Neck — MCQs

Neck Indian Medical PG Practice Questions and MCQs

Question 241: Which of the following structures does NOT form a boundary of the posterior triangle of the neck?

A. Trapezius
B. Splenius cervicis (Correct Answer)
C. Sternocleidomastoid
D. Clavicle

Explanation: To master the anatomy of the neck for NEET-PG, it is essential to distinguish between the **boundaries** (the walls) and the **floor** of the neck triangles. ### **Why Splenius Cervicis is the Correct Answer** The **Splenius cervicis** (along with the Splenius capitis, Levator scapulae, and Scalenus medius) forms the **floor** of the posterior triangle, not its boundaries. The boundaries are the structural "frames" that define the triangular space, whereas the floor consists of the muscles covered by the prevertebral fascia upon which the contents of the triangle rest. ### **Analysis of Boundaries (Incorrect Options)** The posterior triangle is anatomically defined by the following borders: * **Anterior Boundary (Option C):** Formed by the posterior border of the **Sternocleidomastoid** muscle. * **Posterior Boundary (Option A):** Formed by the anterior border of the **Trapezius** muscle. * **Inferior Boundary/Base (Option D):** Formed by the middle one-third of the **Clavicle**. * **Apex:** Point where the Sternocleidomastoid and Trapezius meet at the superior nuchal line of the occipital bone. * **Roof:** Formed by the investing layer of deep cervical fascia. ### **High-Yield Clinical Pearls for NEET-PG** * **The "Carefree" vs. "Careful" Area:** The posterior triangle is divided by the inferior belly of the omohyoid into the **occipital triangle** (large, superior) and the **supraclavicular/subclavian triangle** (small, inferior). * **Spinal Accessory Nerve (CN XI):** This is the most important structure crossing the posterior triangle. It lies superficial, just beneath the investing fascia, making it highly susceptible to injury during lymph node biopsies. * **Erb’s Point:** Located at the posterior border of the sternocleidomastoid, this is where six nerves emerge (4 cutaneous branches of the cervical plexus, the spinal accessory nerve, and the nerve to subclavius).

Question 242: Which of the following is NOT true regarding the suboccipital triangle?

A. Semispinalis capitis forms the roof of the suboccipital triangle.
B. Rectus capitis posterior major and minor form the boundaries of the suboccipital triangle. (Correct Answer)
C. The posterior atlantooccipital membrane forms the floor of the suboccipital triangle.
D. It contains the third part of the vertebral artery.

Explanation: The suboccipital triangle is a high-yield anatomical region located deep in the upper neck. Understanding its boundaries and contents is essential for NEET-PG. ### **Explanation of the Correct Option** **Option B is the correct answer (the false statement)** because while the **Rectus capitis posterior major** forms the superomedial boundary, the **Rectus capitis posterior minor** does not participate in forming the triangle's boundaries. It lies medial to the major muscle and is part of the suboccipital group but is excluded from the triangle itself. ### **Analysis of Other Options** * **Option A (Roof):** The roof is formed by the **Semispinalis capitis** and the Splenius capitis. This is a true statement. * **Option C (Floor):** The floor is formed by the **posterior atlanto-occipital membrane** and the posterior arch of the atlas (C1). This is a true statement. * **Option D (Contents):** The triangle contains the **third part of the vertebral artery** (resting on the posterior arch of C1) and the **dorsal ramus of C1 (suboccipital nerve)**. This is a true statement. ### **High-Yield NEET-PG Pearls** * **Boundaries:** * *Superomedial:* Rectus capitis posterior major. * *Superolateral:* Obliquus capitis superior. * *Inferolateral:* Obliquus capitis inferior. * **Nerve Supply:** All muscles of the suboccipital triangle are supplied by the **dorsal ramus of C1**. * **Clinical Significance:** The suboccipital nerve has no cutaneous distribution; the **Greater Occipital Nerve (C2)** provides sensation to the back of the scalp and emerges below the inferior oblique muscle.

