Neck Practice Questions

Q: The hyoid bone lies at the level of which cervical vertebra?

C3. The **hyoid bone** is a unique, U-shaped bone located in the anterior midline of the neck. It serves as a vital anchor for the tongue and the suprahyoid/infrahyoid muscles. In a neutral anatomical position, the body of the hyoid bone lies at the level of the **C3 vertebra**. **Why C3 is Correct:** The hyoid bone is situated between the mandible and the thyroid cartilage. It marks the boundary between the upper and lower parts of the neck. Anatomically, the horizontal plane passing through the hyoid bone corresponds to the third cervical vertebra (C3). This level is also a landmark for the bifurcation of the **Common Carotid Artery** into the internal and external carotid arteries. **Analysis of Incorrect Options:** * **C5:** This level corresponds to the **thyroid cartilage** (specifically the lower part) and the site where the carotid artery is most superficial. * **C7:** This is the level of the **vertebra prominens** and is near the junction of the larynx with the trachea and the pharynx with the esophagus (which actually occurs at C6). * **T2:** This level corresponds to the **suprasternal (jugular) notch** and the superior border of the manubrium sterni. **High-Yield Clinical Pearls for NEET-PG:** * **Fracture of Hyoid:** In forensic medicine, a fractured hyoid bone is a pathognomonic sign of **strangulation or throttling**. * **Development:** The hyoid develops from the **2nd branchial arch** (lesser horn) and **3rd branchial arch** (greater horn and body). * **Unique Feature:** It is the only bone in the human body that **does not articulate** with any other bone; it is suspended by muscles and ligaments (e.g., stylohyoid ligament).

Q: The isthmus of the thyroid gland overlies which tracheal cartilages?

The 2nd, 3rd, and 4th tracheal cartilages. The thyroid gland consists of two lateral lobes connected by a central **isthmus**. In a standard anatomical position, the isthmus lies anterior to the trachea [1], specifically overlying the **2nd, 3rd, and 4th tracheal rings**. This relationship is a high-yield anatomical landmark used in both surgical procedures and clinical examinations. * **Why Option C is correct:** The isthmus typically measures about 1.25 cm in both height and width. It is positioned horizontally across the midline, covering the middle three of the upper five tracheal cartilages (2nd to 4th). * **Why Options A & B are incorrect:** The **1st tracheal cartilage** is usually avoided by the isthmus. It lies immediately below the cricoid cartilage. Placing the isthmus here would interfere with the cricothyroid membrane and the larynx's mobility. * **Why Option D is incorrect:** While the isthmus does cover the 3rd and 4th rings, it also consistently covers the 2nd ring. Limiting it to only the 3rd and 4th is anatomically incomplete. **High-Yield Clinical Pearls for NEET-PG:** 1. **Tracheostomy:** This is a life-saving procedure where an opening is made in the trachea. To avoid the vascular thyroid isthmus, the incision is typically made either **above** it (rare) or, more commonly, the isthmus is retracted/divided to access the **2nd and 3rd tracheal rings** [2]. 2. **Pyramidal Lobe:** In about 40% of individuals, a small conical projection called the pyramidal lobe extends upwards from the isthmus (usually the left side) toward the hyoid bone, representing a remnant of the **thyroglossal duct** [1]. 3. **Levator Glandulae Thyroideae:** A fibromuscular band that may connect the isthmus or pyramidal lobe to the hyoid bone.

Q: The isthmus of the thyroid gland overlies which tracheal cartilages?

