Signup and view all the answers

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?

<p>Scalp proper; these layers are firmly attached and typically separated as a single unit during surgery. (B)</p> Signup and view all the answers

What is the key characteristic of the connective tissue layer of the scalp that contributes to significant bleeding when injured?

<p>It has a rich vascular supply where the vessels are held open when lacerated. (C)</p> Signup and view all the answers

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?

<p>Greater occipital nerve (C2). (D)</p> Signup and view all the answers

Occlusion of the supratrochlear artery would directly compromise blood flow to which region of the scalp?

<p>Forehead. (C)</p> Signup and view all the answers

Given the anatomical arrangement of the scalp's vascular supply, which statement best describes the typical approach to controlling bleeding during scalp surgery?

<p>Utilizing sutures or staples to include the skin and connective tissue layers. (B)</p> Signup and view all the answers

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?

<p>The rigid connection of blood vessels within the dense connective tissue. (D)</p> Signup and view all the answers

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?

<p>Supraorbital nerve (V1). (D)</p> Signup and view all the answers

A patient exhibits paralysis of the frontalis muscle, preventing them from raising their eyebrows. Which of the following nerves is most likely affected?

<p>Temporal branch of the facial nerve. (D)</p> Signup and view all the answers

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?

<p>Corrugator supercilii muscle; zygomatic branch of the facial nerve. (A)</p> Signup and view all the answers

A patient is unable to close their eyelids completely and has excessive tearing. Which muscle is most likely affected?

<p>Orbicularis oculi. (A)</p> Signup and view all the answers

A patient displays an inability to whistle or purse their lips. Which muscle is primarily affected?

<p>Orbicularis oris. (D)</p> Signup and view all the answers

A person is asked to smile broadly, but only one side of their mouth elevates. Which muscle is most likely affected?

<p>Zygomaticus major. (C)</p> Signup and view all the answers

Which nerve provides primary motor innervation to the muscles of facial expression?

<p>Facial nerve (CN VII). (B)</p> Signup and view all the answers

If a lesion affects the facial nerve (CN VII) before it enters the parotid gland, which deficit would you least expect to observe?

<p>Decreased salivation from the parotid gland. (C)</p> Signup and view all the answers

A lesion of the ophthalmic nerve (V1) would result in loss of sensation in which of the following areas?

<p>Forehead and upper eyelid. (D)</p> Signup and view all the answers

A patient presents with numbness in the cheek and upper lip following a dental procedure. Which nerve was most likely affected?

<p>Maxillary nerve (V2). (C)</p> Signup and view all the answers

What sensation would remain intact if the maxillary nerve (V2) was severed?

<p>Sensation of the anterior 2/3 of the tongue. (B)</p> Signup and view all the answers

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?

<p>Auriculotemporal nerve. (C)</p> Signup and view all the answers

Which sensation will remain intact if the mandibular nerve (V3) is severed?

<p>Sensation of the skin of the forehead. (A)</p> Signup and view all the answers

A tumor in the infratemporal fossa compresses the chorda tympani nerve. Which of the following deficits would most likely result from this compression?

<p>Loss of taste sensation from the anterior two-thirds of the tongue. (B)</p> Signup and view all the answers

The auriculotemporal nerve transmits which kind of fibers from the nerve and which structure does it innervate?

<p>GVE fibers originate from the otic ganglion and innervates the parotid gland. (B)</p> Signup and view all the answers

Damage to which of the following is most likely to impair the function of muscles around the mouth in the face?

<p>The buccal branch of the facial nerve (CN VII). (D)</p> Signup and view all the answers

A lesion affecting the musculature of the face may lead to several changes. Which of the following is least likely to be effected?

<p>Averting the eye. (D)</p> Signup and view all the answers

Regarding the anatomical distinctions between the face and the scalp, what statement is correct?

<p>The muscles of the face lie in the layer of subcutaneous tissue. (D)</p> Signup and view all the answers

Which of these arteries is not a division of the external carotid artery?

<p>Supraorbital. (B)</p> Signup and view all the answers

Which type of nerve fibers found in the facial nerve receive taste senstation from the anterior two thirds of the tongue?

<p>SVA (C)</p> Signup and view all the answers

The Epicranius muscle can be divided. What are these two parts?

<p>Occipitofrontal and temporoparietal. (A)</p> Signup and view all the answers

The nerve fibers innervating which muscles are classified as SVE?

<p>The facial muscles. (C)</p> Signup and view all the answers

After exiting the stylomastoid foramen, which nerve is given?