Question 243: The external opening of the branchial fistula is nearly always situated in the lower third of the neck, near the anterior border of which of the following muscles?

A. Trapezius muscle
B. Sternomastoid muscle (Correct Answer)
C. Masseter muscle
D. All of the above

Explanation: **Explanation:** The correct answer is the **Sternomastoid muscle**. **Anatomical Basis:** A branchial fistula is a congenital anomaly resulting from the failure of the **second branchial cleft** and the **cervical sinus of His** to obliterate. The fistula forms a tract that connects the skin of the neck to the internal pharynx (usually the tonsillar fossa). The external opening is consistently located in the **lower third of the neck**, specifically along the **anterior border of the sternocleidomastoid (SCM) muscle** [1]. This is because the second branchial arch grows downward to cover the third and fourth arches, meeting the epicardial ridge; failure of this fusion leaves a tract along the leading edge of the SCM. **Analysis of Incorrect Options:** * **A. Trapezius muscle:** This muscle forms the posterior boundary of the posterior triangle of the neck. Branchial anomalies are derivatives of the pharyngeal arches and are located anteriorly or laterally, not along the posterior cervical musculature. * **C. Masseter muscle:** This is a muscle of mastication located on the face/mandible. While the first branchial cleft anomalies can occur near the ear or parotid region, the classic "branchial fistula" (second cleft) is a neck pathology far inferior to the masseter. * **D. All of the above:** Incorrect, as the location is specific to the anterior border of the SCM. **High-Yield Clinical Pearls for NEET-PG:** * **Tract Course:** The fistula passes between the internal and external carotid arteries (**Stephens’ Law**), lying superficial to the glossopharyngeal nerve (IX) and hypoglossal nerve (XII). * **Internal Opening:** Most commonly found in the **tonsillar fossa** (supratonsillar fossa). * **Embryology:** 95% of branchial anomalies arise from the **second** branchial cleft [1]. * **Differential Diagnosis:** Unlike a thyroglossal cyst, a branchial fistula/cyst does **not** move with deglutition or protrusion of the tongue.

Question 244: The submandibular gland is roughly J-shaped and situated in which anatomical triangle of the neck?

A. Submental triangle.
B. Digastric triangle. (Correct Answer)
C. Muscular triangle.
D. None of the above.

Explanation: The **submandibular gland** is a large salivary gland that is divided into superficial and deep lobes by the mylohyoid muscle, giving it a characteristic **J-shape**. ### Why the Digastric Triangle is Correct: The **Digastric triangle** (also known as the submandibular triangle) is bounded superiorly by the base of the mandible and inferiorly by the anterior and posterior bellies of the digastric muscle. The superficial part of the submandibular gland occupies nearly the entire volume of this triangle, resting on the mylohyoid and hyoglossus muscles. ### Why Other Options are Incorrect: * **Submental Triangle:** This is a midline triangle bounded by the two anterior bellies of the digastric muscles and the hyoid bone. It contains submental lymph nodes and small veins, but not the submandibular gland. * **Muscular Triangle:** Located in the anterior neck, it contains the infrahyoid (strap) muscles, thyroid gland, and parathyroid glands. It does not house the major salivary glands. ### High-Yield NEET-PG Clinical Pearls: * **Nerve Relations:** The **marginal mandibular branch of the facial nerve** and the **facial vein** pass superficial to the gland, while the **facial artery** grooves its deep surface. * **Wharton’s Duct:** The submandibular duct (Wharton’s duct) emerges from the deep lobe and opens at the sublingual papilla. It is the most common site for **sialolithiasis** (salivary stones) due to its long, upward course and alkaline, calcium-rich secretions. * **Bimanual Palpation:** The gland is best examined by placing one finger in the floor of the mouth and the other externally in the digastric triangle.

Question 245: What muscles form the floor of the posterior triangle of the neck?

