Neck Practice Questions

Q: What is the correct description of the vertebral artery?

Passes through the C6 foramen transversarium.. ### Explanation The vertebral artery is a vital branch of the **first part of the subclavian artery**. It is traditionally divided into four segments (V1–V4). **Why Option C is Correct:** The vertebral artery (V1 segment) ascends and enters the **foramen transversarium of the C6 vertebra**. It then continues superiorly through the foramina of C5 to C1. Crucially, it **bypasses the C7 foramen transversarium**, which usually only contains small accessory vertebral veins. **Analysis of Incorrect Options:** * **Option A:** While it arises from the first part of the subclavian artery, it lies **medial** to the scalenus anterior muscle, not posterior to it. * **Option B:** The artery actually lies **anterior** to the inferior thyroid artery as it ascends toward the C6 transverse process. * **Option D:** After exiting the C1 foramen transversarium, the artery winds **posteriorly** around the lateral mass of the atlas (lying in the groove on the posterior arch) and then enters the skull through the **foramen magnum**. While this sounds correct, Option C is the most definitive anatomical landmark tested in NEET-PG regarding its entry point into the cervical spine. **High-Yield Clinical Pearls:** * **Suboccipital Triangle:** The V3 segment of the vertebral artery is found in the floor of the suboccipital triangle. * **Basilar Artery:** The two vertebral arteries unite at the lower border of the **pons** to form the basilar artery. * **Wallenberg Syndrome:** Occlusion of the PICA (a branch of the V4 segment) or the vertebral artery itself leads to Lateral Medullary Syndrome.

Q: Which of the following statements is NOT true about the superior laryngeal nerve?

It supplies the larynx below the vocal cords.. The **Superior Laryngeal Nerve (SLN)** is a branch of the Vagus nerve (CN X) that divides into Internal and External branches [1]. Understanding its sensory and motor distribution is high-yield for NEET-PG. ### **Explanation of the Correct Answer** **Option B is False (Correct Answer):** The SLN (specifically the internal laryngeal branch) provides sensory innervation to the larynx **above the level of the vocal cords**. The area **below the vocal cords** is supplied by the **Recurrent Laryngeal Nerve (RLN)** [1]. This anatomical division is a frequent exam focus. ### **Analysis of Other Options** * **Option A:** The internal laryngeal nerve is purely sensory. Blocking this nerve (often done for awake intubations) successfully anesthetizes the laryngeal mucosa down to the level of the vocal folds. * **Options C & D:** These describe the same anatomical pathway. The **Internal Laryngeal Nerve**, along with the superior laryngeal artery, pierces the **thyrohyoid membrane**. This membrane spans the gap **between the thyroid cartilage and the hyoid bone**. ### **NEET-PG High-Yield Pearls** 1. **Internal Laryngeal Nerve:** Sensory above vocal cords; pierces thyrohyoid membrane; mediates the **afferent** limb of the cough reflex [1]. 2. **External Laryngeal Nerve:** Purely motor; supplies only the **Cricothyroid muscle** (the "tenser" of vocal cords). It is closely related to the Superior Thyroid Artery. 3. **Recurrent Laryngeal Nerve:** Sensory **below** vocal cords; motor to all intrinsic muscles of the larynx **except** the cricothyroid [1]. It is closely related to the Inferior Thyroid Artery. 4. **Clinical Correlation:** Injury to the External Laryngeal Nerve during thyroidectomy leads to a weak, husky voice and loss of high-pitched tones [2].

Q: A patient developed recurrent laryngeal nerve palsy during thyroid surgery. Which of the following laryngeal muscles is/are affected?

All. The **Recurrent Laryngeal Nerve (RLN)**, a branch of the Vagus nerve (CN X), provides motor innervation to almost all the intrinsic muscles of the larynx. The only exception is the **Cricothyroid muscle**, which is supplied by the External Laryngeal Nerve. 1. **Why "All" is correct:** The RLN supplies all intrinsic muscles of the larynx except the cricothyroid. This includes: * **Posterior cricoarytenoid:** The only abductor of the vocal cords (the "safety muscle"). * **Lateral cricoarytenoid:** The primary adductor. * **Thyroarytenoid (and Vocalis):** Relaxes the vocal cords. * **Interarytenoid (Transverse and Oblique):** Closes the posterior glottis. [1] Since the RLN supplies all these muscles, a palsy during thyroid surgery will affect all of them. Damage might result in a cord that remains in a midline position or paramedian position. [2] 2. **Analysis of Options:** * **Option A, B, and C:** While each of these muscles is individually affected, they are all supplied by the RLN. Therefore, selecting only one would be incomplete. **High-Yield Clinical Pearls for NEET-PG:** * **The "Safety Muscle":** The Posterior Cricoarytenoid is the only muscle that opens (abducts) the vocal cords. Bilateral RLN injury leads to respiratory distress because the cords cannot abduct. [2] * **Semon’s Law:** In progressive RLN lesions, the abductor fibers (Posterior cricoarytenoid) are more susceptible and paralyzed earlier than the adductor fibers. * **Anatomical Course:** The **Right RLN** hooks around the Right Subclavian Artery, while the **Left RLN** hooks around the Arch of Aorta. [1] * **Thyroid Surgery:** The RLN is most vulnerable near the **Ligament of Berry** and where it crosses the **Inferior Thyroid Artery**. [3]

