Neck Practice Questions

Q: A young singer presents with vocal difficulties and an inability to abduct the vocal cords during quiet breathing. Which of the following muscles is most likely paralyzed?

Posterior cricoarytenoid muscle. The core concept tested here is the functional anatomy of the laryngeal muscles. The **Posterior Cricoarytenoid (PCA)** muscle is the **only abductor** of the vocal cords. It originates from the posterior surface of the cricoid lamina and inserts into the muscular process of the arytenoid cartilage. When it contracts, it rotates the arytenoid cartilages laterally, widening the rima glottidis. Paralysis of the PCA leads to the inability to abduct the cords, which can cause respiratory distress as the airway remains narrowed. **Analysis of Incorrect Options:** * **Vocalis muscle:** A part of the thyroarytenoid muscle, its primary role is to adjust the tension (relaxing the vocal ligament) and fine-tune the pitch. * **Cricothyroid muscle:** Known as the "tuner" of the larynx, it tilts the cricoid cartilage to **tense and elongate** the vocal cords. It is the only laryngeal muscle supplied by the **External Laryngeal Nerve**. * **Oblique arytenoid muscle:** Along with the transverse arytenoid, this muscle acts as an **adductor**, closing the posterior part of the rima glottidis. **NEET-PG High-Yield Pearls:** * **"Safety Muscle of the Larynx":** The Posterior Cricoarytenoid is frequently referred to by this name because it keeps the airway open. * **Nerve Supply:** All intrinsic muscles of the larynx are supplied by the **Recurrent Laryngeal Nerve (RLN)**, *except* the Cricothyroid [1]. Injuries to the RLN can result in a vocal cord remaining in a midline or paramedian position due to loss of abduction [1]. * **Semon’s Law:** In progressive RLN injury, abductor fibers (PCA) are typically injured before adductor fibers, leading to a dangerous midline position of the cords.

Q: The facial artery is a branch of which of the following arteries?

External carotid artery. **Explanation:** The **facial artery** is one of the eight major branches of the **External Carotid Artery (ECA)**. It arises in the carotid triangle, just above the lingual artery. It follows a tortuous course, passing deep to the submandibular gland, crossing the base of the mandible (at the anteroinferior angle of the masseter), and ascending towards the medial angle of the eye as the angular artery. Its tortuosity allows for the expansion of the pharynx during swallowing and the movement of the mandible and cheeks. **Analysis of Options:** * **External Carotid Artery (Correct):** The ECA provides the primary arterial supply to the face and neck. Its branches are remembered by the mnemonic *“Some Anatomists Like Freaking Out Poor Medical Students”* (Superior thyroid, Ascending pharyngeal, Lingual, **Facial**, Occipital, Posterior auricular, Maxillary, and Superficial temporal). * **Internal Carotid Artery:** This artery typically has no branches in the neck; it enters the skull to supply the brain and the eye (via the ophthalmic artery). * **Transverse Facial Artery:** This is a branch of the *superficial temporal artery* (a terminal branch of the ECA), not the parent vessel of the facial artery. * **Buccal Artery:** This is a branch of the *maxillary artery* (second part) which supplies the buccinator muscle. **High-Yield Clinical Pearls for NEET-PG:** 1. **Facial Pulse:** Can be palpated at the lower border of the mandible at the anterior edge of the masseter muscle. 2. **Dangerous Area of the Face:** The facial vein communicates with the **cavernous sinus** via the ophthalmic veins and pterygoid plexus. Since these veins are valveless, infections from the face can lead to cavernous sinus thrombosis. 3. **Anastomosis:** The terminal branch of the facial artery (angular artery) anastomoses with the dorsal nasal branch of the ophthalmic artery, representing a key site of communication between the ECA and ICA systems.

Q: What is the main motor nerve supply to the pharynx?

Accessory nerve. The motor supply to the pharynx is primarily derived from the Pharyngeal Plexus, which is located on the surface of the middle constrictor muscle. **1. Why Option B is Correct:** The pharyngeal plexus is formed by the pharyngeal branches of the Vagus (CN X) and Glossopharyngeal (CN IX) nerves, along with sympathetic fibers. However, the **motor fibers** themselves originate from the **Cranial Part of the Accessory Nerve (CN XI)**. These fibers join the Vagus nerve at the inferior ganglion and are distributed through its pharyngeal branches to supply all muscles of the pharynx (except the Stylopharyngeus). Therefore, while the Vagus acts as the "vehicle," the functional motor origin is the Cranial Accessory nerve. **2. Why the other options are incorrect:** * **Vagus Nerve (A):** While the Vagus carries the motor fibers to the muscles, it is technically the pathway. In classical anatomy teaching for competitive exams, the functional origin (CN XI) is prioritized. * **Glossopharyngeal Nerve (C):** This nerve is primarily **sensory** to the oropharynx. It supplies motor innervation to only one muscle: the **Stylopharyngeus**. * **Facial Nerve (D):** This nerve supplies the muscles of facial expression and the posterior belly of the digastric/stylohyoid, but has no motor role in the pharyngeal constrictors. **High-Yield Clinical Pearls for NEET-PG:** * **The "All-Except" Rule:** All muscles of the pharynx are supplied by the Cranial Accessory nerve via the Pharyngeal plexus **EXCEPT** the **Stylopharyngeus**, which is supplied by the **Glossopharyngeal nerve** (derived from the 3rd branchial arch). * **Passavant’s Ridge:** Formed by the palatopharyngeus muscle; it helps in sealing the nasopharynx during swallowing. * **Killian’s Dehiscence:** A potential gap between the thyropharyngeus and cricopharyngeus parts of the inferior constrictor; it is the site for **Zenker’s diverticulum**.

