Podcast
Questions and Answers
Which structure is NOT typically enveloped by the pretracheal layer of the deep cervical fascia?
Which structure is NOT typically enveloped by the pretracheal layer of the deep cervical fascia?
- Esophagus
- Trachea
- Vertebral column (correct)
- Infrahyoid muscles
What anatomical structures form the boundaries of the posterior triangle of the neck?
What anatomical structures form the boundaries of the posterior triangle of the neck?
- Trapezius, sternocleidomastoid, clavicle (correct)
- Omohyoid, digastric, sternocleidomastoid
- Sternocleidomastoid, mandible, midline
- Mandible, hyoid bone, sternocleidomastoid
If a surgeon needs to access the retropharyngeal space, which fascial arrangement is MOST relevant to their approach?
If a surgeon needs to access the retropharyngeal space, which fascial arrangement is MOST relevant to their approach?
- Superficial cervical fascia
- Alar fascia joining the carotid sheaths (correct)
- Investing and pretracheal fascia
- Prevertebral fascia enveloping vertebral column
Which of the following BEST describes the significance of the fascial planes of the neck?
Which of the following BEST describes the significance of the fascial planes of the neck?
Which muscle is described as dividing the anterior triangle into the carotid and muscular triangles?
Which muscle is described as dividing the anterior triangle into the carotid and muscular triangles?
A patient exhibits weakness in elevating the hyoid bone and depressing the mandible. Dysfunction of which muscle group is MOST likely?
A patient exhibits weakness in elevating the hyoid bone and depressing the mandible. Dysfunction of which muscle group is MOST likely?
Which of the following structures is NOT typically found within the carotid sheath?
Which of the following structures is NOT typically found within the carotid sheath?
The investing layer of the deep cervical fascia completely envelops which muscles?
The investing layer of the deep cervical fascia completely envelops which muscles?
In which cervical triangle would you MOST likely find the subclavian artery?
In which cervical triangle would you MOST likely find the subclavian artery?
A patient presents with a neck infection. Which fascial layer, if compromised, would MOST likely allow the infection to spread into the mediastinum?
A patient presents with a neck infection. Which fascial layer, if compromised, would MOST likely allow the infection to spread into the mediastinum?
Which muscle is known for its broad, thin sheet-like structure in the superficial fascial plane and is sometimes referred to as the 'shaver's muscle'?
Which muscle is known for its broad, thin sheet-like structure in the superficial fascial plane and is sometimes referred to as the 'shaver's muscle'?
Which triangle of the neck contains the submandibular gland, submandibular lymph nodes, and the hypoglossal nerve?
Which triangle of the neck contains the submandibular gland, submandibular lymph nodes, and the hypoglossal nerve?
Which of the following nerves located in the neck is NOT part of the cervical plexus?
Which of the following nerves located in the neck is NOT part of the cervical plexus?
What is the PRIMARY function of the infrahyoid muscles?
What is the PRIMARY function of the infrahyoid muscles?
Which muscle has fibers that originate along the internal surface of the mandible and insert onto the body of the hyoid bone, forming a support for the base of the tongue?
Which muscle has fibers that originate along the internal surface of the mandible and insert onto the body of the hyoid bone, forming a support for the base of the tongue?
The carotid sinus nerve is contained within the lateral expansions of which fascial layer?
The carotid sinus nerve is contained within the lateral expansions of which fascial layer?
Which of the following BEST describes the function of the sternocleidomastoid muscle?
Which of the following BEST describes the function of the sternocleidomastoid muscle?
In the context of neck anatomy, what is the significance of the 'nerve point of the neck'?
In the context of neck anatomy, what is the significance of the 'nerve point of the neck'?
The anterior belly of which muscle defines the submental triangle?
The anterior belly of which muscle defines the submental triangle?
The carotid sheath contains common and internal carotid arteries, the internal jugular vein, the vagus nerve, carotid sinus nerve and lymph nodes. What fascial layer forms the carotid sheath?