The 2nd, 3rd, and 4th tracheal cartilages. The thyroid gland consists of two lateral lobes connected by a central bridge called the **isthmus**. In a standard anatomical position, the isthmus lies anterior to the trachea [1]. **Why Option C is Correct:** The isthmus typically extends horizontally across the **2nd, 3rd, and 4th tracheal rings**. This positioning is a high-yield anatomical landmark used by surgeons to identify the trachea and avoid injury to the gland during procedures [2]. **Analysis of Incorrect Options:** * **Option A & B:** The **1st tracheal cartilage** is usually avoided by the isthmus to prevent interference with the cricoid cartilage and the cricothyroid membrane. The space between the cricoid and the isthmus often contains the levator glandulae thyroideae (if present). * **Option D:** While the isthmus does cover the 3rd and 4th rings, it traditionally begins higher at the 2nd ring. **NEET-PG High-Yield Pearls:** 1. **Tracheostomy Landmark:** During a formal surgical tracheostomy, the isthmus is often divided or retracted to gain access to the **2nd and 3rd or 3rd and 4th tracheal rings**. 2. **Pyramidal Lobe:** In about 40-50% of individuals, a small "pyramidal lobe" extends upward from the isthmus, usually to the left of the midline, representing a remnant of the **thyroglossal duct** [1]. 3. **Blood Supply:** The **Anterior branch of the Superior Thyroid Artery** anastomoses with its fellow from the opposite side along the upper border of the isthmus. 4. **Venous Drainage:** The **Inferior Thyroid Veins** emerge from the lower border of the isthmus and drain into the left brachiocephalic vein [2].

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.

Q: The upper border of the thyroid cartilage is at which vertebral level?

C5. The thyroid cartilage is the largest cartilage of the larynx. Its vertebral level is a high-yield anatomical landmark for NEET-PG. The **upper border of the thyroid cartilage** (and the thyroid notch) corresponds to the level of the **C4-C5 intervertebral disc** or the **C4/C5** vertebral level. In most standard anatomical texts, the thyroid cartilage spans from C4 to C5. **Analysis of Options:** * **C5 (Correct):** The upper border of the thyroid cartilage aligns with the C4-C5 level. This is also the critical point where the **Common Carotid Artery bifurcates** into the Internal and External Carotid arteries. * **C2:** This level corresponds to the **Axis** vertebra. The angle of the mandible and the superior cervical ganglion are located near this level, far above the thyroid cartilage. * **C6:** This is the level of the **lower border** of the cricoid cartilage. It marks the transition from the larynx to the trachea and the pharynx to the esophagus. * **T1:** This level corresponds to the apex of the lung and the superior thoracic aperture, well below the laryngeal structures. **High-Yield Clinical Pearls:** 1. **Hyoid Bone:** Located at the **C3** level. 2. **Cricoid Cartilage:** Located at the **C6** level (marks the end of the larynx). 3. **Carotid Bifurcation:** Occurs at the upper border of the thyroid cartilage (**C4-C5**). 4. **Isthmus of Thyroid Gland:** Overlies the **2nd, 3rd, and 4th tracheal rings** [1]. 5. **Emergency Airway:** A cricothyroidotomy is performed through the cricothyroid membrane, located between the thyroid (C4-C5) and cricoid (C6) cartilages.

Q: A lymph node biopsy is taken in the posterior triangle of the neck. What is the most likely nerve to be damaged?

Accessory nerve. **Explanation:** The **Spinal Accessory Nerve (CN XI)** is the most frequently injured nerve during surgical procedures in the posterior triangle of the neck, particularly during lymph node biopsies or radical neck dissections [1]. **Why the Accessory Nerve is the correct answer:** The nerve emerges from the posterior border of the Sternocleidomastoid muscle (at Erb’s point) and runs across the posterior triangle to supply the Trapezius [1]. In this region, it is located very superficially, lying just deep to the **investing layer of deep cervical fascia**. Its superficial position makes it highly vulnerable to accidental transection or traction injury during the excision of enlarged cervical lymph nodes. **Analysis of Incorrect Options:** * **Phrenic Nerve:** This nerve lies deep to the prevertebral fascia, resting on the anterior scalene muscle. It is protected by a thick layer of fascia and is located much deeper than the accessory nerve. * **Upper/Lower Brachial Plexus:** The roots and trunks of the brachial plexus emerge between the anterior and middle scalene muscles in the floor of the posterior triangle [1]. While they can be injured in deep penetrating trauma, they are generally protected by the prevertebral fascia during superficial biopsies. **NEET-PG High-Yield Pearls:** * **Clinical Presentation of Injury:** Drooping of the shoulder, inability to shrug (Trapezius paralysis), and difficulty abducting the arm above 90 degrees [1]. * **Surface Anatomy:** The nerve follows a line connecting a point 1/3rd the way down the posterior border of the Sternocleidomastoid to a point 2/3rd the way down the anterior border of the Trapezius. * **Safety Rule:** Any surgery in the "Carefree area" (upper part of the posterior triangle) must account for the Spinal Accessory Nerve.

