Neck Practice Questions

Q: The vertebral artery passes through the foramen of the transverse processes of which cervical vertebra?

All except the 7th cervical vertebra. **Explanation:** The vertebral artery is a major branch of the first part of the subclavian artery. Its course is divided into four segments, and its relationship with the cervical vertebrae is a high-yield anatomical concept. **1. Why Option D is Correct:** The vertebral artery typically enters the **foramen transversarium** (transverse foramen) of the **6th cervical vertebra (C6)**. It then ascends vertically through the foramina of all subsequent vertebrae above it (C5 to C1). It **does not** pass through the foramen transversarium of the **7th cervical vertebra (C7)**. Although C7 does have a foramen transversarium, it is usually small and transmits only the accessory vertebral vein and sympathetic nerves, not the artery itself. **2. Analysis of Incorrect Options:** * **Option A:** Incorrect because the artery bypasses C7. * **Option B:** Incorrect because it also passes through C1 and C6. * **Option C:** Incorrect because the artery must pass through C1 (Atlas) to enter the foramen magnum and form the basilar artery. **3. Clinical Pearls & High-Yield Facts for NEET-PG:** * **Segments:** * **V1 (Pre-foraminal):** From origin to C6. * **V2 (Foraminal):** From C6 to C1 (the segment described in the question). * **V3 (Atlantic):** Lies in the groove on the superior aspect of the posterior arch of the atlas (within the suboccipital triangle). * **V4 (Intracranial):** Pierces the dura and arachnoid mater to enter the foramen magnum. * **Tortuosity:** The V3 segment is prone to compression during extreme neck rotation, which can lead to Bow Hunter’s Syndrome (vertebrobasilar insufficiency). * **Variation:** In about 5% of individuals, the artery may enter at C4 or C5 instead of C6, but it almost never enters at C7.

Q: The upper border of the thyroid cartilage is at which vertebral level?

C5. The thyroid cartilage is the largest cartilage of the larynx. Its vertebral level is a high-yield anatomical landmark for NEET-PG. The **upper border of the thyroid cartilage** (and the thyroid notch) corresponds to the level of the **C4-C5 intervertebral disc** or the **C4/C5** vertebral level. In most standard anatomical texts, the thyroid cartilage spans from C4 to C5. **Analysis of Options:** * **C5 (Correct):** The upper border of the thyroid cartilage aligns with the C4-C5 level. This is also the critical point where the **Common Carotid Artery bifurcates** into the Internal and External Carotid arteries. * **C2:** This level corresponds to the **Axis** vertebra. The angle of the mandible and the superior cervical ganglion are located near this level, far above the thyroid cartilage. * **C6:** This is the level of the **lower border** of the cricoid cartilage. It marks the transition from the larynx to the trachea and the pharynx to the esophagus. * **T1:** This level corresponds to the apex of the lung and the superior thoracic aperture, well below the laryngeal structures. **High-Yield Clinical Pearls:** 1. **Hyoid Bone:** Located at the **C3** level. 2. **Cricoid Cartilage:** Located at the **C6** level (marks the end of the larynx). 3. **Carotid Bifurcation:** Occurs at the upper border of the thyroid cartilage (**C4-C5**). 4. **Isthmus of Thyroid Gland:** Overlies the **2nd, 3rd, and 4th tracheal rings** [1]. 5. **Emergency Airway:** A cricothyroidotomy is performed through the cricothyroid membrane, located between the thyroid (C4-C5) and cricoid (C6) cartilages.

Q: A lymph node biopsy is taken in the posterior triangle of the neck. What is the most likely nerve to be damaged?

Accessory nerve. **Explanation:** The **Spinal Accessory Nerve (CN XI)** is the most frequently injured nerve during surgical procedures in the posterior triangle of the neck, particularly during lymph node biopsies or radical neck dissections [1]. **Why the Accessory Nerve is the correct answer:** The nerve emerges from the posterior border of the Sternocleidomastoid muscle (at Erb’s point) and runs across the posterior triangle to supply the Trapezius [1]. In this region, it is located very superficially, lying just deep to the **investing layer of deep cervical fascia**. Its superficial position makes it highly vulnerable to accidental transection or traction injury during the excision of enlarged cervical lymph nodes. **Analysis of Incorrect Options:** * **Phrenic Nerve:** This nerve lies deep to the prevertebral fascia, resting on the anterior scalene muscle. It is protected by a thick layer of fascia and is located much deeper than the accessory nerve. * **Upper/Lower Brachial Plexus:** The roots and trunks of the brachial plexus emerge between the anterior and middle scalene muscles in the floor of the posterior triangle [1]. While they can be injured in deep penetrating trauma, they are generally protected by the prevertebral fascia during superficial biopsies. **NEET-PG High-Yield Pearls:** * **Clinical Presentation of Injury:** Drooping of the shoulder, inability to shrug (Trapezius paralysis), and difficulty abducting the arm above 90 degrees [1]. * **Surface Anatomy:** The nerve follows a line connecting a point 1/3rd the way down the posterior border of the Sternocleidomastoid to a point 2/3rd the way down the anterior border of the Trapezius. * **Safety Rule:** Any surgery in the "Carefree area" (upper part of the posterior triangle) must account for the Spinal Accessory Nerve.