A. Semispinalis capitis, levator scapulae, scalenus anterior, scalenus medius
B. Levator scapulae, splenius capitis, scalenus medius, scalenus anterior
C. Semispinalis capitis, scalenus anterior, splenius capitis, sternocleidomastoid
D. Levator scapulae, scalenus posterior, semispinalis capitis, scalenus medius (Correct Answer)

Explanation: ### Explanation The **posterior triangle of the neck** is a space located on the lateral aspect of the neck, bounded anteriorly by the Sternocleidomastoid, posteriorly by the Trapezius, and inferiorly by the clavicle. **1. Why Option D is Correct:** The floor of the posterior triangle is formed by the **prevertebral fascia** covering a specific set of muscles. From superior to inferior, these muscles are: * **Semispinalis capitis** (occasionally present at the apex) * **Splenius capitis** * **Levator scapulae** * **Scalenus medius** * **Scalenus posterior** (the lowest component of the floor) **2. Analysis of Incorrect Options:** * **Option A & B:** These include the **Scalenus anterior**. While the scalenus anterior is a vital landmark in the neck, it is technically **hidden** behind the Sternocleidomastoid muscle and does not form the floor of the posterior triangle. * **Option C:** Includes the **Sternocleidomastoid**, which forms the **anterior boundary** of the triangle, not the floor. **3. High-Yield Clinical Pearls for NEET-PG:** * **The "Floor" Rule:** All muscles forming the floor are covered by the **prevertebral layer** of deep cervical fascia. * **The Accessory Nerve (CN XI):** This nerve crosses the posterior triangle superficially, lying on the levator scapulae. It is the most commonly injured structure during lymph node biopsies in this region. * **Brachial Plexus:** The trunks of the brachial plexus emerge between the **Scalenus anterior** and **Scalenus medius** (the interscalene triangle), but only the Scalenus medius contributes to the visible floor of the posterior triangle. * **Omohyoid:** The inferior belly of the omohyoid crosses the triangle, dividing it into a larger **occipital triangle** above and a smaller **supraclavicular (subclavian) triangle** below.

Question 246: Which nerve supplies the cricothyroid muscle?

A. External laryngeal nerve (Correct Answer)
B. Internal laryngeal nerve
C. Recurrent laryngeal nerve
D. Glossopharyngeal nerve

Explanation: The **cricothyroid muscle** is unique among the intrinsic muscles of the larynx, both in its location (it is the only one situated on the exterior of the larynx) and its nerve supply. ### Why the Correct Answer is Right The **External Laryngeal Nerve (ELN)**, a branch of the Superior Laryngeal Nerve (from the Vagus nerve), provides motor innervation to the cricothyroid muscle. Its primary function is to tense the vocal cords by tilting the thyroid cartilage forward, which increases the distance between the thyroid and arytenoid cartilages. ### Why the Other Options are Wrong * **Internal Laryngeal Nerve:** This is the other branch of the Superior Laryngeal Nerve. It is purely **sensory**, supplying the laryngeal mucosa above the level of the vocal folds. * **Recurrent Laryngeal Nerve (RLN):** This nerve supplies **all other intrinsic muscles** of the larynx [1] (e.g., posterior cricoarytenoid, lateral cricoarytenoid, thyroarytenoid) and provides sensory innervation to the mucosa below the vocal folds. * **Glossopharyngeal Nerve (CN IX):** This nerve provides sensory supply to the oropharynx and motor supply to the stylopharyngeus muscle, but it does not innervate the larynx. ### Clinical Pearls for NEET-PG * **Surgery Link:** During a **thyroidectomy**, the External Laryngeal Nerve is at risk during the ligation of the **Superior Thyroid Artery**, as they run closely together. * **Clinical Presentation:** Injury to the ELN leads to an inability to tense the vocal cords, resulting in a **weak, husky voice** and a loss of the ability to produce high-pitched sounds (often noted by professional singers). * **The "Safety Muscle":** The Posterior Cricoarytenoid is the only abductor of the vocal cords (supplied by RLN) [1], while the Cricothyroid is the primary **tensor**.

