Neck Practice Questions

Q: A person is brought to an emergency department after experiencing sudden difficulty in breathing. A low tracheostomy is performed below the isthmus of the thyroid. Which of the following vessels may be encountered?

Inferior thyroid vein. **Explanation:** In a **low tracheostomy** (performed below the isthmus of the thyroid gland, typically at the level of the 2nd to 4th tracheal rings), the surgeon must navigate the pretracheal space. The **inferior thyroid veins** arise from a venous plexus on the thyroid gland and descend in front of the trachea to drain into the left brachiocephalic vein [1]. Because of their midline position below the isthmus, they are the most likely vessels to be encountered and must be retracted or ligated to avoid hemorrhage [1]. **Analysis of Options:** * **Inferior thyroid vein (Correct):** These veins descend directly in front of the cervical trachea below the isthmus, making them vulnerable during midline surgical approaches [1]. * **Inferior thyroid artery (Incorrect):** This is a branch of the thyrocervical trunk. It approaches the thyroid gland from a **lateral** position and lies deep to the prevertebral fascia, not in the midline pretracheal path [1]. * **Superior thyroid artery (Incorrect):** This artery arises from the external carotid and enters the **upper pole** of the thyroid gland, well above the site of a low tracheostomy [2]. * **Costocervical trunk (Incorrect):** This is a branch of the second part of the subclavian artery located deep in the root of the neck, far from the tracheal midline. **Clinical Pearls for NEET-PG:** 1. **Thyroidea Ima Artery:** In 3–10% of individuals, this accessory artery arises from the brachiocephalic trunk or aortic arch and ascends in the midline to the isthmus. It is a high-yield "danger" vessel in low tracheostomies. 2. **Left Brachiocephalic Vein:** In children, this vein may ascend above the suprasternal notch, posing a risk during the procedure. 3. **Isthmus Level:** The thyroid isthmus usually covers the **2nd, 3rd, and 4th tracheal rings**. A high tracheostomy is done above it, and a low one below it.

Q: What is the most common site of a thyroglossal cyst?

Below the hyoid bone. A **thyroglossal cyst** is the most common congenital midline neck swelling [1]. It develops from a persistent remnant of the **thyroglossal duct**, which marks the descent of the thyroid gland from the *foramen caecum* at the base of the tongue to its final position in the neck [2]. **Why "Below the Hyoid Bone" is correct:** During embryological descent, the thyroglossal duct passes anterior to, through, or posterior to the hyoid bone [2]. While a cyst can form anywhere along this tract, the **subhyoid location (below the hyoid bone)** is the most frequent site, accounting for approximately **65% of cases**. **Analysis of Incorrect Options:** * **Above the hyoid bone (Suprahyoid):** This is the second most common site (approx. 20-25%) but occurs less frequently than the subhyoid position. * **At the hyoid bone:** Though the duct is intimately related to the hyoid, cysts located exactly at the level of the bone are less common than those just below it. * **At the thyroid isthmus:** While cysts can occur near the isthmus (pre-laryngeal), this represents a smaller percentage of cases compared to the subhyoid region. **Clinical Pearls for NEET-PG:** 1. **Pathognomonic Sign:** The cyst moves upward on **protrusion of the tongue** [2] (due to its attachment to the foramen caecum via the duct) and on **deglutition** (swallowing). 2. **Surgical Management:** The procedure of choice is **Sistrunk’s Operation**, which involves excision of the cyst, the entire duct, and the **central part of the hyoid bone** to prevent recurrence. 3. **Ectopic Thyroid:** Always perform an ultrasound to confirm the presence of a normal thyroid gland, as the cyst may contain the patient's only functioning thyroid tissue [1].

Q: Which of the following is not an anatomical triangle of the anterior neck?