Q: Which of the following statements regarding the sensory nerve supply of the pharyngeal mucous membrane is TRUE?

All of the above.. The sensory innervation of the pharynx is derived from the **pharyngeal plexus** and specific cranial nerve branches, following a distinct segmental distribution based on embryological origins. ### **Explanation of Options:** * **Nasopharynx (Option A):** The mucous membrane of the nasopharynx is primarily supplied by the **pharyngeal branch of the maxillary nerve (V2)**, which reaches the area via the pterygopalatine ganglion. * **Oropharynx (Option B):** The **glossopharyngeal nerve (CN IX)** provides sensory fibers to the oropharynx. It also forms the sensory limb of the **gag reflex**. * **Laryngopharynx (Option C):** The sensory supply to the laryngopharynx (hypopharynx) is provided by the **vagus nerve (CN X)**. Specifically, the **internal laryngeal nerve** (a branch of the superior laryngeal nerve) supplies the mucosa down to the level of the vocal folds. Since all three statements accurately describe the segmental sensory distribution, **Option D is correct.** ### **High-Yield NEET-PG Pearls:** 1. **Gag Reflex:** Sensory limb is the **Glossopharyngeal nerve (CN IX)**; Motor limb is the **Vagus nerve (CN X)**. 2. **Killian’s Dehiscence:** A potential gap between the thyropharyngeus and cricopharyngeus parts of the inferior constrictor; it is the most common site for **Zenker’s diverticulum**. 3. **Piriform Fossa:** Internal laryngeal nerve lies just deep to the mucous membrane here; foreign bodies (like fish bones) often lodge in this fossa. 4. **Tonsillar Bed:** The glossopharyngeal nerve is at risk during tonsillectomy as it lies deep to the superior constrictor muscle in the tonsillar fossa.

Q: Level V lymph nodes include:

Posterior triangular lymph nodes. The cervical lymph node classification (Memorial Sloan-Kettering Cancer Center system) divides the neck into six levels. This is a high-yield topic for NEET-PG. ### **Explanation of the Correct Answer** **Level V** nodes are located within the **posterior triangle** of the neck. This region is anatomically bounded anteriorly by the posterior border of the sternocleidomastoid (SCM) muscle, posteriorly by the anterior border of the trapezius muscle, and inferiorly by the clavicle. It includes the spinal accessory nodes, transverse cervical nodes, and supraclavicular nodes. ### **Analysis of Incorrect Options** * **Option A (Pretracheal/Prelaryngeal):** These belong to **Level VI** (Anterior Compartment nodes) [1]. Level VI extends from the hyoid bone superiorly to the suprasternal notch inferiorly [3]. * **Option B (Mediastinal):** These are classified as **Level VII** nodes, located below the suprasternal notch [2]. * **Option C (Lower jugular):** These are **Level IV** nodes. The deep cervical chain (internal jugular nodes) is divided into Level II (Upper), Level III (Middle), and Level IV (Lower), based on their relationship to the hyoid bone and cricoid cartilage [3]. ### **High-Yield Clinical Pearls for NEET-PG** * **Level I:** Submental (Ia) and Submandibular (Ib) nodes. * **Level II, III, IV:** Related to the Internal Jugular Vein. The landmark dividing Level II/III is the **hyoid bone**, and Level III/IV is the **cricoid cartilage** [3]. * **Boundary of Level V:** The posterior border of the SCM is the key landmark. * **Virchow’s Node:** A specific node in the left supraclavicular fossa (part of Level V) that, when enlarged (Troisier’s sign), suggests metastatic abdominal malignancy (e.g., gastric cancer).

Q: What nerve supplies the geniohyoid muscle?