<p>Posterior auricular nerve. (C)</p> Signup and view all the answers

Which of these options does not give sensory innervation to the nose?

<p>Zygomaticofacial nerve. (B)</p> Signup and view all the answers

Each option listed has a part of the face with a corresponding nerve. Given the options which choice is incorrect?

<p>Ophthalmic nerve (V1) giving sensation to the teeth. (D)</p> Signup and view all the answers

Compression of the facial nerve will effect what function?

<p>Moving the face. (A)</p> Signup and view all the answers

When occipitofrontalis contracts, this motion creates what?

<p>Backward motion. (C)</p> Signup and view all the answers

If a patient has issues with their upper lip being elevated, what is a likely source of the problem?

<p>Levator labii superioris muscle. (D)</p> Signup and view all the answers

Given the options, which muscle does not assist with moving the mouth?

<p>Lateral pterygoid. (A)</p> Signup and view all the answers

What function will remain in tact with damage to the facial nerve?

<p>Chewing. (A)</p> Signup and view all the answers

Considering the unique anatomical structure of the scalp, which characteristic poses the greatest challenge for achieving hemostasis during surgical procedures?

<p>The dense connective tissue containing arteries that are prone to retracting when lacerated. (A)</p> Signup and view all the answers

If a patient has damage in the loose areolar tissue layer of the scalp, which vessels would be most affected?

<p>Potentially dangerous due to emissary veins. (B)</p> Signup and view all the answers

Which statement accurately contrasts the sensory innervation patterns of the face and scalp?

<p>The face receives sensory innervation from cranial nerve V, while the scalp receives sensory innervation from cranial nerve V and cervical spinal nerves. (A)</p> Signup and view all the answers

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?

<p>The aponeurosis layer, a tough tendinous structure. (C)</p> Signup and view all the answers

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?

<p>The chorda tympani nerve within the infratemporal fossa. (D)</p> Signup and view all the answers

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?

<p>Within the facial canal proximal to the geniculate ganglion. (D)</p> Signup and view all the answers

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?

<p>Maintenance of the cervical branch of the facial nerve to prevent platysma muscle paralysis. (A)</p> Signup and view all the answers

A patient is unable to wrinkle their forehead, elevate their eyebrows, or tightly close their eyes. Where is the location of the lesion?

<p>The temporal branches of the facial nerve. (C)</p> Signup and view all the answers

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?

<p>Supraorbital artery. (C)</p> Signup and view all the answers

A patient presents with numbness covering the anterior nasal cavity. What nerve would be involved with the cause?

<p>Ophthalmic. (C)</p> Signup and view all the answers

Which of the lymph nodes would be least likely to receive drainage from the face?

<p>Retroauricular. (A)</p> Signup and view all the answers

Where is the correct location to transect the Facial nerve if the patient's condition is extreme hyper salivation?

<p>Chorda Tympani. (C)</p> Signup and view all the answers

If a patient presents with skin pulled taut and difficulty stretching the forehead vertically, which best described the potential problem?

<p>Damage to Occipital area of Occipitofrontalis. (A)</p> Signup and view all the answers

What separates the muscles of facial expression from deep structures in the face, and what are the implications of this arrangement for surgical procedures?

<p>The absence of deep fascia, increasing the risk of nerve injury during deep dissections; making blunt dissection difficult (D)</p> Signup and view all the answers

A patient reports numbness covering the part of the nose. What nerve would be involved with the cause?

<p>Ophthalmic. (A)</p> Signup and view all the answers

Following a correctly placed injection which paralyzes the mentalis muscle, what specific observable clinical sign would confirm the effectiveness of the block?

<p>Inability to wrinkle the skin of the chin. (A)</p> Signup and view all the answers

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?

<p>Orbicularis Oris. (A)</p> Signup and view all the answers

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?

<p>Its passage through the petrotympanic fissure and relationship to the temporomandibular joint. (D)</p> Signup and view all the answers

If a surgeon performs a surgery to dissect a maxillary nerve before entering the orbit, what openings would need to be factored in?

<p>Foramen Rotundum and would enter the Pterygopalatine Fossa. (B)</p> Signup and view all the answers

In performing a facial nerve block near the stylomastoid foramen, a physician inadvertently damages a nearby structure. What findings would result?

<p>Diminished sensation of the skin around the ear. (A)</p> Signup and view all the answers

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?

<p>It passes sensation signals of a small area of skin being lateral to the upper eyelid also related part of conjunctiva. (B)</p> Signup and view all the answers

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?

