Neck Practice Questions

Q: The infrahyoid muscles are innervated by which of the following?

Ansa cervicalis. **Explanation:** The **infrahyoid muscles** (also known as "strap muscles") include the **Omohyoid, Sternohyoid, Sternothyroid, and Thyrohyoid**. These muscles are primarily responsible for depressing the hyoid bone and larynx during swallowing and speech. 1. **Why Ansa Cervicalis is Correct:** The **Ansa cervicalis** is a loop of nerves from the cervical plexus (C1–C3). It provides motor innervation to three of the four strap muscles: the **Sternohyoid, Sternothyroid, and the inferior belly of the Omohyoid**. While the Thyrohyoid is also an infrahyoid muscle, it is specifically supplied by the C1 nerve fibers traveling with the Hypoglossal nerve. 2. **Why Other Options are Incorrect:** * **Hypoglossal nerve (CN XII):** While the nerve to the thyrohyoid and geniohyoid travels *with* CN XII, these are physiologically C1 fibers. CN XII itself primarily supplies the intrinsic and extrinsic muscles of the tongue. * **Tenth cranial nerve (Vagus):** This nerve supplies the muscles of the pharynx (except stylopharyngeus) and larynx, but not the infrahyoid muscles. * **Ansa subclavia:** This is a sympathetic nerve loop connecting the middle and inferior cervical ganglia, wrapping around the subclavian artery. It has no motor function for skeletal muscles. **High-Yield NEET-PG Pearls:** * **The "C1 Exception":** All infrahyoid muscles are supplied by the Ansa cervicalis **EXCEPT the Thyrohyoid**, which is supplied by C1 via the Hypoglossal nerve. * **Ansa Cervicalis Anatomy:** The superior root (descendens hypoglossi) is derived from **C1**, while the inferior root (descendens cervicalis) is derived from **C2 and C3**. * **Surgical Landmark:** The Ansa cervicalis is typically found embedded in the anterior wall of the **carotid sheath**, superficial to the internal jugular vein.

Q: At what level does the external carotid artery typically divide?

Neck of the mandible. ### Explanation The **External Carotid Artery (ECA)** is one of the two terminal branches of the Common Carotid Artery. It begins at the upper border of the thyroid cartilage (C4 level) and ascends to terminate within the substance of the **parotid gland**. **Why the correct answer is right:** The ECA terminates by dividing into its two terminal branches—the **Maxillary artery** and the **Superficial Temporal artery**. This bifurcation occurs specifically at the level of the **neck of the mandible**, posterior to the ramus. This is a high-yield anatomical landmark frequently tested in surgical and radiological anatomy. **Analysis of incorrect options:** * **A. Angle of the mandible:** This is located inferior to the termination point. The ECA passes deep to the angle of the mandible as it enters the parotid gland but does not divide here. * **C. Oblique line of the thyroid cartilage:** This is a landmark for the attachment of the thyrohyoid, sternothyroid, and inferior constrictor muscles. It is not a vascular bifurcation point. * **D. Lower border of the cricoid cartilage:** This corresponds to the **C6 level**, which marks the beginning of the trachea and esophagus, and the level where the vertebral artery enters the foramen transversarium. **High-Yield Clinical Pearls for NEET-PG:** * **Origin:** The Common Carotid bifurcates at the **upper border of the thyroid cartilage (C4)**. * **Branches:** The ECA gives off **8 branches**. Remember the mnemonic: *"**S**ome **A**ttic **L**ife **F**orce **O**nly **M**akes **P**eople **S**mile"* (Superior thyroid, Ascending pharyngeal, Lingual, Facial, Occipital, Maxillary, Posterior auricular, Superficial temporal). * **Key Distinction:** The ECA is **extracranial** (except for some meningeal branches), while the Internal Carotid Artery (ICA) has no branches in the neck.

Q: Which of the following muscles does NOT form the boundaries of the carotid triangle?

