Neck — MCQs

Neck Indian Medical PG Practice Questions and MCQs

Question 61: At what level does the common carotid artery divide?

A. Hyoid bone
B. Cricoid cartilage
C. Superior border of thyroid cartilage (Correct Answer)
D. Inferior border of thyroid cartilage

Explanation: The **Common Carotid Artery (CCA)** is a vital vascular structure in the neck. On the right, it originates from the brachiocephalic trunk, and on the left, directly from the aortic arch [1]. **Why the Correct Answer is Right:** The CCA ascends within the carotid sheath and typically bifurcates into the **Internal Carotid Artery (ICA)** and **External Carotid Artery (ECA)** at the level of the **superior border of the thyroid cartilage**. In terms of vertebral levels, this corresponds to the **C3-C4 intervertebral disc** or the body of the **C4 vertebra**. This bifurcation point is clinically significant as it houses the carotid sinus (baroreceptor) and carotid body (chemoreceptor). **Analysis of Incorrect Options:** * **A. Hyoid bone:** This lies at the **C3 level**, slightly superior to the carotid bifurcation. * **B. Cricoid cartilage:** This corresponds to the **C6 level**. This is where the larynx becomes the trachea, the pharynx becomes the esophagus, and it marks the level where the CCA can be compressed against the transverse process of C6 (Chassaignac’s tubercle). * **D. Inferior border of thyroid cartilage:** This is too low (approximately C5 level). The artery is still a single trunk at this point. **High-Yield Clinical Pearls for NEET-PG:** * **Carotid Triangle Boundaries:** Anterior border of SCM, superior belly of omohyoid, and posterior belly of digastric. The bifurcation occurs within this triangle. * **Surface Anatomy:** The bifurcation can be palpated just anterior to the sternocleidomastoid muscle at the level of the laryngeal prominence. * **Internal vs. External:** Remember that the **ICA has no branches in the neck**, whereas the ECA gives off eight branches, starting with the Superior Thyroid Artery.

Question 62: At what level does the external carotid artery typically divide?

A. Angle of the mandible
B. Neck of the mandible (Correct Answer)
C. Oblique line of the thyroid cartilage
D. Lower border of the cricoid cartilage

Explanation: ### 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.

Question 63: Which of the following muscles does NOT form the boundaries of the carotid triangle?

A. Posterior belly of digastric
B. Superior belly of omohyoid
C. Inferior belly of omohyoid (Correct Answer)
D. Sternocleidomastoid

Explanation: 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.

Question 64: The foramen transversarium transmits which of the following structures?

A. Inferior jugular vein
B. Inferior petrosal sinus
C. Sigmoid sinus
D. Vertebral artery (Correct Answer)

Explanation: **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).

Question 65: The internal opening of a branchial fistula is typically located where?

A. Around the third molar
B. Around the second premolar
C. Behind the palatoglossal arch
D. In the fossa of the tonsils (Correct Answer)

Explanation: **Explanation:** The internal opening of a branchial fistula is most commonly associated with a **persistent second branchial cleft**. During embryonic development, the second branchial arch grows downwards to cover the third and fourth arches, forming the cervical sinus of His. If this sinus fails to obliterate and maintains a connection both internally and externally, a complete branchial fistula is formed. **Why the correct answer is right:** The **second branchial pouch** gives rise to the epithelial lining of the **palatine tonsil and the tonsillar fossa**. Therefore, a fistula originating from the second branchial cleft will track internally and open into the **tonsillar fossa** (specifically, near the intratonsillar cleft). The tract typically passes between the internal and external carotid arteries, superior to the glossopharyngeal nerve. **Analysis of incorrect options:** * **A & B (Third molar/Second premolar):** These areas are related to the oral cavity proper and the alveolar processes. They do not correspond to the embryological derivatives of the branchial pouches. * **C (Behind the palatoglossal arch):** The palatoglossal arch (anterior pillar) is formed by the first and second arches. While close, the specific embryological site for the internal opening is the fossa itself, which lies *between* the palatoglossal and palatopharyngeal arches. **High-Yield Clinical Pearls for NEET-PG:** * **Most Common:** 95% of branchial anomalies arise from the **second** branchial apparatus. * **External Opening:** Usually located along the lower 1/3rd of the anterior border of the **sternocleidomastoid muscle**. * **Course:** The second branchial fistula tract always passes **between the internal and external carotid arteries**. * **First Branchial Fistula:** Opens internally into the external auditory canal and externally near the angle of the mandible.

Question 66: Which of the following statements regarding the phrenic nerve is correct?

A. It is a motor nerve to the diaphragm.
B. It arises chiefly from the 3rd cervical nerve and also receives contributions from the 4th and 5th cervical nerves.
C. The nerve runs vertically on the anterior surface of the scalenus anterior muscle. (Correct Answer)
D. It lies anterior to the prevertebral fascia.