Q: Which of the following statements regarding the sensory nerve supply of the pharyngeal mucous membrane is TRUE?

All of the above.. The sensory innervation of the pharynx is derived from the **pharyngeal plexus** and specific cranial nerve branches, following a distinct segmental distribution based on embryological origins. ### **Explanation of Options:** * **Nasopharynx (Option A):** The mucous membrane of the nasopharynx is primarily supplied by the **pharyngeal branch of the maxillary nerve (V2)**, which reaches the area via the pterygopalatine ganglion. * **Oropharynx (Option B):** The **glossopharyngeal nerve (CN IX)** provides sensory fibers to the oropharynx. It also forms the sensory limb of the **gag reflex**. * **Laryngopharynx (Option C):** The sensory supply to the laryngopharynx (hypopharynx) is provided by the **vagus nerve (CN X)**. Specifically, the **internal laryngeal nerve** (a branch of the superior laryngeal nerve) supplies the mucosa down to the level of the vocal folds. Since all three statements accurately describe the segmental sensory distribution, **Option D is correct.** ### **High-Yield NEET-PG Pearls:** 1. **Gag Reflex:** Sensory limb is the **Glossopharyngeal nerve (CN IX)**; Motor limb is the **Vagus nerve (CN X)**. 2. **Killian’s Dehiscence:** A potential gap between the thyropharyngeus and cricopharyngeus parts of the inferior constrictor; it is the most common site for **Zenker’s diverticulum**. 3. **Piriform Fossa:** Internal laryngeal nerve lies just deep to the mucous membrane here; foreign bodies (like fish bones) often lodge in this fossa. 4. **Tonsillar Bed:** The glossopharyngeal nerve is at risk during tonsillectomy as it lies deep to the superior constrictor muscle in the tonsillar fossa.

Question 1

The hyoid bone lies at the level of which cervical vertebra?

Accepted Answer

C3

Answer

C5

Answer

C7

Answer

T2

Question 2

A superficial cut in the posterior triangle of the neck will primarily affect which of the following movements?

Accepted Answer

Shrugging of the shoulder

Answer

Adduction of the arm

Answer

Pronation of the scapula

Answer

Abduction of the arm

Question 3

The isthmus of the thyroid gland overlies which tracheal cartilages?

Accepted Answer

The 2nd, 3rd, and 4th tracheal cartilages

Answer

The 1st tracheal cartilage

Answer

The 1st and 2nd tracheal cartilages

Answer

The 3rd and 4th tracheal cartilages

Question 4

The isthmus of the thyroid gland overlies which tracheal cartilages?

Accepted Answer

The 2nd, 3rd, and 4th tracheal cartilages

Answer

The 1st tracheal cartilage

Answer

The 1st and 2nd tracheal cartilages

Answer

The 3rd and 4th tracheal cartilages

Question 5

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 6

What is present in the retropharyngeal space?

Accepted Answer

Loose areolar tissue and lymph nodes

Answer

Platysma

Answer

Vertebrae

Answer

Hypoglossal nerve

Question 7

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

Question 8

The upper border of the thyroid cartilage is at which vertebral level?

Accepted Answer

C5

Answer

C2

Answer

C6

Answer

T1

Question 9

A lymph node biopsy is taken in the posterior triangle of the neck. What is the most likely nerve to be damaged?

Accepted Answer

Accessory nerve

Answer

Phrenic nerve

Answer

Upper brachial plexus

Answer

Lower brachial plexus

Question 10

Which of the following statements regarding the sensory nerve supply of the pharyngeal mucous membrane is TRUE?

Accepted Answer

All of the above.

Answer

Nasopharynx is supplied by the maxillary nerve.

Answer

Glossopharyngeal nerve innervates the oral pharynx.

Answer

Laryngeal pharynx is supplied by the internal laryngeal branch of the vagus nerve.

Neck — MCQs

Neck — MCQs

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