Neck — MCQs

Neck Indian Medical PG Practice Questions and MCQs

Question 291: The hyoid bone lies at the level of which cervical vertebra?

A. C3 (Correct Answer)
B. C5
C. C7
D. T2

Explanation: 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).

Question 292: A superficial cut in the posterior triangle of the neck will primarily affect which of the following movements?

A. Adduction of the arm
B. Pronation of the scapula
C. Shrugging of the shoulder (Correct Answer)
D. Abduction of the arm

Explanation: The **posterior triangle of the neck** is a high-yield anatomical region for NEET-PG. The correct answer is **Shrugging of the shoulder** because the **Spinal Accessory Nerve (CN XI)** runs a very superficial course within this triangle. **1. Why Shrugging of the Shoulder is Correct:** The Spinal Accessory Nerve enters the posterior triangle at the junction of the upper 1/3rd and middle 1/3rd of the posterior border of the Sternocleidomastoid muscle. It then crosses the floor of the triangle (lying on the levator scapulae) to reach the **Trapezius muscle**. Since the Trapezius is the primary muscle responsible for shrugging the shoulders (elevation of the scapula), a superficial cut in this region often severs CN XI, leading to paralysis of the Trapezius and loss of shrugging. **2. Why Other Options are Incorrect:** * **Adduction of the arm:** Primarily performed by the Pectoralis major and Latissimus dorsi, which are supplied by nerves from the brachial plexus (medial/lateral pectoral and thoracodorsal nerves) located deeper and more inferiorly [1]. * **Pronation of the scapula (Protraction):** This is the primary action of the **Serratus anterior**, supplied by the Long Thoracic Nerve. While this nerve originates in the neck, it is situated deeper and more lateral than the superficial CN XI. * **Abduction of the arm:** Initiated by the Supraspinatus and continued by the Deltoid. These are supplied by the Suprascapular and Axillary nerves, respectively, which are not as superficially vulnerable in the posterior triangle as CN XI. **Clinical Pearls for NEET-PG:** * **Superficiality:** CN XI is the only cranial nerve that runs superficial to the prevertebral fascia in the neck, making it highly susceptible to iatrogenic injury during lymph node biopsies. * **Clinical Sign:** Injury to CN XI leads to "drooping of the shoulder" and an inability to abduct the arm above 90 degrees (due to loss of scapular rotation by the Trapezius). * **Boundaries:** Remember that the posterior triangle is bounded by the Sternocleidomastoid (anterior), Trapezius (posterior), and Clavicle (inferior).

Question 293: The isthmus of the thyroid gland overlies which tracheal cartilages?

A. The 1st tracheal cartilage
B. The 1st and 2nd tracheal cartilages
C. The 2nd, 3rd, and 4th tracheal cartilages (Correct Answer)
D. The 3rd and 4th tracheal cartilages

Explanation: 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.

Question 294: The isthmus of the thyroid gland overlies which tracheal cartilages?

A. The 1st tracheal cartilage
B. The 1st and 2nd tracheal cartilages
C. The 2nd, 3rd, and 4th tracheal cartilages (Correct Answer)
D. The 3rd and 4th tracheal cartilages

Explanation: 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].

Question 295: Which of the following statements about the External Jugular vein is FALSE?

A. It is deep to Platysma
B. It is formed by the anterior division of the retromandibular vein and the posterior auricular vein (Correct Answer)
C. It crosses the Sternocleidomastoid muscle
D. It drains into the Subclavian vein