Q: Which of the following is most important in separating the esophagus from the larynx, and must consequently be carefully passed behind during endoscopy?

Epiglottis. **Explanation:** The **epiglottis** is a leaf-shaped fibrocartilaginous structure located at the entrance of the larynx. Its primary physiological role is to act as a "trapdoor" that covers the laryngeal inlet during deglutition (swallowing). In the context of endoscopy, the epiglottis serves as the most critical anatomical landmark for separating the respiratory path from the digestive path. To enter the esophagus, the endoscope must be passed **posterior** to the epiglottis and the larynx into the laryngopharynx (specifically the piriform recess) to reach the esophageal opening. **Analysis of Options:** * **Arytenoids (A):** These are paired cartilages located at the posterior aspect of the larynx. While they help define the laryngeal inlet, they are not the primary structure separating the two tracts during the initial passage of the scope. * **Cricoid Cartilage (B):** This is the only complete cartilaginous ring of the airway. It marks the level where the pharynx becomes the esophagus (C6), but it lies anterior to the esophageal opening rather than acting as the separator to be bypassed. * **Pharynx (D):** This is the common chamber for both air and food. It does not separate the two; rather, it is the space through which the scope travels before reaching the point of separation. **Clinical Pearls for NEET-PG:** * **Anatomical Level:** The esophagus begins at the lower border of the cricoid cartilage, corresponding to the **C6 vertebral level**. * **Narrowest Point:** The **cricopharyngeal sphincter** (upper esophageal sphincter) is the narrowest part of the entire digestive tract (excluding the appendix) and is a common site for foreign body impaction [1]. * **Nerve Supply:** The sensory innervation of the epiglottis (upper surface) is by the **internal laryngeal nerve** (branch of CN X), which triggers the cough reflex if touched.

Q: Which of the following statements about the vertebral artery is/are true?

1, 2, 4 are false and 3, 5 are true. The vertebral artery is a critical branch of the first part of the subclavian artery, essential for the blood supply to the posterior brain. To understand the correct answer (B), we must analyze the four segments of the artery: 1. **Statement 1 (False):** The vertebral artery typically enters the **foramen transversarium of the C6 vertebra**, not C7. The C7 foramen transversarium contains only small accessory vertebral veins. 2. **Statement 2 (False):** The artery ascends through the foramina of C6 to C1. It does not pass through the foramen magnum immediately after C6; it first winds behind the lateral mass of the atlas (C1). 3. **Statement 3 (True):** The **V3 segment** (Atlantic part) lies in the groove on the superior surface of the posterior arch of the **atlas (C1)**, within the suboccipital triangle. 4. **Statement 4 (False):** The two vertebral arteries join to form the **basilar artery** at the **lower border of the pons** (pontomedullary junction), not the midbrain. 5. **Statement 5 (True):** The largest branch of the fourth part (V4) of the vertebral artery is the **Posterior Inferior Cerebellar Artery (PICA)**. **Clinical Pearls for NEET-PG:** * **Segments:** V1 (Pre-foraminal), V2 (Foraminal: C6-C1), V3 (Atlantic/Extradural), V4 (Intracranial). * **Wallenberg Syndrome:** Lateral Medullary Syndrome is most commonly caused by occlusion of the **PICA** or the vertebral artery itself. * **Subclavian Steal Syndrome:** Occurs due to proximal subclavian stenosis, leading to retrograde flow in the ipsilateral vertebral artery.

Q: Which of the following statements about the phrenic nerve is FALSE?

It is formed in front of the scalenus medius muscle.. The phrenic nerve is a vital structure in the neck and thorax. Understanding its precise anatomical relations is high-yield for NEET-PG. ### **Why Option C is the Correct (False) Statement** The phrenic nerve is formed at the lateral border of the **scalenus anterior** muscle, not the scalenus medius. It descends vertically across the anterior surface of the scalenus anterior, held in place by the prevertebral fascia. The scalenus medius lies posterior to the roots of the brachial plexus, whereas the phrenic nerve is situated more anteriorly. ### **Analysis of Other Options** * **Option A (True):** It provides the sole motor supply to the diaphragm (C3, C4, C5). It also carries sensory fibers from the central part of the diaphragm, mediastinal pleura, and pericardium. * **Option B (True):** An accessory phrenic nerve (often a branch from the nerve to the subclavius) is present in about 30% of individuals. It usually joins the main phrenic nerve at the level of the first rib or the root of the neck. * **Option C (True):** In the neck, the nerve descends deep to the internal jugular vein and is covered by the **sternocleidomastoid** muscle, the inferior belly of the omohyoid, and the prevertebral fascia. ### **High-Yield Clinical Pearls** * **Root Value:** "C3, 4, 5 keep the diaphragm alive." * **Surface Marking:** It corresponds to a line joining a point 3 cm from the midline at the level of the upper border of the thyroid cartilage to a point at the medial end of the clavicle. * **Referred Pain:** Irritation of the phrenic nerve (e.g., gallbladder disease or subphrenic abscess) often causes referred pain to the **right shoulder** (C4 dermatome). * **Relation to Vessels:** At the root of the neck, it passes **posterior** to the subclavian vein and **anterior** to the subclavian artery.