Question 247: Which vein does NOT drain into the internal jugular vein?

A. Lingual vein
B. Facial vein
C. Superior thyroid vein
D. Retromandibular vein (Correct Answer)

Explanation: The **Internal Jugular Vein (IJV)** is the major venous channel of the neck, acting as the direct continuation of the sigmoid sinus. Understanding its tributaries is high-yield for NEET-PG. ### **Explanation of the Correct Answer** **D. Retromandibular vein:** This vein is formed by the union of the superficial temporal and maxillary veins. It does not drain directly into the IJV. Instead, it divides into two divisions: 1. **Anterior division:** Joins the facial vein to form the **Common Facial Vein**, which then drains into the IJV. 2. **Posterior division:** Joins the posterior auricular vein to form the **External Jugular Vein (EJV)**. Therefore, the retromandibular vein itself is a precursor to other vessels rather than a direct tributary of the IJV. ### **Analysis of Incorrect Options** * **A. Lingual vein:** Drains the tongue and floor of the mouth; it typically enters the IJV near the level of the greater cornua of the hyoid bone. * **B. Facial vein:** After receiving the anterior division of the retromandibular vein (as the common facial vein), it drains directly into the IJV. * **C. Superior thyroid vein:** Follows the course of the superior thyroid artery and drains into the IJV. ### **NEET-PG Clinical Pearls** * **Mnemonic for IJV Tributaries:** "**Medical Schools Let Fun People Try**" (**M**iddle thyroid, **S**uperior thyroid, **L**ingual, **F**acial, **P**haryngeal, and **T**rigeminal/Inferior Petrosal Sinus). * **Middle Thyroid Vein:** This is a short, wide vein that is a direct tributary of the IJV and is surgically significant during thyroidectomy. * **Inferior Thyroid Vein:** Note that this does **not** drain into the IJV; it drains into the **Left Brachiocephalic Vein**.

Question 248: A superficial incision on the posterior triangle of the neck can lead to injury of which important nerve?

A. Accessory nerve (XI) (Correct Answer)
B. Suprascapular nerve
C. Facial nerve (VII)
D. Hypoglossal nerve (XII)

Explanation: ### Explanation The **Spinal Accessory Nerve (CN XI)** is the most important structure located in the **roof of the posterior triangle**. After exiting the skull and passing through the sternocleidomastoid (SCM), it enters the posterior triangle at the junction of the upper 1/3rd and middle 1/3rd of the posterior border of the SCM. Because it lies immediately deep to the investing layer of deep cervical fascia and is embedded in fatty tissue, it is highly vulnerable to injury during superficial procedures like lymph node biopsies or abscess drainage [1]. **Analysis of Options:** * **Accessory Nerve (XI):** Correct. It is the most superficial nerve in the posterior triangle, crossing it obliquely to supply the trapezius [1]. Injury leads to "drooping of the shoulder" and inability to shrug. * **Suprascapular Nerve:** Incorrect. This nerve arises from the upper trunk of the brachial plexus and lies deep in the lower part of the posterior triangle, protected by the prevertebral fascia. * **Facial Nerve (VII):** Incorrect. It exits the stylomastoid foramen and is primarily located in the parotid region and face, not the posterior triangle. * **Hypoglossal Nerve (XII):** Incorrect. This nerve is located in the anterior triangle (specifically the submandibular and carotid triangles) and does not enter the posterior triangle. **High-Yield Clinical Pearls for NEET-PG:** * **Erb’s Point (Punctum Nervosum):** Located at the midpoint of the posterior border of the SCM; this is where four cutaneous branches of the cervical plexus (Great auricular, Lesser occipital, Transverse cervical, and Supraclavicular) emerge. * **Safe Zone:** The accessory nerve divides the posterior triangle into a "safe" upper half and a "dangerous" lower half. * **Clinical Sign:** Iatrogenic injury to CN XI is the most common cause of trapezius muscle paralysis, resulting in a positive **"Scapular Winging"** (specifically, the lateral displacement of the superior angle) and a constellation of symptoms known as “shoulder syndrome” [1].

