Neck Practice Questions

Q: During a thyroid operation, a nerve coursing along with the superior thyroid artery is injured. What is the possible consequence of this injury?

Paralysis of the cricothyroid muscle. ### Explanation The correct answer is **D. Paralysis of the cricothyroid muscle.** **1. Why the correct answer is right:** The **superior thyroid artery** is closely related to the **external laryngeal nerve** (a branch of the superior laryngeal nerve). During thyroidectomy, when ligating the superior thyroid artery, this nerve is at high risk of injury if the artery is not ligated close to the gland. The external laryngeal nerve provides motor innervation to only one muscle: the **cricothyroid**. This muscle acts as a tensor of the vocal cords; its paralysis leads to a weak, husky voice and an inability to produce high-pitched sounds. **2. Why the incorrect options are wrong:** * **Option A:** Loss of sensation above the vocal cords is caused by injury to the **internal laryngeal nerve**. While this is also a branch of the superior laryngeal nerve, it travels with the superior laryngeal artery (piercing the thyrohyoid membrane), not the superior thyroid artery. * **Option B:** Loss of sensation below the vocal cords is mediated by the **recurrent laryngeal nerve** [1]. * **Option C:** The lateral cricoarytenoid (and all other intrinsic muscles of the larynx except the cricothyroid) is innervated by the **recurrent laryngeal nerve**, which is related to the *inferior* thyroid artery [1]. **3. Clinical Pearls for NEET-PG:** * **Superior Thyroid Artery:** Ligate **near** the gland to save the External Laryngeal Nerve. * **Inferior Thyroid Artery:** Ligate **away** from the gland to save the Recurrent Laryngeal Nerve [1]. * **The "Singer’s Nerve":** The external laryngeal nerve is often called the singer's nerve because its injury prevents the tension of vocal cords required for high pitch. * **Unilateral Recurrent Laryngeal Nerve injury:** Results in hoarseness of voice. * **Bilateral Recurrent Laryngeal Nerve injury:** Results in inspiratory stridor and dyspnea (emergency) [1].

Q: Which of the following is located in Laimer's triangle?

Esophageal diverticulum. **Explanation:** **Laimer’s Triangle** (also known as Laimer-Haeckermann area) is an anatomical site of potential weakness located on the posterior wall of the esophagus. It is bounded superiorly by the lower border of the **cricopharyngeus muscle** and inferiorly by the upper border of the **circular esophageal muscle fibers**. 1. **Why Option A is correct:** Because the posterior wall in this area is covered only by longitudinal muscle fibers, it represents a point of weakness. A mucosal outpouching through this triangle results in an **Esophageal diverticulum** (specifically, a Zenker’s diverticulum can occasionally involve this area, though Zenker’s more classically occurs in Killian’s dehiscence just above the cricopharyngeus). 2. **Why Options B, C, and D are incorrect:** * **Colonic diverticula** occur due to herniation at points where nutrient arteries (vasa recta) penetrate the muscularis propria of the colon. * **Meckel’s diverticulum** is a true diverticulum located in the distal ileum, resulting from the failure of the vitelline duct to obliterate. * **Peri-ampullary diverticula** are found in the second part of the duodenum near the Ampulla of Vater. **High-Yield Clinical Pearls for NEET-PG:** * **Killian’s Dehiscence:** The most common site for Zenker’s Diverticulum; located between the thyropharyngeus and cricopharyngeus muscles. * **Laimer’s Triangle:** Located *below* the cricopharyngeus. * **Killian-Jamieson Area:** A space on the *anterolateral* aspect of the esophagus, below the cricopharyngeus, where Killian-Jamieson diverticula form. * **Zenker’s Diverticulum** is a "false" pulsion diverticulum.

Q: The stellate ganglion is located anatomically near which structure?