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

All except the 7th cervical vertebra. ### Explanation **1. Understanding the Vertebral Artery Anatomy** The vertebral artery is the first branch of the first part of the subclavian artery. It is anatomically divided into four segments (V1–V4). The **second segment (V2)** is the "foraminal" portion. It typically enters the **foramen transversarium of the 6th cervical vertebra (C6)** and ascends vertically through the foramina of all subsequent vertebrae above it (C5 to C1). **2. Why Option D is Correct** The **7th cervical vertebra (C7)** does possess a foramen transversarium, but it is typically smaller and transmits only the **accessory vertebral vein**. The vertebral artery itself almost always passes **in front of** the C7 transverse process rather than through its foramen. Therefore, the artery passes through the foramina of C1 through C6, making "All except the 7th cervical vertebra" the correct anatomical description. **3. Analysis of Incorrect Options** * **Option A:** Incorrect because the artery skips the C7 foramen. * **Option B:** Incorrect because it ignores the 1st and 6th vertebrae, which are primary conduits for the artery. * **Option C:** Incorrect because the 1st cervical vertebra (Atlas) is a critical landmark where the artery (V3 segment) curves behind the lateral mass in the suboccipital triangle. **4. NEET-PG High-Yield Clinical Pearls** * **Entry Point:** The most common site of entry for the vertebral artery is the **C6** foramen transversarium. * **V3 Segment:** This segment lies in the **suboccipital triangle** and is prone to compression during extreme rotation of the head. * **Termination:** The two vertebral arteries join at the lower border of the **pons** to form the **Basilar artery**. * **C7 Foramen Content:** Remember, the C7 foramen transversarium is not empty; it contains the **accessory vertebral vein**.

Q: Where is the stellate ganglion located?

Near the lower cervical spine. **Explanation:** The **stellate ganglion** (also known as the cervicothoracic ganglion) is a sympathetic ganglion formed by the fusion of the **inferior cervical ganglion** and the **first thoracic (T1) ganglion**. It is located anterior to the transverse process of the **C7 vertebra** and the neck of the first rib, placing it anatomically **near the lower cervical spine**. It lies medial to the vertebral artery and posterior to the carotid sheath. **Analysis of Options:** * **Options A, B, and C (Cerebellum, Midbrain, Medulla oblongata):** These are all components of the Central Nervous System (CNS) located within the cranial cavity. The stellate ganglion is a part of the Peripheral Nervous System (specifically the autonomic sympathetic chain) and is located in the neck/upper thorax, not the brain [1]. **Clinical Pearls for NEET-PG:** * **Horner’s Syndrome:** Injury to the stellate ganglion (e.g., due to a Pancoast tumor at the lung apex) results in ipsilateral miosis, ptosis, and anhidrosis. * **Stellate Ganglion Block:** This procedure is clinically used to treat chronic pain syndromes (like CRPS Type I), Raynaud’s phenomenon, and hyperhidrosis of the upper limb by interrupting sympathetic outflow. * **Relations:** It is situated in the **Scalenovertebral triangle** (Triangle of the Vertebral Artery). * **Sibson’s Fascia:** The ganglion lies just posterior to the cervical pleura (suprapleural membrane) [2].

Q: Which nerve supplies the sternocleidomastoid muscle?

Spinal accessory nerve. The **Spinal Accessory Nerve (CN XI)** is the motor supply to two major muscles of the neck: the **sternocleidomastoid (SCM)** and the **trapezius**. Specifically, it is the spinal part of the nerve (arising from C1-C5 segments) that enters the skull via the foramen magnum and exits through the jugular foramen to reach these muscles. While the SCM also receives sensory fibers from the cervical plexus (C2, C3) for proprioception, the primary motor drive is provided by CN XI [1]. **Analysis of Incorrect Options:** * **Vagus Nerve (CN X):** Supplies the muscles of the pharynx (except stylopharyngeus), larynx, and soft palate (except tensor veli palatini). It does not provide motor innervation to the SCM. * **Marginal Mandibular Branch of Facial Nerve:** This nerve supplies the muscles of the lower lip and chin (e.g., depressor anguli oris). While it runs superficial to the upper part of the SCM, it does not innervate it. * **None of the above:** Incorrect, as the spinal accessory nerve is the well-established motor supply. **High-Yield Clinical Pearls for NEET-PG:** * **Surface Anatomy:** The spinal accessory nerve is found in the **posterior triangle** of the neck, lying on the levator scapulae muscle. It is highly vulnerable to injury during lymph node biopsies in this region. * **Clinical Testing:** Injury to CN XI results in weakness in turning the head to the **opposite side** (SCM function) and drooping of the shoulder with an inability to shrug (Trapezius function) [1]. * **Torticolis (Wry Neck):** Often involves permanent contraction or fibrosis of the SCM, leading to a tilted head position.