<p>Greater risk of nerve injury. (A)</p> Signup and view all the answers

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?

<p>Numbness of the forehead, cheek, and lower jaw, with sparing of the external ear. (D)</p> Signup and view all the answers

What is the most significant anatomical reason for possible infection in the face?

<p>The veins lack valves, and connects to the cranial cavity. (C)</p> Signup and view all the answers

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?

<p>The face drains to a predictable sequence of regional nodes, whereas the scalp drains directly to the deep cervical nodes; making spread quicker. (B)</p> Signup and view all the answers

Where is greater possibility of facial damage caused by the trigeminal nerve found?

<p>All three branches of the trigeminal nerve are nearly equally commonly affected. (B)</p> Signup and view all the answers

Anterior to the auricle the sensory innervation is supplied to what cranial nerve?

<p>Primarily supplied by the three branches of the fifth cranial nerve (CN V – trigeminal nerve). (B)</p> Signup and view all the answers

Damage to what nerve would hinder elevating the upper lip or nose?

<p>Levator labii superioris alaeque nasi muscle. (A)</p> Signup and view all the answers

A patient presents with paralysis of the orbicularis oris and buccinator muscles after a surgery. What other finding would be most likely?

<p>Problems whistling and sucking. (A)</p> Signup and view all the answers

If a surgeon dissects the ophthalmic nerve, what openings are most important depending on the target area?

<p>Superior Orbital Fissure to reach the superior orbit. (C)</p> Signup and view all the answers

During a surgery if a person has a facial nerve resection what can be inferred regarding SVE, SVA, GVE, GSA fibers?

<p>Most fibers, are classified as SVE. (B)</p> Signup and view all the answers

What combination of arterial vessels provides the primary blood supply to the scalp, ensuring a rich collateral circulation?

<p>Branches from the external carotid and oppthalmic artery (D)</p> Signup and view all the answers

The scalp can be described as having 5 layers. Which layer is the MOST superficial?

<p>Skin. (A)</p> Signup and view all the answers

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?

<p>The three layers are separated as a whole. (D)</p> Signup and view all the answers

How might the absence of deep fascia within the face impact the spread of an infection originating from a dental abscess?

<p>The absence of deep fascia means that there is nothing limiting the spread, leading to more systemic scenarios. (D)</p> Signup and view all the answers

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?

<p>Via the ophthalmic artery branching into supratrochlear and supraorbital arteries. (C)</p> Signup and view all the answers

After transection of the facial nerve, what muscles of mastication and sensory functions won't directly related?

<p>The Trigeminal nerve is the main nerve that functions in the mastication. (B)</p> Signup and view all the answers

If a surgeon needs to find the facial nerve in the tissue, they can look for?

<p>The CN VII nerve. (B)</p> Signup and view all the answers

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?

<p>The aponeurosis (galea aponeurotica), a dense tendinous sheet. (B)</p> Signup and view all the answers

Where is the correct location for the facial nerve to leave the brain?

<p>Leaves the brain and enters the temporal bone through the internal acoustic meatus. (A)</p> Signup and view all the answers

All of the muscles relating to facial expression are the SVE muscles EXCEPT for what?

<p>All the facial muscles are categorized as SVE. (C)</p> Signup and view all the answers

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?

<p>The stylomastoid foramen, located between the styloid and mastoid processes of the temporal bone. (C)</p> Signup and view all the answers

According to anatomical classifications, where would the Epicranius muscle best fit?

<p>Muscle of scalp. (B)</p> Signup and view all the answers

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?

<p>Utilizing meticulous hemostasis and layered closure to prevent hematoma formation. (A)</p> Signup and view all the answers

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?

<p>In the facial canal, proximal to the geniculate ganglion. (C)</p> Signup and view all the answers

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?

<p>The occipitofrontalis muscle. (D)</p> Signup and view all the answers

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.

<p>The superficial temporal artery and the supratrochlear artery. (A)</p> Signup and view all the answers

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?

<p>Occipital nerve originating from C2 and C3. (D)</p> Signup and view all the answers

After a motor vehicle accident, a patient presents with forehead asymmetry. What could be the likely case, if it isn't nervous related?

<p>Damage to the frontalis belly of the occipitofrontalis muscle. (A)</p> Signup and view all the answers

What is significant regarding the location or damage to the facial nerve.

<p>Injury at the stylomastoid foramen solely affects motor function. (A)</p> Signup and view all the answers

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?