Inferior belly of omohyoid. The **Carotid Triangle** is a significant anatomical space within the anterior triangle of the neck, named for the presence of the carotid sheath and its contents. ### 1. Why the Correct Answer is Right The **Inferior belly of the omohyoid** is the correct answer because it is located in the **posterior triangle** of the neck. It originates from the scapula and attaches to the intermediate tendon, dividing the posterior triangle into the occipital and suvaclavicular (omoclavicular) triangles. It does not participate in forming the boundaries of any subdivision of the anterior triangle. ### 2. Analysis of Boundaries (Incorrect Options) The carotid triangle is bounded by: * **Superiorly:** **Posterior belly of the digastric** muscle (Option A). * **Anteroinferiorly:** **Superior belly of the omohyoid** muscle (Option B). * **Posteriorly:** Anterior border of the **Sternocleidomastoid** (Option D). Since Options A, B, and D form the three sides of the triangle, they are incorrect in the context of this "EXCEPT" question. ### 3. Clinical Pearls & High-Yield Facts * **Contents:** The triangle contains the **Carotid Sheath** (Common Carotid artery, Internal Jugular Vein, and Vagus nerve), the bifurcation of the carotid artery, and the **Ansa Cervicalis** (embedded in the anterior wall of the sheath). * **Carotid Sinus/Body:** The carotid sinus (baroreceptor) and carotid body (chemoreceptor) are located at the level of the upper border of the thyroid cartilage (C4 level) within this triangle. * **Hypoglossal Nerve (CN XII):** This nerve crosses the external and internal carotid arteries within this triangle, making it a vital landmark during carotid endarterectomy.

Q: What structure is superficial to the mylohyoid muscle in an anterior digastric triangle?

Mylohyoid artery and nerve. The **mylohyoid muscle** forms the anatomical floor of the mouth. Understanding its relations is high-yield for NEET-PG, as it separates the sublingual space (superior/deep) from the submandibular space (inferior/superficial). ### **Why the Correct Answer is Right** The **mylohyoid nerve** (a branch of the inferior alveolar nerve) and the **mylohyoid artery** (a branch of the maxillary artery) run in the mylohyoid groove of the mandible. They descend into the submandibular triangle and lie on the **superficial (inferior) surface** of the mylohyoid muscle. They are situated deep to the superficial part of the submandibular gland but superficial to the muscle itself. ### **Analysis of Incorrect Options** * **A. Deep part of submandibular gland:** The submandibular gland is "C-shaped" around the posterior border of the mylohyoid. The **deep part** lies superior/deep to the muscle in the floor of the mouth. * **B. Hypoglossal nerve (CN XII):** This nerve, along with the submandibular duct and the lingual nerve, lies **deep (superior)** to the mylohyoid muscle. * **C. Part of parotid gland:** The parotid gland is located in the retromandibular fossa, posterior to the ramus of the mandible. It does not form a direct relation to the mylohyoid muscle in the digastric triangle. ### **High-Yield NEET-PG Pearls** * **"The Mylohyoid Partition":** Structures **Deep** to mylohyoid (Sublingual space) include the Submandibular duct (Wharton’s), Lingual nerve, Hypoglossal nerve, and Deep part of the submandibular gland. * **Nerve Supply:** The mylohyoid muscle is supplied by the **nerve to mylohyoid** (branch of Mandibular nerve V3), which also supplies the **anterior belly of the digastric**. * **Action:** It elevates the floor of the mouth and the hyoid bone during the first stage of deglutition.

Q: The foramen transversarium transmits which of the following structures?

Vertebral artery. **Explanation:** The **foramen transversarium** is a defining characteristic of cervical vertebrae. It is an opening located within the transverse process of all seven cervical vertebrae (C1–C7). **1. Why the Correct Answer is Right:** The **vertebral artery** (a branch of the first part of the subclavian artery) ascends through the foramina transversaria of the **C1 to C6** vertebrae. It does not typically pass through the foramen of C7, which usually only transmits the accessory vertebral vein. Along with the artery, the **vertebral venous plexus** and **sympathetic nerves** (plexus around the artery) also traverse these openings. **2. Why the Incorrect Options are Wrong:** * **Inferior jugular vein:** This is not a standard anatomical term; the **Internal Jugular Vein** exits the skull via the **jugular foramen** and descends within the carotid sheath, not through the vertebrae. * **Inferior petrosal sinus:** This dural venous sinus exits the skull through the anterior part of the **jugular foramen** to join the internal jugular vein. * **Sigmoid sinus:** This sinus occupies a groove on the internal surface of the mastoid part of the temporal bone and continues as the internal jugular vein after passing through the **jugular foramen**. **3. NEET-PG High-Yield Pearls:** * **C7 Exception:** The foramen transversarium of C7 is the smallest and transmits only the **accessory vertebral vein**, not the vertebral artery. * **Tortuosity:** The vertebral artery follows a winding course (the "suboccipital part") over the posterior arch of the atlas (C1) before entering the foramen magnum. * **Clinical Correlation:** Osteophytes (bone spurs) near the foramen transversarium in cervical spondylosis can compress the vertebral artery, leading to **vertebrobasilar insufficiency** (dizziness/syncope upon turning the neck).

Q: What is true about the left phrenic nerve?