Subclavian triangle. The neck is divided into two primary regions by the **Sternocleidomastoid (SCM)** muscle: the **Anterior Triangle** and the **Posterior Triangle**. ### Why "Subclavian Triangle" is the Correct Answer The **Subclavian triangle** (also known as the **Supraclavicular** or **Omoclavicular triangle**) is a subdivision of the **Posterior Triangle**, not the anterior. It is bounded superiorly by the inferior belly of the omohyoid, inferiorly by the clavicle, and anteriorly by the posterior border of the SCM. Its primary content is the third part of the subclavian artery. ### Analysis of Incorrect Options (Anterior Triangle Subdivisions) The Anterior Triangle is bounded by the midline of the neck, the anterior border of the SCM, and the lower border of the mandible. It is further divided into: * **Digastric (Submandibular) Triangle:** Located between the two bellies of the digastric muscle and the mandible. It contains the submandibular gland and facial artery. * **Carotid Triangle:** Bounded by the superior belly of omohyoid, posterior belly of digastric, and SCM. It is high-yield because it contains the **Carotid Sheath** (Common Carotid artery, Internal Jugular vein, and Vagus nerve). * **Submental Triangle:** An unpaired triangle below the chin, bounded by the hyoid bone and the anterior bellies of the left and right digastric muscles. ### NEET-PG High-Yield Pearls * **Muscular Triangle:** The fourth subdivision of the anterior triangle; it contains the infrahyoid muscles and the thyroid gland. * **Occipital Triangle:** The larger subdivision of the posterior triangle (above the omohyoid), containing the **Spinal Accessory Nerve (CN XI)**. * **Nerve Point of the Neck:** Located at the posterior border of the SCM, where cutaneous branches of the cervical plexus emerge.

Q: At which border of the thyroid cartilage does the common carotid artery bifurcate?

Superior. The bifurcation of the common carotid artery (CCA) is a high-yield anatomical landmark frequently tested in postgraduate medical exams. ### **Explanation of the Correct Answer** The common carotid artery typically bifurcates into the internal and external carotid arteries at the level of the **superior border of the thyroid cartilage**. In terms of vertebral levels, this corresponds to the **C3-C4 intervertebral disc** or the upper level of the **C4 vertebra**. At this point, the artery dilated to form the **carotid sinus** (a baroreceptor) and contains the **carotid body** (a chemoreceptor) in its posterior wall. ### **Analysis of Incorrect Options** * **B. Inferior Border:** This level (C6 vertebra) corresponds to the beginning of the trachea and esophagus, the cricoid cartilage, and where the Omohyoid muscle crosses the CCA. It is the site where the CCA enters the carotid sheath, not where it bifurcates. * **C & D. Lateral and Medial Borders:** These are descriptive anatomical surfaces of the thyroid gland and cartilage. The CCA ascends laterally to the thyroid gland within the carotid sheath, but these borders do not define the vertical level of bifurcation. ### **NEET-PG High-Yield Pearls** * **Vertebral Level:** Remember the "C4" rule for the carotid bifurcation. * **Surface Anatomy:** The bifurcation occurs at the level of the **greater horn of the hyoid bone** (slightly above the thyroid cartilage) or the superior thyroid notch. * **Carotid Triangle:** The bifurcation occurs within the carotid triangle, bounded by the superior belly of the omohyoid, the posterior belly of the digastric, and the anterior border of the sternocleidomastoid. * **Clinical Significance:** This is the site for carotid endarterectomy and where the carotid pulse is most easily palpated against the transverse processes of cervical vertebrae.

Q: Which of the following structures is NOT found in the suprasternal space?

External jugular vein. ### Explanation The **Suprasternal Space (Space of Burns)** is a small compartment formed by the splitting of the **investing layer of deep cervical fascia** above the manubrium sterni. It contains specific structures that are frequently tested in NEET-PG. #### Why External Jugular Vein (EJV) is the Correct Answer: The **External Jugular Vein** is a superficial structure that lies **superficial to the investing layer of deep cervical fascia** and runs across the sternocleidomastoid muscle. Since the suprasternal space is located *between* two layers of the investing fascia, the EJV remains outside this space. #### Analysis of Incorrect Options: * **Jugular Arch:** This is a transverse venous communication that connects the two anterior jugular veins within the suprasternal space. It is a key content. * **Anterior Jugular Vein:** The terminal portions of these veins enter the space before turning laterally to drain into the external jugular or subclavian veins. * **Sternal head of Sternocleidomastoid (SCM):** The investing fascia splits to enclose the SCM. The sternal heads of these muscles form the lateral boundaries of the suprasternal space. #### NEET-PG High-Yield Pearls: 1. **Contents of Suprasternal Space:** * Sternal heads of SCM. * Lower ends of Anterior Jugular Veins. * **Jugular venous arch.** * Interclavicular ligament. * Few lymph nodes and fatty tissue. 2. **Clinical Significance:** A tracheostomy performed too low can inadvertently damage the **jugular venous arch** within this space, leading to significant hemorrhage. 3. **Boundaries:** Anteriorly by the superficial layer and posteriorly by the deep layer of the investing fascia. *Note: None of the provided references contain anatomical data regarding the suprasternal space or cervical fascia.*