<p>Branches of the trigeminal nerve (C)</p> Signup and view all the answers

A facial injury severs the nerve to the medial pterygoid. What function is compromised?

<p>Mouth closing. (D)</p> Signup and view all the answers

A patient is diagnosed with a tumor affecting the pterygopalatine ganglion. What group of symptoms would be likely?

<p>Dry eye due to loss of parasympathetic. (A)</p> Signup and view all the answers

What is the result of damage limited to the auriculotemporal nerve?

<p>Sensory deficit in the external acoustic meatus and TMJ. (C)</p> Signup and view all the answers

What explains why infections of the face pose a greater risk of intracranial spread compared to scalp infections?

<p>Facial veins lack valves and connect directly to the cavernous sinus. (A)</p> Signup and view all the answers

After the removal of a submandibular gland, a patient complains that they no longer have taste sensation. What is the source of this?

<p>The severed Lingual nerve. (A)</p> Signup and view all the answers

During surgery in the infratemporal fossa, a surgeon damages the chorda tympani. Which is the most probably immediate result:

<p>Reduced salivation from the submandibular gland and loss of taste on the anterior tongue. (B)</p> Signup and view all the answers

Where is the best location for an incision that is intended to paralyze the depressor anguli oris muscle while minimizing damage:

<p>Along the inferior border of the mandible. (A)</p> Signup and view all the answers

If a tumor is found in the cavernous sinus and compresses the ophthalmic nerve (V1), what symptoms would likely be present?

<p>Loss of sensation in the forehead and upper eyelid. (C)</p> Signup and view all the answers

How does the close embryological association between muscles of facial expression and structures contribute to particular clinical presentation when there is skin graph?

<p>Restricted facial movement due to graft adherence. (B)</p> Signup and view all the answers

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.

<p>The blood would spread across the head. (B)</p> Signup and view all the answers

If a lesion damaged the GSA fibers of the facial nerve. What finding would be most expected?

<p>Sensory loss from the external acoustic meatus. (C)</p> Signup and view all the answers

What would cause facial paralysis, dry mouth, decreased lacrimation, and a loss of the corneal reflex? Where would a lesion likely be?

<p>Internal acoustic meatus. (B)</p> Signup and view all the answers

Flashcards

SCALP definition

The skin and underlying subcutaneous tissue covering the calvaria between superior nuchal lines and supraorbital margins.

SCALP layers

Skin, Connective tissue, Aponeurosis, Loose areolar tissue and Pericranium.

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)

Formed of thick and dense connective tissue. Contains sensory nerves and has a rich vascular supply

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Aponeurosis (SCALP)

A dense tendinous structure where muscles forming the epicranius muscle attach.

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Loose Areolar Tissue (SCALP)

Has a spongy structure containing a few arteries and emissary veins. Emissary veins extends between the superficial veins of the scalp and the diploic veins of the skull bones.

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Pericranium (SCALP)

This layer is the periosteum of the skull bones, and is formed of dense connective tissue.

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Scalp Proper

The first three layers (skin, connective tissue, and aponeurosis) of the SCALP, firmly attached together.

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Arteries of the SCALP

Branches from external carotid and ophthalmic artery (branch of internal carotid)

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Branches from external carotid artery

Occipital, Posterior auricular and Superficial temporal.

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Branches from ophthalmic artery

Supratrochlear and Supraorbital artery.

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Veins of the SCALP

Occipital, Posterior auricular,Superficial temporal, Supratrochlear and Supraorbital vein.

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Nerves of the SCALP

Anterior to the auricle, the sensory innervation is received by the three branches of the fifth cranial nerve (CN V – trigeminal nerve). Posterior to the auricle sensory innervation is supplied by the dorsal rami of the cervical spinal nerves (C2 and C3)

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Three branches of the fifth crania nerve

Ophthalmic nerve, Maxillary nerve and Mandibular nerve.

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Dorsal rami of the cervical spinal nerves

Greater occipital and Lesser occipital nerve.

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Lymphatics of the SCALP

Lymhatics drain into the following lymph nodes:Submental, Submandibular, Parotid, Mastoid, Retroauricular and Occipital. Above lymph nodes mainly drain into the deep cervical lymph nodes.

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Muscles of the face

Muscles lie in the subcutaneous tissue, extends from bone or facia to skin. By moving the facial skin we express our mood.

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Nerve Innervation of facial expression

Muscles of facial expression are innervated by the CN VII – facial nerve. Nerve fibers innervating the facial muscles are classified as SVE

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Epicranius muscle

Has two parts: Occipitofrontal and temporoparietal. Occipitofrontal has occipital and frontal parts. Temporoparietal part is sometimes absent.