Lower cervical spine. **Explanation:** The **stellate ganglion** (cervicothoracic ganglion) is a sympathetic ganglion formed by the fusion of the **inferior cervical ganglion** and the **first thoracic (T1) ganglion**. **Why the correct answer is right:** Anatomically, the stellate ganglion is situated anterior to the transverse process of the **C7 vertebra** and the neck of the **first rib** [1]. It lies posterior to the vertebral artery and superior to the cupula of the pleura [1]. Therefore, its location is intimately associated with the **lower cervical spine** and the thoracic inlet. **Why the incorrect options are wrong:** * **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 part of the Peripheral Nervous System (specifically the autonomic sympathetic chain) and is located in the neck/upper thorax, far inferior to the brainstem and cerebellum. **Clinical Pearls & High-Yield Facts for NEET-PG:** * **Horner’s Syndrome:** Compression or injury to the stellate ganglion (e.g., by a **Pancoast tumor** at the lung apex) results in ipsilateral ptosis, miosis, and anhidrosis [1]. * **Stellate Ganglion Block:** This procedure is clinically used to treat chronic pain syndromes (like CRPS Type I) or vascular spasms involving the upper limb. * **Relations:** It is located in the **Scalenovertebral triangle** (Triangle of the vertebral artery). * **Function:** It provides sympathetic innervation to the face, neck, and upper extremities.

Q: Which nerve does not supply the muscles of the larynx?

Hypoglossal nerve. The nerve supply to the larynx is a high-yield topic in neuroanatomy, primarily involving branches of the **Vagus nerve (CN X)**. ### **Explanation of the Correct Answer** **C. Hypoglossal nerve:** This is the correct answer because the Hypoglossal nerve (CN XII) provides motor supply to the muscles of the **tongue** (except the palatoglossus). It does not supply any laryngeal muscles. While it descends near the carotid sheath, its distribution is strictly lingual and suprahyoid (via C1 fibers). ### **Analysis of Incorrect Options** * **A. External branch of the superior laryngeal nerve:** This nerve provides motor innervation to exactly one muscle: the **Cricothyroid**. It is often referred to as the "singer’s nerve" because it tenses the vocal cords. * **B. Recurrent laryngeal nerve:** This is the primary motor nerve of the larynx [1]. It supplies **all intrinsic muscles of the larynx** except the cricothyroid [1]. * **D. Internal branch of the superior laryngeal nerve:** While this nerve is primarily **sensory** (supplying the laryngeal mucosa above the vocal folds), it is technically part of the laryngeal nerve complex. However, in the context of "supplying the muscles," it is often a distractor because it pierces the thyrohyoid membrane to provide sensory input, not motor output. ### **NEET-PG High-Yield Pearls** 1. **Sensory Supply:** Above the vocal folds is by the **Internal Laryngeal Nerve**; below the vocal folds is by the **Recurrent Laryngeal Nerve**. 2. **The "Safety Muscle":** The **Posterior Cricoarytenoid** is the only abductor of the vocal folds; it is supplied by the Recurrent Laryngeal Nerve [1]. Bilateral injury leads to respiratory distress. 3. **Clinical Correlation:** Injury to the **External Laryngeal Nerve** (often during thyroidectomy) results in a weak, husky voice and loss of high-pitched notes due to cricothyroid paralysis.

Q: All of the following are features of the C7 vertebra except?

Spine is bifid. The **C7 vertebra**, also known as the **Vertebra Prominens**, is a transitional vertebra that marks the shift from the cervical to the thoracic pattern. ### **Explanation of the Correct Answer** **Option C (Spine is bifid)** is the correct answer because it is a **false** statement. A characteristic feature of typical cervical vertebrae (C2–C6) is a short, bifid (forked) spinous process. In contrast, the C7 vertebra has a **non-bifid**, long, and thick spinous process that ends in a single rounded tubercle. ### **Analysis of Other Options** * **Option A & B:** The C7 spine is notably **long, thick, and nearly horizontal**. It is the first spine that can be easily palpated through the skin at the base of the neck, hence the name "Vertebra Prominens." * **Option D:** In C7, the **anterior tubercle is absent** or very small. The posterior tubercle is large, and the transverse process is characterized by a large size but a small **foramen transversarium**. ### **High-Yield Clinical Pearls for NEET-PG** * **Foramen Transversarium Content:** Unlike C1–C6, the foramen transversarium of C7 **does not** transmit the vertebral artery. It only transmits the **accessory vertebral vein**. * **Cervical Rib:** The anterior root of the C7 transverse process may sometimes develop separately, leading to a **cervical rib**, which can compress the subclavian artery or the lower trunk of the brachial plexus (Thoracic Outlet Syndrome). * **Carotid Tubercle:** Do not confuse C7 with **C6**; the anterior tubercle of C6 is large and known as the **Chassaignac’s tubercle** (Carotid tubercle), where the carotid artery can be compressed against the bone.