The carotid sheath contains common and internal carotid arteries, the internal jugular vein, the vagus nerve, carotid sinus nerve and lymph nodes. What fascial layer forms the carotid sheath?
Which structure is responsible for dividing the anterior triangle of the neck into the submandibular and submental triangles?
Which structure is responsible for dividing the anterior triangle of the neck into the submandibular and submental triangles?
Which of the following structures is NOT enveloped by the investing layer of deep cervical fascia?
Which of the following structures is NOT enveloped by the investing layer of deep cervical fascia?
What is the PRIMARY role of the superficial cervical fascia?
What is the PRIMARY role of the superficial cervical fascia?
Which layer of the deep cervical fascia is responsible for forming the carotid sheath?
Which layer of the deep cervical fascia is responsible for forming the carotid sheath?
Which of the following nerves is found in the submandibular triangle?
Which of the following nerves is found in the submandibular triangle?
Which of the following is NOT a content of Occipital Triangle?
Which of the following is NOT a content of Occipital Triangle?
Which of the following best describes the PRIMARY function of the prevertebral layer of the deep cervical fascia?
Which of the following best describes the PRIMARY function of the prevertebral layer of the deep cervical fascia?
A surgeon is planning a procedure that requires access to the carotid sheath. Which of the following fascial layers is MOST relevant to this surgical approach?
A surgeon is planning a procedure that requires access to the carotid sheath. Which of the following fascial layers is MOST relevant to this surgical approach?
Which of the following muscles is located internal to the mylohyoid muscle?
Which of the following muscles is located internal to the mylohyoid muscle?
A patient presents with difficulty in elevating the hyoid bone and depressing the mandible. Dysfunction of which muscle is MOST likely the cause?
A patient presents with difficulty in elevating the hyoid bone and depressing the mandible. Dysfunction of which muscle is MOST likely the cause?
Which of the following statements BEST describes the extent of the pretracheal layer of the deep cervical fascia?
Which of the following statements BEST describes the extent of the pretracheal layer of the deep cervical fascia?
Within which cervical triangle is the submental triangle located?
Within which cervical triangle is the submental triangle located?
Which of the following is NOT a component contained within the prevertebral layer's lateral expansions?
Which of the following is NOT a component contained within the prevertebral layer's lateral expansions?
Which muscle is known as the 'shaver's muscle' due to its broad, thin sheet-like structure in the superficial fascial plane?
Which muscle is known as the 'shaver's muscle' due to its broad, thin sheet-like structure in the superficial fascial plane?
Which of the following muscles does NOT contribute to defining the borders of the posterior triangle of the neck?
Which of the following muscles does NOT contribute to defining the borders of the posterior triangle of the neck?
Which of the following best describes the anatomical relationship between the geniohyoid and mylohyoid muscles?
Which of the following best describes the anatomical relationship between the geniohyoid and mylohyoid muscles?
Which of the following best describes the PRIMARY function of the infrahyoid muscles as a group?
Which of the following best describes the PRIMARY function of the infrahyoid muscles as a group?
Given its location, what is the MOST likely role of the alar fascia in the neck?
Given its location, what is the MOST likely role of the alar fascia in the neck?
Which of the following best describes the role of the digastric muscle's fibrous sling?
Which of the following best describes the role of the digastric muscle's fibrous sling?
Which of the following best describes the location and function of the paravertebral muscles?
Which of the following best describes the location and function of the paravertebral muscles?
A patient has a lesion affecting the ansa cervicalis. Which of the following muscle groups would be MOST affected by this lesion?
A patient has a lesion affecting the ansa cervicalis. Which of the following muscle groups would be MOST affected by this lesion?
Which of the following structures is contained within the carotid sheath?
Which of the following structures is contained within the carotid sheath?
Which statement accurately describes the clinical significance of the triangles of the neck?
Which statement accurately describes the clinical significance of the triangles of the neck?
The anterior triangle of the neck is defined by the sternocleidomastoid (SCM) muscle, midline of the neck, and which other structure?