Q: All of the following are branches of the thyrocervical trunk except?

Superior thyroid artery. The **thyrocervical trunk** is a short, thick branch arising from the **first part of the subclavian artery**, just medial to the anterior scalene muscle. Understanding its branches is high-yield for NEET-PG. ### **Why Option D is Correct** The **Superior thyroid artery** is the first branch of the **External Carotid Artery**. It descends to the upper pole of the thyroid gland, accompanied by the external laryngeal nerve. It does not originate from the subclavian system. ### **Analysis of Incorrect Options** The thyrocervical trunk typically divides into four main branches (often remembered by the mnemonic **SITS** or **STAT**): * **A. Inferior thyroid artery:** The largest branch of the trunk; it supplies the lower pole of the thyroid and gives off the inferior laryngeal artery. * **B. Suprascapular artery:** Passes anterior to the anterior scalene muscle and phrenic nerve to reach the posterior aspect of the scapula. * **C. Superficial cervical artery:** (Also known as the ascending branch of the transverse cervical artery). It supplies the trapezius and lateral neck muscles. * *Note: The fourth branch is the **Ascending cervical artery**.* ### **Clinical Pearls for NEET-PG** 1. **Surgical Landmark:** During thyroidectomy, the **Inferior thyroid artery** is closely related to the **Recurrent Laryngeal Nerve** [1]. The nerve usually passes posterior to the artery [1]. 2. **Anastomosis:** The superior and inferior thyroid arteries form a vital collateral circulation between the External Carotid and Subclavian arteries. 3. **Internal Thoracic Artery:** Also arises from the first part of the subclavian artery but descends inferiorly into the thorax, unlike the thyrocervical trunk which ascends.

Question 1

A young singer presents with vocal difficulties and an inability to abduct the vocal cords during quiet breathing. Which of the following muscles is most likely paralyzed?

Accepted Answer

Posterior cricoarytenoid muscle

Answer

Vocalis muscle

Answer

Cricothyroid muscle

Answer

Oblique arytenoid muscle

Question 2

The facial artery is a branch of which of the following arteries?

Accepted Answer

External carotid artery

Answer

Internal carotid artery

Answer

Transverse facial artery

Answer

Buccal artery

Question 3

Which spinal nerve is related to the hypoglossal nerve?

Accepted Answer

Hypoglossal

Answer

Glossopharyngeal

Answer

Vagus

Answer

Facial

Question 4

The suprascapular artery arises from which of the following branches of the subclavian artery?

Accepted Answer

Thyrocervical trunk

Answer

Internal thoracic artery

Answer

Costocervical trunk

Answer

Dorsal scapular artery

Question 5

What is the main motor nerve supply to the pharynx?

Accepted Answer

Accessory nerve

Answer

Vagus nerve

Answer

Glossopharyngeal nerve

Answer

Facial nerve

Question 6

Which of the following is most important in separating the esophagus from the larynx, and must consequently be carefully passed behind during endoscopy?

Accepted Answer

Epiglottis

Answer

Arytenoids

Answer

Cricoid cartilage

Answer

Pharynx

Question 7

Which of the following statements about the vertebral artery is/are true?

Accepted Answer

1, 2, 4 are false and 3, 5 are true

Answer

1, 2, 3 are true and 4, 5 are false

Answer

1, 3, 5 are true and 2, 4 are false

Answer

All are true

Question 8

Which of the following statements about the phrenic nerve is FALSE?

Accepted Answer

It is formed in front of the scalenus medius muscle.

Answer

It is the primary motor supply to the diaphragm.

Answer

The accessory phrenic nerve joins the phrenic nerve near the first rib.

Answer

It descends posterior to the sternocleidomastoid muscle.

Question 9

Which of the following statements about the External Jugular vein is FALSE?

Accepted Answer

It is formed by the anterior division of the retromandibular vein and the posterior auricular vein

Answer

It is deep to Platysma

Answer

It crosses the Sternocleidomastoid muscle

Answer

It drains into the Subclavian vein

Question 10

All of the following are branches of the thyrocervical trunk except?

Accepted Answer

Superior thyroid artery

Answer

Inferior thyroid artery

Answer

Suprascapular artery

Answer

Superficial cervical artery

Neck — MCQs

Neck — MCQs

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