Geniohyoid. The **Geniohyoid** muscle is a suprahyoid muscle located superior to the mylohyoid. Its nerve supply is a high-yield topic because it is an anatomical exception. **Correct Answer: Geniohyoid (Nerve to Geniohyoid)** The geniohyoid is supplied by the **C1 spinal nerve fibers** via the **Hypoglossal nerve (CN XII)**. Although the nerve fibers travel physically with the hypoglossal nerve, they originate from the C1 ventral ramus. This is a unique arrangement shared only with the thyrohyoid muscle. **Analysis of Incorrect Options:** * **Anterior belly of digastric:** This muscle is derived from the first pharyngeal arch and is supplied by the **nerve to mylohyoid** (a branch of the mandibular nerve, V3). * **Posterior belly of digastric:** Derived from the second pharyngeal arch, it is supplied by the **facial nerve (CN VII)**. * **Stapedius:** This is the smallest skeletal muscle in the body, also derived from the second arch and supplied by the **facial nerve (CN VII)**. **High-Yield Clinical Pearls for NEET-PG:** * **C1 via CN XII Rule:** Remember the mnemonic "Two muscles are supplied by C1 via the Hypoglossal nerve: **Geniohyoid** and **Thyrohyoid**." * **Action:** The geniohyoid elevates the hyoid bone and carries it forward; it also helps depress the mandible when the hyoid is fixed. * **Mylohyoid vs. Geniohyoid:** The mylohyoid forms the anatomical floor of the mouth, while the geniohyoid lies immediately superior (deeper) to it. The mylohyoid is supplied by V3, whereas the geniohyoid is supplied by C1.

Q: The thyrocervical trunk is a branch of which part of the subclavian artery?

1st part. The subclavian artery is divided into three parts by the **scalenus anterior muscle**: the first part is medial to the muscle, the second part is posterior (behind) it, and the third part is lateral to it. **1. Why the Correct Answer is Right (1st Part):** The first part of the subclavian artery gives off three major branches, often remembered by the mnemonic **VIT**: * **V:** Vertebral artery * **I:** Internal thoracic artery (Internal mammary) * **T: Thyrocervical trunk** The thyrocervical trunk is a short, wide vessel that further divides into the inferior thyroid, suprascapular, and transverse cervical arteries. **2. Why Incorrect Options are Wrong:** * **2nd Part:** This part typically gives off only one branch: the **costocervical trunk** (which divides into the superior intercostal and deep cervical arteries). *Note: On the left side, the costocervical trunk occasionally arises from the 1st part.* * **3rd Part:** This part is usually branchless, but it may occasionally give rise to the **dorsal scapular artery** (if it does not arise from the transverse cervical artery). **3. Clinical Pearls & High-Yield Facts for NEET-PG:** * **Inferior Thyroid Artery:** A branch of the thyrocervical trunk, it is closely related to the **recurrent laryngeal nerve**. During thyroidectomy, this artery is ligated far from the gland to avoid nerve injury [1]. * **Steal Syndrome:** Obstruction of the subclavian artery proximal to the origin of the vertebral artery (1st part) can lead to Subclavian Steal Syndrome. * **Surface Anatomy:** The subclavian artery becomes the axillary artery at the outer border of the first rib.

Q: A 46-year-old woman presents with a large mass in her lower anterior neck. Ultrasound reveals a benign thyroid tumor. During surgical removal, the superior thyroid artery is identified and used as a landmark to avoid damaging its small companion nerve. Which of the following nerves is most likely to accompany the superior thyroid artery?

External branch of the superior laryngeal nerve. ### Explanation The correct answer is **B. External branch of the superior laryngeal nerve.** **1. Why it is correct:** The **superior thyroid artery (STA)**, a branch of the external carotid artery, descends to the upper pole of the thyroid gland [2]. It is closely accompanied by the **external branch of the superior laryngeal nerve (EBSLN)** [2]. Crucially, as they approach the gland, the nerve lies medial to the artery [2]. To avoid damaging this nerve during a thyroidectomy, surgeons must ligate the superior thyroid artery as **close to the gland** as possible [2]. Damage to the EBSLN results in paralysis of the **cricothyroid muscle**, leading to an inability to tense the vocal cords, manifested clinically as a loss of high-pitched voice and easy vocal fatigue. **2. Why the other options are incorrect:** * **A. Cervical sympathetic trunk:** This lies posterior to the carotid sheath, resting on the prevertebral fascia. It is not a direct companion to the STA. * **C. Inferior root of the ansa cervicalis:** This is formed by fibers from C2 and C3 and is located superficial to or within the carotid sheath, supplying the infrahyoid (strap) muscles. * **D. Internal branch of the superior laryngeal nerve:** This nerve is purely sensory. It accompanies the **superior laryngeal artery** (a branch of the STA) to pierce the thyrohyoid membrane, but it does not descend to the thyroid pole with the main STA. **3. NEET-PG High-Yield Pearls:** * **Superior Thyroid Artery:** Ligate **near** the gland to save the External Laryngeal Nerve [2]. * **Inferior Thyroid Artery:** Ligate **away** from the gland to save the Recurrent Laryngeal Nerve (RLN) [1], [3]. * **Nerve Injury Effects:** * **EBSLN:** Loss of high pitch (the "Amelita Galli-Curci" nerve). * **Unilateral RLN:** Hoarseness of voice. * **Bilateral RLN:** Respiratory distress/stridor (emergency) [3].