The anterior triangle of the neck is defined by the sternocleidomastoid (SCM) muscle, midline of the neck, and which other structure?
A patient is diagnosed with an infection that has spread to the retropharyngeal space. Which of the following best describes the anatomy that DIRECTLY allows this spread?
A patient is diagnosed with an infection that has spread to the retropharyngeal space. Which of the following best describes the anatomy that DIRECTLY allows this spread?
A previously healthy individual is admitted to the emergency department following a penetrating trauma to the anterior triangle of the neck. Immediate surgical exploration is required. Damage to which of the following structures would be MOST life-threatening?
A previously healthy individual is admitted to the emergency department following a penetrating trauma to the anterior triangle of the neck. Immediate surgical exploration is required. Damage to which of the following structures would be MOST life-threatening?
A 55-year-old male presents with a progressively enlarging mass in the anterior triangle of his neck. Imaging reveals that the mass is located within the carotid sheath. Immunohistochemical analysis confirms the mass originates from cells that support and insulate nerve fibers. Which of the following nerves is MOST likely involved based on its anatomical location related to the mass?
A 55-year-old male presents with a progressively enlarging mass in the anterior triangle of his neck. Imaging reveals that the mass is located within the carotid sheath. Immunohistochemical analysis confirms the mass originates from cells that support and insulate nerve fibers. Which of the following nerves is MOST likely involved based on its anatomical location related to the mass?
During a complex neck dissection, a surgical team must carefully navigate the fascial layers to minimize the risk of damaging critical neurovascular structures. Imagine a scenario where the surgeon must tranverse from the superficial subcutaneous tissue, through the investing layer and pretracheal layer, to reach the thyroid gland. Which of the following structures are they MOST at risk of inadvertently damaging after traversing the investing layer?
During a complex neck dissection, a surgical team must carefully navigate the fascial layers to minimize the risk of damaging critical neurovascular structures. Imagine a scenario where the surgeon must tranverse from the superficial subcutaneous tissue, through the investing layer and pretracheal layer, to reach the thyroid gland. Which of the following structures are they MOST at risk of inadvertently damaging after traversing the investing layer?
The fascial planes of the neck help to ______ the neck.
The fascial planes of the neck help to ______ the neck.
The superficial cervical fascia contains a thin layer of ______ connective tissue.
The superficial cervical fascia contains a thin layer of ______ connective tissue.
The ______ layer of the deep cervical fascia is limited to the anterior portion of the neck.
The ______ layer of the deep cervical fascia is limited to the anterior portion of the neck.
The prevertebral layer of the deep cervical fascia envelops the ______ column and associated muscles.
The prevertebral layer of the deep cervical fascia envelops the ______ column and associated muscles.
The investing cervical layer is the most ______ of the deep layers.
The investing cervical layer is the most ______ of the deep layers.
The ______ muscle is also known as the shaver's muscle.
The ______ muscle is also known as the shaver's muscle.
The sternocleidomastoid muscle contains ______ and clavicular heads.
The sternocleidomastoid muscle contains ______ and clavicular heads.
The trapezius muscle is a ______ muscle of the posterolateral aspect of the neck and thorax.
The trapezius muscle is a ______ muscle of the posterolateral aspect of the neck and thorax.
[Blank] muscles work to elevate the hyoid bone and depress the mandible.
[Blank] muscles work to elevate the hyoid bone and depress the mandible.
The fibers of the ______ muscle originate off a broad origin point along the internal surface of the mandible.
The fibers of the ______ muscle originate off a broad origin point along the internal surface of the mandible.
The ______ muscle is internal to the mylohyoid muscle.
The ______ muscle is internal to the mylohyoid muscle.
The ______ muscle originates from the styloid process to the hyoid bone.
The ______ muscle originates from the styloid process to the hyoid bone.
The digastric muscle's name comes from the presence of 2 muscle ______.
The digastric muscle's name comes from the presence of 2 muscle ______.
[Blank] muscles depress the hyoid bone.
[Blank] muscles depress the hyoid bone.