Question 249: The Eustachian tube passes between which structures in the neck?

A. Superior and middle constrictors
B. Above the superior constrictor (Correct Answer)
C. Middle and inferior constrictor
D. Below the inferior constrictor

Explanation: ### Explanation The pharyngeal wall is not a continuous sheet of muscle; it contains four distinct gaps (intervals) that allow for the passage of specific structures between the pharynx and the neck. **1. Why the Correct Answer is Right:** The **Eustachian tube** (auditory tube), along with the **levator veli palatini muscle** and the **ascending palatine artery**, passes through the **first gap**. This gap is located **above the superior constrictor muscle**, specifically between the upper border of the muscle and the base of the skull (petrous part of the temporal bone). This space is reinforced by the pharyngobasilar fascia. **2. Analysis of Incorrect Options:** * **Option A (Superior and Middle Constrictors):** This is the **second gap**. It transmits the **stylopharyngeus muscle** and the **glossopharyngeal nerve (CN IX)**. * **Option C (Middle and Inferior Constrictors):** This is the **third gap**. It is pierced by the **internal laryngeal nerve** and the **superior laryngeal artery**. * **Option D (Below the Inferior Constrictor):** This is the **fourth gap**, located between the inferior constrictor and the esophagus. It transmits the **recurrent laryngeal nerve** and the **inferior laryngeal artery**. **3. Clinical Pearls & High-Yield Facts for NEET-PG:** * **Sinus of Morgagni:** The space above the superior constrictor is also known as the Sinus of Morgagni. It is a potential site for the spread of nasopharyngeal carcinoma. * **Passavant’s Ridge:** This is a mucosal ridge formed by the palatopharyngeal sphincter (fibers of the superior constrictor) during swallowing to close the nasopharyngeal isthmus. * **Killian’s Dehiscence:** A weak area between the thyropharyngeal and cricopharyngeal parts of the **inferior constrictor**; it is the most common site for **Zenker’s diverticulum**.

Question 250: The greater cornua of the hyoid bone typically unite with the body of the hyoid bone at which level?

A. C1
B. C3 (Correct Answer)
C. C6
D. T1

Explanation: The **hyoid bone** is a unique, U-shaped bone located in the anterior midline of the neck between the mandible and the thyroid cartilage. It serves as a vital anchor for muscles of the tongue, floor of the mouth, and larynx. **Why C3 is correct:** In a neutral anatomical position, the body of the hyoid bone lies at the level of the **third cervical vertebra (C3)**. The greater cornua (horns) project posteriorly from the lateral ends of the body, maintaining this horizontal plane. This level is a crucial landmark in surface anatomy: it marks the transition where the common carotid artery typically bifurcates into the internal and external carotid arteries. **Why other options are incorrect:** * **C1 (Atlas):** This level corresponds to the base of the skull and the hard palate. The hyoid is situated much lower in the neck. * **C6:** This is a critical landmark for the lower respiratory and digestive tracts. It marks the level of the cricoid cartilage, the start of the trachea, and the junction of the pharynx with the esophagus. * **T1:** This level corresponds to the root of the neck and the apex of the lungs, far below the position of the hyoid bone. **High-Yield Clinical Pearls for NEET-PG:** * **Development:** The body and greater cornua are derived from the **3rd branchial arch**, while the lesser cornua and upper part of the body are derived from the **2nd branchial arch**. * **Unique Feature:** It is the only bone in the human body that **does not articulate** with any other bone; it is suspended by ligaments and muscles. * **Forensic Significance:** A fractured hyoid bone is a classic post-mortem finding strongly suggestive of **strangulation or hanging**.

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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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