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Orbicularis oris muscle

Surrounds the mouth, Closes and narrows the mouth as in whistling

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Depressor labii inferioris muscle

Pulls the lower lip inferiorly.

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Depressor anguli oris muscle

Depresses the angle of the mouth.

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Mentalis muscle

Raises the skin of the chin.

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Levator labii superioris muscle

Elevates the upper lip

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Levator anguli oris muscle

Elevates the angle of the mouth

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Zygomaticus major muscle

Elevates the angle of the mouth superolaterally

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Zygomaticus minor muscle

Elevates the angle of the mouth superolaterally.

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Levator labii superioris alaeque nasi muscle

Helps to elevate the upper lip.

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Risorius muscle

Pulls the corner of the mouth laterally

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Buccinator muscle

Works in blowing, whistling and sucking. Presses the cheek against the teeth and helps in chewing.

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Orbicularis oculi muscle

Palpebral part gently closes the eyelid, Orbital part strongly closes the eyelid, Lacrimal part help to drain the lacrimal punctum (contains lacrimal fluid)

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Depressor supercilii muscle

Approximates the eyebrows

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Corrugator supercilii muscle

Wrinkles the forehead vertically.

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Nasalis muscle

Transvers part (inf.) compresses the opening of the nostrils , Alar part (sup.) widens them

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Procerus muscle

Draws the eyebrows inferiorly and produce transverse wrinkles over the bridge of the nose.

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Depressor septi muscle

Widens the nostrils.

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Platysma muscle

See muscle extends into neck

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Motor and sensory nerves of the face

Facial and Trigeminal nerve

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SVE fibers (CN VII)

All of the muscles of facial expression are innervated by the facial nerve.

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SVA fibers (CN VII)

Receives taste sensation from the anterior 2/3 of the tongue.

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GVE fibers (CN VII)

Supply parasympathetic motor fibers to the submandibular and sublingual glands, as well as the small salivary glands around the mouth and lacrimal gland.

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GSA fibers (CN VII)

Receives sensation around the external acoustic meatus.

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Facial nerve pathway

Leaves the CNS and enters the temporal bone through the internal acoustic meatus

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Terminal branches of CN VII

Enters into the tissue of the parotid gland and gives of its five terminal branches:

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The five terminal branch of CN VII

Temporal, Zygomatic, Buccal, Marginal mandibular and Cervical.

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Branching of the facial nerve

Greater petrosal nerve, Nerve to stapedius muscle, Chorda tympani and the motor branch

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Greater petrosal nerve pathway

Arise as it enters the facial canal at the level of the geniculate ganglion, which is the sensory ganglion of the facial nerve.

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Nerve to stapedius muscles

Innervates the stapedius muscle, which is one of the two middle ear muscles

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Chorda tympani

Connects to the middle ear, Leaves through Petrotympanic fissure, The last branch inside the facial canal, and Carries taste

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GSA fibers supplys with ?

the sensory innervation of the face

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SVE fibers supplys ?

Mainly supply the motor innervation of the muscles of mastication as well some other muscles

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CN V

is located in the ganglion, in the inner ear. It branches into the ophthalmic, maxillary, and mandibular nerves.

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Ophthalmic nerve (V1) of Trigeminal

(sensory) – around orbit

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Maxillary nerve (V2) of Trigeminal

(sensory) – around maxilla

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Mandibular nerve (V3) or Trigeminal

(sensory + motor) – around mandible.

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Terminal Branches of Ophthalmic

2 branches: Frontal, Lacrimal and Nasociliary.

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Distribution of Trigeminal

Skin and orbit.

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Ophthalmic nerve (V1) pathway

Enters the orbit through the superior orbital fissure. Here supplies branches to the eyeball and superior part of the nasal cavity

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Maxillary nerve (V2)

Gives sensory branch through the pterygopalatine fossa, gives 2 branch-Zygomaticofacial branch,Zygomaticotemporal branch

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Sensory Fibers

Sensory fibers in the manibular nerve are distributed to the following regions like Auricle, External Acoustic meatus and more others and etc..

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Spinous Nerv

It spin through spinous then into the brain side.

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Medial pterygoid

A small part of muscles that control part of brain.

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Arteries in FAcE

Facial nerve and Superficial temporal artery

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Anterior

Anterior branch unites with with the facial vein and drains into the internal jugular vein

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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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