The ______ muscles are primarily in the posterior triangle of the neck.
The ______ muscles are primarily in the posterior triangle of the neck.
The triangles of the neck are divisions based on ______ borders.
The triangles of the neck are divisions based on ______ borders.
The ______ triangle is defined by the trapezius, sternocleidomastoid, and clavicle.
The ______ triangle is defined by the trapezius, sternocleidomastoid, and clavicle.
The ______ triangle is defined by the sternocleidomastoid, mandible, and midline.
The ______ triangle is defined by the sternocleidomastoid, mandible, and midline.
The ______ muscle divides the posterior triangle into occipital and supraclavicular triangles.
The ______ muscle divides the posterior triangle into occipital and supraclavicular triangles.
The anterior belly of the ______ muscle defines the submental triangle.
The anterior belly of the ______ muscle defines the submental triangle.
The ______ triangle contains the submandibular gland, nodes, hypoglossal and mylohyoid nerves, and facial artery and vein parts.
The ______ triangle contains the submandibular gland, nodes, hypoglossal and mylohyoid nerves, and facial artery and vein parts.
The ______ triangle's main contents are suprahyoid muscles, nodes, and venous system to jugular vein.
The ______ triangle's main contents are suprahyoid muscles, nodes, and venous system to jugular vein.
The ______ triangle includes the carotid sheath, external carotid artery, hypoglossal nerve, and vagus nerve.
The ______ triangle includes the carotid sheath, external carotid artery, hypoglossal nerve, and vagus nerve.
The ______ triangle contains sternothyroid and sternohyoid muscles, thyroid and parathyroid glands.
The ______ triangle contains sternothyroid and sternohyoid muscles, thyroid and parathyroid glands.
The neck contains ______ of the cranial nerves.
The neck contains ______ of the cranial nerves.
The ______ nerve is contained in the carotid sheath of carotid triangle, between the carotid artery and internal jugular vein.
The ______ nerve is contained in the carotid sheath of carotid triangle, between the carotid artery and internal jugular vein.
The ______ nerve is found in occipital triangle; accepts branches from C2-C4.
The ______ nerve is found in occipital triangle; accepts branches from C2-C4.
The ______ nerve is found in submandibular triangle, along with a branch of C1.
The ______ nerve is found in submandibular triangle, along with a branch of C1.
The cervical plexus is formed by spinal nerves ______.
The cervical plexus is formed by spinal nerves ______.
Communication between the head and the thorax/upper limbs occurs through structures that ______.
Communication between the head and the thorax/upper limbs occurs through structures that ______.
Within the superficial cervical fascia, the ______ muscle, also known as the 'shaver's muscle,' presents a broad, thin sheet that diffuses into the subcutaneous fascia of the thorax.
Within the superficial cervical fascia, the ______ muscle, also known as the 'shaver's muscle,' presents a broad, thin sheet that diffuses into the subcutaneous fascia of the thorax.
Originating from a broad area on the internal surface of the mandible, fibers of the ______ muscle insert onto the body of the hyoid bone, with some blending along the midline as the median raphe.
Originating from a broad area on the internal surface of the mandible, fibers of the ______ muscle insert onto the body of the hyoid bone, with some blending along the midline as the median raphe.
Unlike other suprahyoid muscles, the ______ muscle, running anteroposteriorly from the internal surface of the mandible, uniquely sits internal to the mylohyoid muscle.
Unlike other suprahyoid muscles, the ______ muscle, running anteroposteriorly from the internal surface of the mandible, uniquely sits internal to the mylohyoid muscle.
Distinguished by two muscle bellies, the ______ muscle extends from its origin at the mastoid process to its insertion on the mandible, anchored via an intertendon to the hyoid through a fibrous sling from the pretracheal fascia.
Distinguished by two muscle bellies, the ______ muscle extends from its origin at the mastoid process to its insertion on the mandible, anchored via an intertendon to the hyoid through a fibrous sling from the pretracheal fascia.
The carotid sheath, a tubular fascial investment surrounding vessels and nerves, is a product of lateral expansions from the ______ layer and is critical to neck anatomy.
