Neck Practice Questions

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

Splenius cervicis. 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).

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

Digastric triangle.. 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.

Q: Which nerve supplies the cricothyroid muscle?

External laryngeal nerve. 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**.

Q: Which vein does NOT drain into the internal jugular vein?

Retromandibular vein. 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**.

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

Above the superior constrictor. ### 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**.

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

C3. 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**.

Question 1

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

Accepted Answer

Splenius cervicis

Answer

Trapezius

Answer

Sternocleidomastoid

Answer

Clavicle

Question 2

Which of the following is NOT true regarding the suboccipital triangle?

Accepted Answer

Rectus capitis posterior major and minor form the boundaries of the suboccipital triangle.

Answer

Semispinalis capitis forms the roof of the suboccipital triangle.

Answer

The posterior atlantooccipital membrane forms the floor of the suboccipital triangle.

Answer

It contains the third part of the vertebral artery.

Question 3

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?

Accepted Answer

Sternomastoid muscle

Answer

Trapezius muscle

Answer

Masseter muscle

Answer

All of the above

Question 4

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

Accepted Answer

Digastric triangle.

Answer

Submental triangle.

Answer

Muscular triangle.

Answer

None of the above.

Question 5

What muscles form the floor of the posterior triangle of the neck?

Accepted Answer

Levator scapulae, scalenus posterior, semispinalis capitis, scalenus medius

Answer

Semispinalis capitis, levator scapulae, scalenus anterior, scalenus medius

Answer

Levator scapulae, splenius capitis, scalenus medius, scalenus anterior

Answer

Semispinalis capitis, scalenus anterior, splenius capitis, sternocleidomastoid

Question 6

Which nerve supplies the cricothyroid muscle?

Accepted Answer

External laryngeal nerve

Answer

Internal laryngeal nerve

Answer

Recurrent laryngeal nerve

Answer

Glossopharyngeal nerve

Question 7

Which vein does NOT drain into the internal jugular vein?

Accepted Answer

Retromandibular vein

Answer

Lingual vein

Answer

Facial vein

Answer

Superior thyroid vein

Question 8

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

Accepted Answer

Accessory nerve (XI)

Answer

Suprascapular nerve

Answer

Facial nerve (VII)

Answer

Hypoglossal nerve (XII)

Question 9

The Eustachian tube passes between which structures in the neck?

Accepted Answer

Above the superior constrictor

Answer

Superior and middle constrictors

Answer

Middle and inferior constrictor

Answer

Below the inferior constrictor

Question 10

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

Accepted Answer

C3

Answer

C1

Answer

C6

Answer

T1

Neck — MCQs

Neck — MCQs

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