Q: Which of the following is NOT an elastic laryngeal cartilage?

Thyroid. ### Explanation The laryngeal cartilages are classified into two types based on the histological nature of their matrix: **Hyaline** and **Elastic**. **1. Why Thyroid is the Correct Answer:** The **Thyroid cartilage** is composed of **hyaline cartilage**. Hyaline cartilages have a tendency to undergo **calcification and ossification** as a person ages (usually starting after age 25). Other hyaline cartilages in the larynx include the **Cricoid** and the **base of the Arytenoid** cartilages. **2. Analysis of Incorrect Options (Elastic Cartilages):** The elastic cartilages of the larynx contain abundant elastic fibers, providing flexibility. Crucially, **elastic cartilages do not calcify with age.** * **Epiglottis (Option A):** A leaf-shaped elastic cartilage that prevents food from entering the larynx. * **Corniculate (Option B):** Small, conical elastic nodules situated atop the arytenoid cartilages. * **Cuneiform (Option C):** Rod-shaped elastic cartilages located within the aryepiglottic folds. * *Note:* The **vocal process** and **apex** of the Arytenoid are also elastic. **3. NEET-PG High-Yield Pearls:** * **Mnemonic for Elastic Cartilages:** "**E**very **C**loud **C**ontains **A**ir" (**E**piglottis, **C**orniculate, **C**uneiform, **A**pical/vocal process of Arytenoid). * **Paired vs. Unpaired:** * *Unpaired:* Thyroid, Cricoid, Epiglottis. * *Paired:* Arytenoid, Corniculate, Cuneiform. * **Clinical Significance:** Because the Thyroid and Cricoid cartilages are hyaline, they become visible on X-rays in older adults due to calcification, which can sometimes be mistaken for foreign bodies.

Question 1

What is the correct description of the vertebral artery?

Accepted Answer

Passes through the C6 foramen transversarium.

Answer

Arises from the first part of the subclavian artery, posterior to the scalenus anterior.

Answer

Lies posterior to the inferior thyroid artery.

Answer

Passes posterior to the lateral mass of the atlas and then enters the foramen magnum.

Question 2

Which of the following statements is NOT true about the superior laryngeal nerve?

Accepted Answer

It supplies the larynx below the vocal cords.

Answer

Its block anesthetizes the laryngeal mucosa.

Answer

It passes through the thyrohyoid membrane.

Answer

It passes between the thyroid cartilage and the hyoid bone.

Question 3

A patient developed recurrent laryngeal nerve palsy during thyroid surgery. Which of the following laryngeal muscles is/are affected?

Accepted Answer

All

Answer

Posterior cricoarytenoid

Answer

Lateral cricoarytenoid

Answer

Thyroarytenoid

Question 4

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

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 5

Where is the stellate ganglion located?

Accepted Answer

Near the lower cervical spine

Answer

Cerebellum

Answer

Midbrain

Answer

Medulla oblongata

Question 6

Where is the carotid sinus located?

Accepted Answer

Both at the termination of the common carotid artery and at the beginning of the internal carotid artery

Answer

At the termination of the common carotid artery

Answer

Behind the bifurcation of the common carotid artery

Answer

At the beginning of the internal carotid artery

Question 7

Which nerve supplies the sternocleidomastoid muscle?

Accepted Answer

Spinal accessory nerve

Answer

Vagus nerve

Answer

Marginal mandibular branch of facial nerve

Answer

None of the above

Question 8

Which of the following is NOT an elastic laryngeal cartilage?

Accepted Answer

Thyroid

Answer

Epiglottis

Answer

Corniculate

Answer

Cuneiform

Question 9

A 38-year-old man has had thyroid surgery to remove his papillary carcinoma. The external laryngeal nerve, which accompanies the superior thyroid artery, is damaged during the surgery. This injury could result in a severe impairment of function of which of the following?

Accepted Answer

Tensing the vocal cords

Answer

Relaxing the vocal cords

Answer

Rotating the arytenoid cartilages

Answer

Widening the rima glottidis

Question 10

The carotid sheath encloses all of the following except:

Accepted Answer

External carotid artery (ECA) and Internal carotid artery (ICA)

Answer

Common carotid artery (CCA) and Internal carotid artery (ICA)

Answer

Internal jugular vein

Answer

Vagus nerve

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