Q: Which neck swelling moves on swallowing?

Thyroid gland. The **Thyroid gland** is the correct answer because of its unique anatomical relationship with the **Pretracheal fascia**. The thyroid gland is enclosed within the pretracheal layer of deep cervical fascia, which attaches the gland to the **cricoid cartilage** and the **oblique line of the thyroid cartilage**. During swallowing, the larynx and trachea are elevated by the suprahyoid muscles; because the thyroid is anchored to these laryngeal cartilages, it moves upward in unison with them. **Analysis of Incorrect Options:** * **Submandibular salivary gland:** While located in the neck, it is enclosed in the investing layer of deep cervical fascia and is not attached to the laryngeal framework. It moves with the jaw but not with deglutition. * **Supraclavicular lymph node (Virchow’s node):** These are located in the fatty tissue of the posterior triangle. They are not attached to the trachea or larynx and remain stationary during swallowing. * **Sternomastoid tumour:** This is a fibromatous growth within the sternocleidomastoid muscle (often seen in congenital torticollis). It moves with the muscle but is independent of the swallowing mechanism. **High-Yield NEET-PG Pearls:** 1. **Exceptions:** Two other structures move with swallowing: **Thyroglossal cysts** [1] (due to their attachment to the hyoid bone) and **Subhyoid bursitis**. 2. **The Tongue Protrusion Test:** A thyroglossal cyst moves upward both on swallowing *and* on protrusion of the tongue (due to its attachment to the foramen caecum via the tract) [1]. A thyroid swelling moves *only* on swallowing. 3. **Berry’s Ligament:** The posterior suspensory ligament of Berry fixes the thyroid lobes to the cricoid cartilage, further ensuring it moves with the larynx.

Q: The right common carotid artery arises from which of the following structures?

Brachiocephalic artery. The origin of the common carotid arteries is a classic high-yield anatomy topic, focusing on the asymmetry of the great vessels. [1] **1. Why the Correct Answer is Right:** The **Brachiocephalic artery** (also known as the innominate artery) is the first and largest branch of the arch of the aorta. It ascends to the level of the right sternoclavicular joint, where it bifurcates into the **right common carotid artery** and the right subclavian artery. This arrangement ensures the right side of the head, neck, and upper limb receives oxygenated blood. **2. Analysis of Incorrect Options:** * **A. Right axillary artery:** This is the continuation of the subclavian artery distal to the outer border of the first rib; it supplies the upper limb, not the neck. * **B. Arch of aorta:** While the **left** common carotid artery arises directly from the arch of the aorta (as the second branch), the right common carotid does not. * **D. Left subclavian artery:** This is the third branch of the aortic arch and supplies the left upper limb. **3. Clinical Pearls & High-Yield Facts for NEET-PG:** * **Asymmetry:** Remember the "3-2-1" rule for the aortic arch branches: 3 branches (Brachiocephalic, Left Common Carotid, Left Subclavian). [1] The right side has a shared trunk (Brachiocephalic), whereas the left side branches arise independently. * **Bifurcation Level:** The common carotid artery typically bifurcates into internal and external carotid arteries at the level of the **upper border of the thyroid cartilage (C4 level)**. * **Carotid Sinus:** Located at the bifurcation, it acts as a baroreceptor (innervated by CN IX). * **Surface Anatomy:** The origin of the brachiocephalic trunk is behind the center of the manubrium sterni. [1]

Q: Which of the following best describes the function of the cricothyroid muscle?