Explanation: The **External Jugular Vein (EJV)** is a superficial vein of the neck frequently tested in NEET-PG for its anatomical relations and formation. ### **Explanation of the Correct Answer (Option B)** Option B is **FALSE** because the EJV is formed by the union of the **posterior division** of the retromandibular vein and the **posterior auricular vein**. * **The Concept:** The retromandibular vein divides into anterior and posterior branches. The **anterior division** joins the facial vein to form the Common Facial Vein (which drains into the Internal Jugular Vein). The **posterior division** joins the posterior auricular vein to form the EJV. ### **Analysis of Other Options** * **Option A (True):** The EJV runs in the superficial fascia of the neck, situated **deep to the Platysma** muscle but superficial to the investing layer of deep cervical fascia. * **Option C (True):** It descends obliquely across the **Sternocleidomastoid (SCM)** muscle, running from the angle of the mandible to the middle of the clavicle. * **Option D (True):** After piercing the investing fascia in the posterior triangle, the EJV typically terminates by draining into the **Subclavian vein**. ### **High-Yield Clinical Pearls for NEET-PG** 1. **Surface Anatomy:** The EJV is the most visible vein in the neck; it becomes prominent during a Valsalva maneuver or in cases of **Right Heart Failure** (raised Jugular Venous Pressure). 2. **Air Embolism:** If the EJV is severed where it pierces the deep fascia, the fascia prevents the vein from collapsing. Due to negative intrathoracic pressure, air can be sucked into the venous system, leading to a fatal air embolism. 3. **Tributaries:** Remember the mnemonic **"PAST"**: **P**osterior external jugular, **A**nterior jugular, **S**uprascapular, and **T**ransverse cervical veins.

Question 296: What is present in the retropharyngeal space?

A. Platysma
B. Loose areolar tissue and lymph nodes (Correct Answer)
C. Vertebrae
D. Hypoglossal nerve

Explanation: ### Explanation The **retropharyngeal space** is a potential space located behind the pharynx. It is bounded anteriorly by the **buccopharyngeal fascia** (covering the constrictor muscles) and posteriorly by the **prevertebral fascia** (specifically the alar layer). **1. Why the Correct Answer is Right:** The retropharyngeal space contains **loose areolar tissue** and the **Retropharyngeal Lymph Nodes (Nodes of Rouviere)**. These nodes are clinically significant as they drain the nasopharynx, auditory tube, and posterior ethmoid sinuses. In children, these nodes are prominent but typically atrophy before puberty, which is why retropharyngeal abscesses are more common in the pediatric population. **2. Why the Other Options are Incorrect:** * **A. Platysma:** This is a superficial muscle of facial expression located within the **superficial fascia** of the neck, far anterior to the retropharyngeal space. * **C. Vertebrae:** The cervical vertebrae lie posterior to the **prevertebral fascia**. While the retropharyngeal space is in front of the vertebrae, the bones themselves are located in the prevertebral space, not the retropharyngeal space. * **D. Hypoglossal nerve:** This nerve (CN XII) travels within the **carotid sheath** and the submandibular region; it does not traverse the midline retropharyngeal space. **3. NEET-PG High-Yield Clinical Pearls:** * **"Danger Space":** Located immediately posterior to the retropharyngeal space (between the alar and prevertebral fascia). It provides a direct conduit for infections to spread from the base of the skull down into the **posterior mediastinum**. * **Clinical Presentation:** A retropharyngeal abscess often presents with "hot potato voice," dysphagia, and neck stiffness. On a lateral X-ray, look for **widening of the prevertebral soft tissue shadow** (normally <7mm at C2). * **Boundaries:** Superiorly, it reaches the base of the skull; inferiorly, it extends to the superior mediastinum (level of T4/bifurcation of trachea).

Question 297: All of the following are branches of the thyrocervical trunk except?

A. Inferior thyroid artery
B. Suprascapular artery
C. Superficial cervical artery
D. Superior thyroid artery (Correct Answer)

Explanation: 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 298: The upper border of the thyroid cartilage is at which vertebral level?

A. C2
B. C5 (Correct Answer)
C. C6
D. T1

Explanation: 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.

Question 299: A lymph node biopsy is taken in the posterior triangle of the neck. What is the most likely nerve to be damaged?

A. Phrenic nerve
B. Accessory nerve (Correct Answer)
C. Upper brachial plexus
D. Lower brachial plexus

Explanation: **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.

Question 300: Which of the following statements regarding the sensory nerve supply of the pharyngeal mucous membrane is TRUE?

A. Nasopharynx is supplied by the maxillary nerve.
B. Glossopharyngeal nerve innervates the oral pharynx.
C. Laryngeal pharynx is supplied by the internal laryngeal branch of the vagus nerve.
D. All of the above. (Correct Answer)

Explanation: 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.

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Cervical Fascia

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Triangles of the Neck

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Deep Structures of the Neck

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Thyroid and Parathyroid Glands

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Vasculature of the Neck

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Lymphatic Drainage

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Cervical Plexus

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Root of the Neck

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Applied Anatomy and Clinical Correlations

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Surface Anatomy of the Neck

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