Q: The narrowest part of the trachea in a newborn is at which level?

Cricoid cartilage. **Explanation:** In the pediatric airway, specifically in newborns and infants, the narrowest part of the entire upper airway is the **cricoid cartilage**. This is due to the unique funnel-shaped (conical) anatomy of the young larynx, where the airway tapers down toward the subglottic region. The cricoid is the only complete cartilaginous ring in the respiratory tract, making it a non-distensible fixed point. **Analysis of Options:** * **A. Cricoid cartilage (Correct):** In children under 8–10 years, the airway is narrowest at the level of the cricoid ring. This is a critical anatomical difference from adults. * **B. Thyroid cartilage:** This forms the laryngeal prominence but does not represent a point of physiological or anatomical narrowing. * **C. Vocal cords:** In **adults**, the glottis (rima glottidis) at the level of the vocal cords is the narrowest part. In newborns, the glottis is wider than the cricoid lumen. * **D. Subglottic region:** While the cricoid is located in the subglottic region, the specific anatomical structure responsible for the narrowing is the cricoid ring itself. **Clinical Pearls for NEET-PG:** * **Endotracheal Intubation:** Because the cricoid is the narrowest point and non-expandable, **uncuffed endotracheal tubes** were traditionally preferred in neonates to prevent pressure necrosis and subsequent subglottic stenosis. * **Foreign Body Aspiration:** Objects that pass through the vocal cords in a child may still become impacted at the cricoid level. * **Shape Difference:** Remember the mnemonic: **Adult airway is Cylindrical; Pediatric airway is Funnel-shaped.**

Q: The stellate ganglion is located:

Anterior to the transverse process of C7. The **stellate ganglion** (cervicothoracic ganglion) is formed by the fusion of the **inferior cervical ganglion** and the **first thoracic (T1) ganglion**. It is a key component of the sympathetic chain. **Why Option D is Correct:** Anatomically, the stellate ganglion lies in the **root of the neck**. It is situated anterior to the **transverse process of the C7 vertebra** and the neck of the first rib. It lies posterior to the vertebral artery and the carotid sheath. **Analysis of Incorrect Options:** * **Option A:** The sympathetic chain (including the stellate ganglion) lies **anterior** to the prevertebral fascia. This is a critical surgical landmark; the fascia separates the ganglion from the longus colli muscle. * **Option B:** The ganglion is located laterally in the paravertebral gutter, far lateral to the **trachea**, which is a midline structure. * **Option C:** The **middle cervical ganglion** is typically associated with the level of the C6 transverse process (Chassaignac’s tubercle). The stellate ganglion is located more inferiorly. **High-Yield Clinical Pearls for NEET-PG:** * **Horner’s Syndrome:** Injury to the stellate ganglion (e.g., due to a Pancoast tumor or iatrogenic injury during central line placement) results in miosis, ptosis, and anhidrosis. * **Stellate Ganglion Block:** Used to treat complex regional pain syndrome (CRPS) of the upper limb and Raynaud’s disease. The needle is typically directed toward the **C6 tubercle** (easier to palpate) to avoid pleural injury, and the local anesthetic tracks down to the ganglion. * **Relations:** It is separated from the apex of the lung by the **suprapleural membrane (Sibson’s fascia)**.

Q: Injury of which nerve causes vocal cord paralysis?

