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 features of the neonatal airway enables a baby to breathe while suckling breast milk?

Higher position of the larynx. **Explanation:** The correct answer is **C. Higher position of the larynx.** In neonates, the larynx is positioned higher in the neck, with the epiglottis located at the level of the **C2–C4 vertebrae** (compared to C3–C6 in adults). This anatomical arrangement allows the epiglottis to approximate the soft palate, creating a physical separation between the respiratory and digestive tracts. This "high-riding" larynx forms a protected airway channel, enabling the infant to swallow milk laterally through the pyriform fossae while simultaneously breathing through the nasopharynx. This is a vital evolutionary adaptation for efficient feeding and airway protection. **Analysis of Incorrect Options:** * **A. Large, wide tongue:** While true that a neonate’s tongue is relatively large for the oral cavity, this is a disadvantage as it predisposes the infant to airway obstruction, especially during anesthesia or unconsciousness. * **B. Small pharynx:** A smaller pharyngeal space does not facilitate simultaneous breathing and swallowing; rather, it increases airway resistance. * **D. Large, soft palate:** While the soft palate is relatively large and meets the epiglottis, it is the **position of the larynx** that is the primary anatomical driver of this physiological mechanism. **High-Yield Clinical Pearls for NEET-PG:** * **Shape of Epiglottis:** In neonates, the epiglottis is **Omega-shaped (Ω)**, longer, and more flaccid, making intubation more challenging. * **Narrowest Part of Airway:** In children <8 years, the narrowest part is the **Cricoid cartilage** (subglottic region), whereas in adults, it is the Glottis (vocal cords). * **Obligate Nasal Breathers:** Neonates are obligate nasal breathers until approximately 4–6 months of age due to the high position of the larynx and the close proximity of the tongue to the soft palate.

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: Which of the following structures does NOT form a boundary of the posterior triangle of the neck?

Splenius cervicis. To master the anatomy of the neck for NEET-PG, it is essential to distinguish between the **boundaries** (the walls) and the **floor** of the neck triangles. ### **Why Splenius Cervicis is the Correct Answer** The **Splenius cervicis** (along with the Splenius capitis, Levator scapulae, and Scalenus medius) forms the **floor** of the posterior triangle, not its boundaries. The boundaries are the structural "frames" that define the triangular space, whereas the floor consists of the muscles covered by the prevertebral fascia upon which the contents of the triangle rest. ### **Analysis of Boundaries (Incorrect Options)** The posterior triangle is anatomically defined by the following borders: * **Anterior Boundary (Option C):** Formed by the posterior border of the **Sternocleidomastoid** muscle. * **Posterior Boundary (Option A):** Formed by the anterior border of the **Trapezius** muscle. * **Inferior Boundary/Base (Option D):** Formed by the middle one-third of the **Clavicle**. * **Apex:** Point where the Sternocleidomastoid and Trapezius meet at the superior nuchal line of the occipital bone. * **Roof:** Formed by the investing layer of deep cervical fascia. ### **High-Yield Clinical Pearls for NEET-PG** * **The "Carefree" vs. "Careful" Area:** The posterior triangle is divided by the inferior belly of the omohyoid into the **occipital triangle** (large, superior) and the **supraclavicular/subclavian triangle** (small, inferior). * **Spinal Accessory Nerve (CN XI):** This is the most important structure crossing the posterior triangle. It lies superficial, just beneath the investing fascia, making it highly susceptible to injury during lymph node biopsies. * **Erb’s Point:** Located at the posterior border of the sternocleidomastoid, this is where six nerves emerge (4 cutaneous branches of the cervical plexus, the spinal accessory nerve, and the nerve to subclavius).

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

Galen's anastomosis between the superior laryngeal nerve (SLN) and the recurrent laryngeal nerve (RLN) is what type of nerve fiber connection?

Accepted Answer

Purely sensory

Answer

Purely motor

Answer

Secretomotor

Answer

Mixed

Question 5

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 6

Which of the following features of the neonatal airway enables a baby to breathe while suckling breast milk?

Accepted Answer

Higher position of the larynx

Answer

Large, wide tongue

Answer

Small pharynx

Answer

Large, soft palate

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

Which of the following structures does NOT form a boundary of the posterior triangle of the neck?

Accepted Answer

Splenius cervicis

Answer

Trapezius

Answer

Sternocleidomastoid

Answer

Clavicle

Question 10

Which of the following is NOT true regarding the suboccipital triangle?

Accepted Answer

Rectus capitis posterior major and minor form the boundaries of the suboccipital triangle.

Answer

Semispinalis capitis forms the roof of the suboccipital triangle.

Answer

The posterior atlantooccipital membrane forms the floor of the suboccipital triangle.

Answer

It contains the third part of the vertebral artery.

Neck — MCQs

Neck — MCQs

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