It lies anterior to the anterior scalene muscle.. The phrenic nerve (C3-C5) is the sole motor supply to the diaphragm and a high-yield topic for NEET-PG [1]. ### **Explanation of the Correct Option** **Option A is correct.** In the neck, both the right and left phrenic nerves descend on the **anterior surface of the anterior scalene muscle**, deep to the prevertebral fascia. This is a crucial anatomical landmark used by surgeons and anesthesiologists. ### **Analysis of Incorrect Options** * **Option B:** The phrenic nerve lies **anterior** to the brachial plexus. The brachial plexus emerges between the anterior and middle scalene muscles, whereas the phrenic nerve sits on the anterior surface of the anterior scalene. * **Option C:** The phrenic nerve passes **anterior** to the second part of the subclavian artery. On the left side, it also crosses anterior to the aortic arch. * **Option D:** This is a classic "trap" question. The **phrenic nerve** passes **anterior** to the hilum (root) of the lung, while the **vagus nerve** passes **posterior** to the hilum. ### **High-Yield Clinical Pearls for NEET-PG** * **Mnemonic for Hilum:** **P**hrenic is **P**re-hilar (Anterior); **V**agus is **V**ost-hilar (Posterior - *using 'V' for 'P' phonetically*). * **Referred Pain:** Irritation of the phrenic nerve (e.g., gallbladder disease or subphrenic abscess) causes referred pain to the **tip of the shoulder** (C4 dermatome). * **Left Phrenic Path:** It is unique because it crosses the left surface of the arch of the aorta and the left ventricle to reach the diaphragm. * **Piercing the Diaphragm:** The left phrenic nerve pierces the muscular part of the left dome of the diaphragm, whereas the right phrenic nerve passes through the **caval opening (T8)**.

Q: The movements of which joint permit a person to look to the right and left?

Atlanto-axial. The movement of looking to the right and left (rotation of the head) occurs primarily at the **Atlanto-axial joint**. **1. Why Atlanto-axial is correct:** The atlanto-axial joint is a complex of three synovial joints between the Atlas (C1) and the Axis (C2). The most critical component for rotation is the **median atlanto-axial joint**, which is a **pivot (trochoid) joint**. In this mechanism, the dens (odontoid process) of the axis acts as a pivot around which the atlas rotates, carrying the cranium with it. This joint is responsible for approximately 50% of the total cervical rotation (the "No" movement). **2. Why other options are incorrect:** * **Atlanto-occipital joint:** This is a synovial joint of the **ellipsoid type** between the occipital condyles and the atlas. It primarily permits flexion and extension (the "Yes" movement or nodding). * **C2-C3 and C3-C4:** These are typical cervical vertebrae joints consisting of intervertebral discs and plane-type zygapophysial (facet) joints. While they contribute to the remaining range of neck rotation and lateral flexion, they are not the primary joints for the initial "right and left" pivoting motion. **Clinical Pearls for NEET-PG:** * **The "No" Joint:** Atlanto-axial joint (Rotation). * **The "Yes" Joint:** Atlanto-occipital joint (Flexion/Extension). * **Crucial Ligament:** The **Transverse ligament of the atlas** holds the dens against the atlas; its rupture (e.g., in Rheumatoid Arthritis or Down Syndrome) leads to atlanto-axial subluxation, which can be fatal due to spinal cord compression. * **Alar Ligaments:** These "check ligaments" limit the rotation of the head. Note: The physiological response to such rotational acceleration is processed by the semicircular canals to maintain visual fixation [1].

Q: How many branches does the internal carotid artery have in the neck?

None. **Explanation:** The **Internal Carotid Artery (ICA)** is one of the two terminal branches of the Common Carotid Artery, arising at the level of the upper border of the thyroid cartilage (C3-C4 level). **Why the correct answer is "None":** The ICA is unique because it gives off **no branches in the neck**. It ascends within the carotid sheath, medial to the internal jugular vein and posterior to the external carotid artery, to enter the skull through the carotid canal of the temporal bone. Its branching begins only once it enters the cranial cavity (petrous, cavernous, and cerebral segments). **Analysis of Incorrect Options:** * **Options A, B, and C:** These are incorrect because any branch arising from the carotid system in the neck belongs to the **External Carotid Artery (ECA)**. The ECA has eight branches in the neck (Superior thyroid, Ascending pharyngeal, Lingual, Facial, Occipital, Posterior auricular, Maxillary, and Superficial temporal). **High-Yield Clinical Pearls for NEET-PG:** * **Identification:** In surgical procedures or cadaveric dissections, the ICA is distinguished from the ECA by the **absence of branches** in the neck. * **Carotid Bulb:** The proximal part of the ICA shows a localized dilatation called the **carotid sinus**, which acts as a baroreceptor (innervated by the Glossopharyngeal nerve). * **Course:** The ICA is divided into four main segments: Cervical (no branches), Petrous, Cavernous, and Cerebral. * **First Branch:** The first clinically significant branch of the ICA is usually the **Ophthalmic artery** (arising from the cerebral segment), though small twigs may arise in the petrous and cavernous parts.