The carotid sheath, a tubular fascial investment surrounding vessels and nerves, is a product of lateral expansions from the ______ layer and is critical to neck anatomy.
Named for its implied directional role, the ______ muscles, are specifically positioned to counter elevation, and are essential for complex neck movements.
Named for its implied directional role, the ______ muscles, are specifically positioned to counter elevation, and are essential for complex neck movements.
Distinguishing it from other regions, the unique organization of the neck's triangles aids in both localizing and structurally ______.
Distinguishing it from other regions, the unique organization of the neck's triangles aids in both localizing and structurally ______.
The superficial cervical fascia plays a critical role of enveloping the entire ______.
The superficial cervical fascia plays a critical role of enveloping the entire ______.
The ______ is located in the posterior triangle and accepts branches from C2-C4.
The ______ is located in the posterior triangle and accepts branches from C2-C4.
Extending from the base of the skull to the root of the neck, the lateral expansions originating from the prevertebral layer contain the common/internal carotid arteries, internal jugular vein, vagus nerve, carotid sinus nerve, and lymph nodes, all fundamental elements within the carotid ______.
Extending from the base of the skull to the root of the neck, the lateral expansions originating from the prevertebral layer contain the common/internal carotid arteries, internal jugular vein, vagus nerve, carotid sinus nerve, and lymph nodes, all fundamental elements within the carotid ______.
Flashcards
Superficial Cervical Fascia
Superficial Cervical Fascia
Thin layer of subcutaneous connective tissue that envelops the entire neck and contains the platysma muscle.
Deep Cervical Fascia
Deep Cervical Fascia
Supports the viscera and forms the carotid sheath; divided into investing, pretracheal, and prevertebral layers.
Investing Cervical Layer
Investing Cervical Layer
Most superficial layer of the deep cervical fascia, enveloping the trapezius and sternocleidomastoid muscles.
Prevertebral Layer
Prevertebral Layer
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Trapezius Muscle
Trapezius Muscle
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Suprahyoid Muscles
Suprahyoid Muscles
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Triangles of the Neck
Triangles of the Neck
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Posterior Triangle
Posterior Triangle
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Contents of Occipital Triangle
Contents of Occipital Triangle
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Contents of Supraclavicular Triangle
Contents of Supraclavicular Triangle
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Anterior Triangle
Anterior Triangle
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Contents of Submandibular Triangle
Contents of Submandibular Triangle
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Contents of Submental Triangle
Contents of Submental Triangle
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Contents of Carotid Triangle
Contents of Carotid Triangle
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Contents of Muscular Triangle
Contents of Muscular Triangle
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Overview of the Neck
Overview of the Neck
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Fascial Planes Function
Fascial Planes Function
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Pretracheal Layer
Pretracheal Layer
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Paravertebral muscles
Paravertebral muscles
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Platysma
Platysma
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Sternocleidomastoid
Sternocleidomastoid
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Mylohyoid muscle
Mylohyoid muscle
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Geniohyoid muscle
Geniohyoid muscle
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Stylohyoid muscle
Stylohyoid muscle
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Digastric muscle
Digastric muscle
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Neck Divisions
Neck Divisions
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Nerve Point
Nerve Point
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Study Notes
Overview
- The neck allows communication between the head, thorax, and upper limbs.
- The neck contains blood vessels, nerves, glands, lymphatics, trachea, and esophagus.
Fascial Planes of the Neck
- Fascial planes compartmentalize the neck and prevent the spread of infection.
- Superficial cervical fascia is a thin layer of subcutaneous connective tissue that envelops the entire neck and contains the platysma.
- Deep cervical fascia supports the viscera and forms the carotid sheath, divided into three layers: investing, pretracheal, and prevertebral.
- Investing cervical layer is the most superficial of the deep layers, enveloping the trapezius and sternocleidomastoid.
- The pretracheal layer is limited to the anterior portion of the neck and extends from the hyoid to the fibrous pericardium.