Q: The ligament of Berry is formed by which anatomical structure?

Pretracheal layer. The **Ligament of Berry** (also known as the posterior suspensory ligament of the thyroid) is a condensation of the **Pretracheal layer** of the deep cervical fascia. It connects the posteromedial aspect of the thyroid gland’s lobes to the cricoid cartilage and the first two tracheal rings [1]. This attachment is clinically significant as it causes the thyroid gland to move upward during deglutition (swallowing). **Analysis of Options:** * **Option B (Correct):** The pretracheal fascia splits to enclose the thyroid gland. Its thickened posterior part forms the Ligament of Berry, anchoring the gland to the larynx and trachea [1]. * **Option A:** The **Investing layer** surrounds the entire neck and encloses the trapezius and sternocleidomastoid muscles, but it does not form the suspensory ligaments of the thyroid. * **Option C:** The **Prevertebral layer** covers the prevertebral muscles and forms the floor of the posterior triangle; it is located posterior to the retropharyngeal space. * **Option D:** The **Pharyngobasilar fascia** is a fibrous membrane between the muscular and mucous coats of the pharyngeal wall, attaching the pharynx to the base of the skull. **High-Yield Clinical Pearls for NEET-PG:** 1. **Recurrent Laryngeal Nerve (RLN):** The RLN usually passes deep (posterior) to the Ligament of Berry or through its fibers [1]. This makes the nerve highly vulnerable to injury during thyroidectomy when the ligament is being divided [1]. 2. **Thyroid Mobility:** Because the ligament attaches the gland to the respiratory skeleton, any mass within the thyroid (goiter/adenoma) will move superiorly during swallowing—a key diagnostic sign. 3. **Berry’s Ligament vs. Thyroid Capsule:** The ligament is a part of the *false capsule* (pretracheal fascia), not the true fibrous capsule of the gland.

Question 1

The vertebral artery passes through the foramen of the transverse processes of which cervical vertebra?

Accepted Answer

All except the 7th cervical vertebra

Answer

All cervical vertebrae

Answer

2nd to 5th cervical vertebrae

Answer

All except the 1st cervical vertebra

Question 2

The upper border of the thyroid cartilage is at which vertebral level?

Accepted Answer

C5

Answer

C2

Answer

C6

Answer

T1

Question 3

A lymph node biopsy is taken in the posterior triangle of the neck. What is the most likely nerve to be damaged?

Accepted Answer

Accessory nerve

Answer

Phrenic nerve

Answer

Upper brachial plexus

Answer

Lower brachial plexus

Question 4

Which of the following statements regarding the sensory nerve supply of the pharyngeal mucous membrane is TRUE?

Accepted Answer

All of the above.

Answer

Nasopharynx is supplied by the maxillary nerve.

Answer

Glossopharyngeal nerve innervates the oral pharynx.

Answer

Laryngeal pharynx is supplied by the internal laryngeal branch of the vagus nerve.

Question 5

A patient presents with a history of swelling in the submandibular region and is diagnosed with a submandibular abscess. The incision to drain the abscess is placed 1 cm below the base of the mandible. What is the reason for this placement?

Accepted Answer

The marginal mandibular nerve can be injured if the incision is made along the base of the mandible.

Answer

The submandibular gland is located 1 cm below the mandible.

Answer

It is difficult to incise directly along the margin of the mandible.

Answer

To avoid injury to the cervical branch of the facial nerve.

Question 6

Level V lymph nodes include:

Accepted Answer

Posterior triangular lymph nodes

Answer

Pretracheal and prelaryngeal lymph nodes

Answer

Mediastinal lymph nodes

Answer

Lower jugular lymph nodes

Question 7

What nerve supplies the geniohyoid muscle?

Accepted Answer

Geniohyoid

Answer

Anterior belly of digastric

Answer

Posterior belly of digastric

Answer

Stapedius

Question 8

The thyrocervical trunk is a branch of which part of the subclavian artery?

Accepted Answer

1st part

Answer

2nd part

Answer

3rd part

Answer

None of the above

Question 9

A 46-year-old woman presents with a large mass in her lower anterior neck. Ultrasound reveals a benign thyroid tumor. During surgical removal, the superior thyroid artery is identified and used as a landmark to avoid damaging its small companion nerve. Which of the following nerves is most likely to accompany the superior thyroid artery?

Accepted Answer

External branch of the superior laryngeal nerve

Answer

Cervical sympathetic trunk

Answer

Inferior root of the ansa cervicalis

Answer

Internal branch of the superior laryngeal nerve

Question 10

The ligament of Berry is formed by which anatomical structure?

Accepted Answer

Pretracheal layer

Answer

Investing layer of the Deep Cervical fascia

Answer

Prevertebral layer

Answer

Pharyngobasilar fascia

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Neck — MCQs

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