Q: Which of the following is NOT a characteristic of a typical cervical vertebra?

Has a large vertebral body. ### Explanation The correct answer is **D. Has a large vertebral body**. **1. Why Option D is correct:** Typical cervical vertebrae (C3–C6) are characterized by having **small, broad, and kidney-shaped vertebral bodies**. The size of the vertebral body increases as one moves down the spinal column to support increasing body weight; therefore, large, massive bodies are a hallmark of **lumbar vertebrae**, not cervical ones. **2. Analysis of Incorrect Options:** * **A. Triangular vertebral canal:** This is a **true** characteristic. The cervical vertebral canal is large and triangular to accommodate the cervical enlargement of the spinal cord. * **B. Foramen transversarium:** This is the **pathognomonic feature** of all cervical vertebrae. These foramina in the transverse processes transmit the vertebral artery (except in C7, where it transmits only accessory vertebral veins), vertebral veins, and sympathetic plexus. * **C. Superior articular facet direction:** In typical cervical vertebrae, the superior articular facets are directed **backwards, upwards, and slightly medially**. This orientation allows for a wide range of flexion, extension, and lateral rotation. **3. High-Yield Clinical Pearls for NEET-PG:** * **Bifid Spinous Process:** Typical cervical vertebrae (C3–C6) have short, bifid spinous processes. C7 (Vertebra Prominens) has a long, non-bifid spine. * **Uncinate Processes:** These are upward projections on the lateral margins of the superior surface of cervical bodies, forming **Joints of Luschka** (uncovertebral joints), which are common sites for osteophyte formation. * **Atypical Cervical Vertebrae:** C1 (Atlas - no body/spine), C2 (Axis - has dens/odontoid process), and C7 (Vertebra Prominens). * **Vertebral Artery Course:** It enters the foramen transversarium at the level of **C6**, not C7.

Question 1

The infrahyoid muscles are innervated by which of the following?

Accepted Answer

Ansa cervicalis

Answer

Hypoglossal nerve

Answer

Tenth cranial nerve

Answer

Ansa subclavia

Question 2

At what level does the external carotid artery typically divide?

Accepted Answer

Neck of the mandible

Answer

Angle of the mandible

Answer

Oblique line of the thyroid cartilage

Answer

Lower border of the cricoid cartilage

Question 3

Which of the following muscles does NOT form the boundaries of the carotid triangle?

Accepted Answer

Inferior belly of omohyoid

Answer

Posterior belly of digastric

Answer

Superior belly of omohyoid

Answer

Sternocleidomastoid

Question 4

What structure is superficial to the mylohyoid muscle in an anterior digastric triangle?

Accepted Answer

Mylohyoid artery and nerve

Answer

Deep part of submandibular gland

Answer

Hypoglossal nerve

Answer

Part of parotid gland

Question 5

The foramen transversarium transmits which of the following structures?

Accepted Answer

Vertebral artery

Answer

Inferior jugular vein

Answer

Inferior petrosal sinus

Answer

Sigmoid sinus

Question 6

What is true about the left phrenic nerve?

Accepted Answer

It lies anterior to the anterior scalene muscle.

Answer

It lies posterior to the brachial plexus.

Answer

It lies posterior to the subclavian artery.

Answer

It lies posterior to the hilum of the left lung.

Question 7

The movements of which joint permit a person to look to the right and left?

Accepted Answer

Atlanto-axial

Answer

Atlanto-occipital

Answer

C2-C3

Answer

C3-C4

Question 8

How many branches does the internal carotid artery have in the neck?

Accepted Answer

None

Answer

One

Answer

Two

Answer

Three

Question 9

Which of the following is NOT a characteristic of a typical cervical vertebra?

Accepted Answer

Has a large vertebral body

Answer

Has a triangular vertebral canal

Answer

Has foramen transversarium

Answer

Superior articular facet is directed backwards and upwards

Question 10

The ligament of Berry, also known as the middle thyroid vein, fixes which anatomical structure?

Accepted Answer

Cricoid cartilage

Answer

Hyoid bone

Answer

Trachea

Answer

Thyroid gland

Neck — MCQs

Neck — MCQs

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