Recurrent laryngeal. **Explanation:** The **recurrent laryngeal nerve (RLN)** is the primary motor supply to the larynx. It innervates all the intrinsic muscles of the larynx **except** for the cricothyroid muscle. Since these muscles (specifically the posterior cricoarytenoid, the only abductor) are responsible for moving the vocal cords, an injury to the RLN leads to vocal cord paralysis [1]. In unilateral injury, the cord assumes a paramedian position; in bilateral injury, airway obstruction can occur [1]. **Analysis of Incorrect Options:** * **External laryngeal nerve:** This nerve supplies only the **cricothyroid muscle**, which acts as a tensor of the vocal cords. Injury results in a weak, husky voice and loss of high-pitched notes, but not true paralysis of the cords. * **Internal laryngeal nerve:** This is a purely **sensory** nerve. It supplies the laryngeal mucosa above the level of the vocal cords. Injury leads to loss of the cough reflex, increasing the risk of aspiration, but does not affect cord mobility. * **Superior laryngeal nerve:** This is the parent trunk that divides into the internal and external branches. While its injury affects voice quality and sensation, "vocal cord paralysis" specifically refers to the loss of abduction/adduction governed by the RLN. **High-Yield Clinical Pearls for NEET-PG:** * **Posterior Cricoarytenoid:** The "Safety Muscle" of the larynx (the only abductor). * **Semon’s Law:** In progressive lesions of the RLN, abductor fibers are injured first; thus, the cord initially moves to the midline. * **Surgery Risk:** The RLN is most commonly injured during **thyroidectomy** due to its close proximity to the inferior thyroid artery [1]. * **Left vs. Right:** The left RLN has a longer course, looping around the arch of the aorta, making it more susceptible to thoracic pathologies [1].

Question 1

During a thyroid operation, a nerve coursing along with the superior thyroid artery is injured. What is the possible consequence of this injury?

Accepted Answer

Paralysis of the cricothyroid muscle

Answer

Loss of sensation above the vocal cord

Answer

Loss of sensation below the vocal cord

Answer

Paralysis of the lateral cricoarytenoid muscle

Question 2

Which of the following is located in Laimer's triangle?

Accepted Answer

Esophageal diverticulum

Answer

Colonic diverticulum

Answer

Meckel's diverticulum

Answer

Peri-ampullary diverticulum

Question 3

The stellate ganglion is located anatomically near which structure?

Accepted Answer

Lower cervical spine

Answer

Cerebellum

Answer

Midbrain

Answer

Medulla oblongata

Question 4

Which nerve does not supply the muscles of the larynx?

Accepted Answer

Hypoglossal nerve

Answer

External branch of the superior laryngeal nerve

Answer

Recurrent laryngeal nerve

Answer

Internal branch of the superior laryngeal nerve

Question 5

All of the following are features of the C7 vertebra except?

Accepted Answer

Spine is bifid

Answer

Long spinous process

Answer

Spine is long, thick and nearly horizontal

Answer

Anterior tubercle is absent

Question 6

The narrowest part of the trachea in a newborn is at which level?

Accepted Answer

Cricoid cartilage

Answer

Thyroid cartilage

Answer

Vocal cords

Answer

Subglottic region

Question 7

The stellate ganglion is located:

Accepted Answer

Anterior to the transverse process of C7

Answer

Posterior to prevertebral fascia

Answer

Posterior to trachea

Answer

Anterior to the transverse process of C6

Question 8

An 85-year-old ventilator-dependent male was endotracheally intubated 10 days ago. He remains unresponsive and is not a candidate for early extubation. The intensive care unit (ICU) attending elects to perform tracheostomy at the bedside. During the procedure, copious dark blood is encountered. This is most likely due to transection of which of the following?

Accepted Answer

Anterior jugular vein

Answer

External jugular vein

Answer

Internal jugular vein

Answer

Middle thyroid vein

Question 9

What is the most common nerve injured during ligation of the superior thyroid artery?

Accepted Answer

Recurrent laryngeal nerve (RLN)

Answer

Facial nerve

Answer

Mandibular nerve

Answer

Auditory nerve

Question 10

Injury of which nerve causes vocal cord paralysis?

Accepted Answer

Recurrent laryngeal

Answer

External laryngeal

Answer

Internal laryngeal

Answer

Superior laryngeal

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