Explanation: The phrenic nerve is a critical structure in the neck and thorax, serving as the sole motor supply to the diaphragm. ### **Explanation of the Correct Option** **Option C is correct:** The phrenic nerve descends vertically on the **anterior surface of the scalenus anterior muscle**. It is held in place against the muscle by the **prevertebral fascia** and the transverse cervical and suprascapular arteries, which cross it. This anatomical relationship is a classic landmark in neck dissections. ### **Analysis of Incorrect Options** * **Option A:** While it provides motor supply to the diaphragm, it is a **mixed nerve**, not purely motor. It carries sensory fibers from the mediastinal pleura, fibrous pericardium, and the central part of the diaphragmatic pleura and peritoneum. * **Option B:** The phrenic nerve arises **chiefly from the C4 ventral ramus**, with smaller contributions from C3 and C5 (Mnemonic: *"C3, 4, 5 keep the diaphragm alive"*). * **Option D:** The nerve lies **deep (posterior) to the prevertebral fascia**. This is clinically significant because the nerve is protected during surgeries in the posterior triangle as long as the prevertebral fascia remains intact. ### **High-Yield Clinical Pearls for NEET-PG** * **Surface Marking:** It corresponds to a line joining a point 3.5 cm from the midline at the level of the upper border of the thyroid cartilage to a point on the sternal end of the clavicle. * **Referred Pain:** Irritation of the phrenic nerve (e.g., gallbladder disease or subphrenic abscess) often causes referred pain to the **tip of the shoulder** (C4 dermatome). * **Left vs. Right:** The left phrenic nerve is longer as it has to curve around the apex of the heart.

Question 67: What is the nerve supply to the vocal cords?

A. Internal laryngeal nerve
B. Recurrent laryngeal nerve
C. Superior laryngeal nerve
D. Internal and recurrent laryngeal nerves (Correct Answer)

Explanation: The nerve supply to the vocal cords is dual, involving both sensory and motor components derived from the **Vagus nerve (CN X)**. ### **Explanation of the Correct Answer** The vocal cords represent the transition point in the larynx. The nerve supply is divided based on the position relative to the vocal folds: 1. **Sensory Supply:** The **Internal laryngeal nerve** (a branch of the Superior Laryngeal Nerve) supplies the laryngeal mucosa **above** the level of the vocal folds, including the upper surface of the vocal cords themselves. 2. **Motor Supply:** The **Recurrent laryngeal nerve** supplies all intrinsic muscles of the larynx (except the cricothyroid), including the **Vocalis muscle** and **Thyroarytenoid**, which form the bulk of the vocal cords. It also provides sensory supply **below** the level of the vocal folds. Therefore, both nerves are essential for the functional and sensory integrity of the vocal cords. ### **Analysis of Incorrect Options** * **A & C:** These are incomplete. While the Internal laryngeal nerve (from the Superior laryngeal nerve) provides critical sensory input to prevent aspiration, it does not provide motor innervation to the cords. * **B:** While the Recurrent laryngeal nerve is the "nerve of phonation" (motor), it does not account for the sensory innervation of the glottis and supraglottis. ### **NEET-PG High-Yield Pearls** * **Cricothyroid Muscle:** The only intrinsic laryngeal muscle supplied by the **External laryngeal nerve** (the "Singer’s Nerve"). * **Posterior Cricothyroid:** The only **abductor** of the vocal cords ("Safety muscle of the larynx"). * **Injury Patterns:** * Unilateral Recurrent Laryngeal Nerve injury leads to hoarseness. * Bilateral injury leads to inspiratory stridor and dyspnea as cords assume a paramedian position. * **Semon’s Law:** In progressive lesions of the recurrent laryngeal nerve, abductor fibers are injured before adductor fibers.

Question 68: The movements of which joint permit a person to look to the right and left?

A. Atlanto-occipital
B. Atlanto-axial (Correct Answer)
C. C2-C3
D. C3-C4

Explanation: 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].

Question 69: How many branches does the internal carotid artery have in the neck?

A. One
B. Two
C. Three
D. None (Correct Answer)

Explanation: **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.

Question 70: Which of the following is NOT a characteristic of a typical cervical vertebra?

A. Has a triangular vertebral canal
B. Has foramen transversarium
C. Superior articular facet is directed backwards and upwards
D. Has a large vertebral body (Correct Answer)

Explanation: ### 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.

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Cervical Fascia

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Triangles of the Neck

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Deep Structures of the Neck

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Thyroid and Parathyroid Glands

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Vasculature of the Neck

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Lymphatic Drainage

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Cervical Plexus

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Root of the Neck

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Applied Anatomy and Clinical Correlations

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Surface Anatomy of the Neck

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Neck — MCQs

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