Tensor of vocal cords. Explanation: The **cricothyroid muscle** is unique among the laryngeal muscles and is a high-yield topic for NEET-PG. Its primary function is to tilt the thyroid cartilage forward and downward at the cricothyroid joint. This action increases the distance between the thyroid angle and the arytenoid cartilages, thereby **stretching and tensing the vocal cords**. This tension is essential for producing high-pitched sounds. **Analysis of Options:** * **A & B (Abductor of vocal cords):** These are incorrect. The **posterior cricoarytenoid** is the *only* abductor of the vocal cords (the "safety muscle of the larynx"). * **D (Supplied by the recurrent laryngeal nerve):** This is incorrect. The cricothyroid is the **only** intrinsic laryngeal muscle supplied by the **external laryngeal nerve** (a branch of the superior laryngeal nerve) [1]. All other intrinsic muscles are supplied by the recurrent laryngeal nerve [1]. **High-Yield NEET-PG Pearls:** 1. **Nerve Supply Rule:** All intrinsic muscles of the larynx are supplied by the Recurrent Laryngeal Nerve (RLN) **EXCEPT** the Cricothyroid (External Laryngeal Nerve) [1]. 2. **Action Rule:** All intrinsic muscles act as adductors (closing the glottis) **EXCEPT** the Posterior Cricoarytenoid (Abductor). 3. **Clinical Correlation:** Injury to the external laryngeal nerve (often during thyroid surgery) results in an inability to tense the vocal cords, leading to a **weak, husky voice** and loss of high-pitch frequency (important for singers). 4. **Emergency Airway:** The cricothyroid membrane, located between the thyroid and cricoid cartilages, is the site for an emergency **cricothyroidotomy**.

Question 1

A person is brought to an emergency department after experiencing sudden difficulty in breathing. A low tracheostomy is performed below the isthmus of the thyroid. Which of the following vessels may be encountered?

Accepted Answer

Inferior thyroid vein

Answer

Inferior thyroid artery

Answer

Costocervical trunk

Answer

Superior thyroid artery

Question 2

Which of the following is NOT a feature of the neck fascia?

Accepted Answer

Investing layer of deep cervical fascia lies deep to the parotid gland.

Answer

Superficial fascia contains platysma, external and anterior jugular veins.

Answer

Pretracheal fascia extends as far as the fibrous pericardium.

Answer

Prevertebral fascia extends from the base of the skull to the axilla.

Question 3

What is the most common site of a thyroglossal cyst?

Accepted Answer

Below the hyoid bone

Answer

Above the hyoid bone

Answer

At the hyoid bone

Answer

At the thyroid isthmus

Question 4

Which of the following is not an anatomical triangle of the anterior neck?

Accepted Answer

Subclavian triangle

Answer

Digastric triangle

Answer

Carotid triangle

Answer

Submental triangle

Question 5

At which border of the thyroid cartilage does the common carotid artery bifurcate?

Accepted Answer

Superior

Answer

Inferior

Answer

Lateral

Answer

Medial

Question 6

The superior thyroid artery is anatomically related to which of the following nerves?

Accepted Answer

External laryngeal nerve

Answer

Recurrent laryngeal nerve

Answer

Internal laryngeal nerve

Answer

Chorda tympani nerve

Question 7

Which of the following structures is NOT found in the suprasternal space?

Accepted Answer

External jugular vein

Answer

Jugular arch

Answer

Anterior jugular vein

Answer

Sternal head of sternocleidomastoid muscle

Question 8

Which neck swelling moves on swallowing?

Accepted Answer

Thyroid gland

Answer

Submandibular salivary gland

Answer

Supraclavicular lymph node

Answer

Sternomastoid tumour

Question 9

The right common carotid artery arises from which of the following structures?

Accepted Answer

Brachiocephalic artery

Answer

Right axillary artery

Answer

Arch of aorta

Answer

Left subclavian artery

Question 10

Which of the following best describes the function of the cricothyroid muscle?

Accepted Answer

Tensor of vocal cords

Answer

Abductor of vocal cords

Answer

Abductor of vocal cords

Answer

Supplied by the recurrent laryngeal nerve

Neck — MCQs

Neck — MCQs

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