- The pretracheal layer envelops the infrahyoid muscles, trachea, and esophagus.
- The prevertebral layer envelops the vertebral column and associated muscles.
- Lateral expansions of the prevertebral layer form the carotid sheath, extending from the base of the skull to the root of the neck.
- The carotid sheath contains the common/internal carotid arteries, internal jugular vein, vagus nerve, carotid sinus nerve, and lymph nodes.
- Carotid sheaths are joined by alar fascia, which defines the retropharyngeal space.
- The retropharyngeal space allows movement of the pharynx/esophagus over the vertebral column during swallowing.
Muscles of the Neck
- Superficial muscles include the platysma, sternocleidomastoid, and trapezius.
- The platysma, also known as the shaver's muscle, is a broad, thin sheet in the superficial fascial plane that diffuses into the subcutaneous fascia of the thorax.
- The sternocleidomastoid contains sternal and clavicular heads, inserts on the mastoid process of the head, and is involved in flexion and ipsilateral rotation of the neck.
- The trapezius is a triangular muscle on the posterolateral aspect of the neck and thorax that elevates, retracts, and depresses the scapula, depending on the fibers involved.
- Suprahyoid muscles elevate the hyoid bone and depress the mandible.
- The mylohyoid's fibers originate off a broad origin point along the internal surface of the mandible, insert onto the body of the hyoid bone, and form support for the base of the tongue.
- The geniohyoid muscle is internal to the mylohyoid, running anteroposterior from the internal surface of the mandible to the hyoid bone.
- The stylohyoid runs from the styloid process to the hyoid bone.
- The digastric has two muscle bellies, originating off the mastoid process to insert on the mandible.
- An intertendon between the digastric bellies is anchored to the hyoid through a fibrous sling from the pretracheal fascia; its angle of pull elevates the hyoid and depresses the mandible.
- Infrahyoid muscles depress the hyoid.
- Paravertebral muscles are primarily in the posterior triangle.
Triangles of the Neck
- The triangles of the neck are divisions based on muscular borders that assist in localizing and describing structures.
- The posterior triangle is defined by the trapezius, sternocleidomastoid, and clavicle; the omohyoid divides it into the occipital and supraclavicular triangles.
- The anterior triangle is defined by the sternocleidomastoid, mandible, and midline; the digastric muscle defines the submandibular triangle, the anterior belly of the digastric defines the submental triangle, and the omohyoid muscle divides the remainder into the carotid and muscular triangles.
Triangle Contents
- The occipital triangle contains a part of the external jugular vein, posterior branches of the cervical plexus of nerves, accessory nerve, trunks of the brachial plexus, transverse cervical artery, and cervical lymph nodes.
- The supraclavicular triangle contains subclavian artery (3rd part), part of subclavian vein, suprascapular artery, and supraclavicular lymph nodes.
- The submandibular triangle contains the submandibular gland, submandibular lymph nodes, hypoglossal nerve, mylohyoid nerve, and parts of the facial artery and vein.
- The submental triangle contains suprahyoid muscles, submental lymph nodes, and the venous system to the anterior jugular vein.
- The carotid triangle contains the carotid sheath and contents, external carotid artery, hypoglossal nerve, ansa cervicalis, accessory nerve, thyroid gland, larynx, pharynx, lymph nodes, and branches of the cervical plexus.
- The muscular triangle contains sternothyroid and sternohyoid muscles, thyroid gland, and parathyroid glands.
Nerves of the Neck
- The neck contains three cranial nerves.
- The vagus nerve is contained in the carotid sheath of the carotid triangle, between the carotid artery and internal jugular vein.
- The accessory nerve is found in the occipital triangle and accepts branches from C2-C4.
- The hypoglossal nerve is found in the submandibular triangle, along with a branch of C1.
- The cervical plexus (C1 – C4) has a nerve point of the neck containing the great auricular, lesser occipital, transverse cervical, and supraclavicular nerves.
- The cervical plexus also contains the ansa cervicalis (C1 – C3).
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