Neck Practice Questions

Q: Which of the following muscle is not innervated by the nerve shown in the image?

Thyrohyoid. ***Thyrohyoid*** - The **thyrohyoid muscle** is unique among the infrahyoid muscles as it is innervated directly by the **hypoglossal nerve (CN XII)** via a branch that contains fibers from the **C1 spinal nerve**. - Unlike the other infrahyoid muscles, which receive innervation from the **ansa cervicalis** (C1-C3), the thyrohyoid receives its motor supply independently via the hypoglossal nerve pathway. *Omohyoid* - The **omohyoid muscle** (both superior and inferior bellies) is innervated by the **ansa cervicalis**. - It belongs to the group of infrahyoid muscles responsible for depressing the hyoid bone during swallowing and speech. *Sternohyoid* - The **sternohyoid muscle** is a superficial infrahyoid muscle innervated by the **ansa cervicalis**. - It works to depress the hyoid bone, helping to stabilize it during activities such as speaking and deglutition. *Sternothyroid* - The **sternothyroid muscle** is an infrahyoid muscle that is also innervated by the **ansa cervicalis**. - It serves to depress the larynx (thyroid cartilage) following elevation during the act of swallowing.

Q: A neonate is noted at birth to have a small jaw, cleft palate, and glossoptosis causing airway obstruction. A clinical geneticist suspects a defect involving the first pharyngeal arch during the fourth week of embryonic development. The cartilaginous element of the affected arch that normally forms two specific middle ear ossicles is which of the following?

Meckel's cartilage, giving rise to the malleus and incus. ***A. Meckel's cartilage, giving rise to the malleus and incus*** - The clinical triad of **micrognathia** (small jaw), **glossoptosis**, and **cleft palate** defines **Pierre Robin sequence**, which is associated with underdevelopment of the **first pharyngeal arch** structures. Pierre Robin sequence arises from heterogeneous causes and is not uniformly the result of a single defective neural crest migration event. - **Meckel's cartilage** is the cartilaginous component of the first arch, and its proximal parts ossify to form the **malleus** and **incus** of the middle ear. *B. Reichert's cartilage, giving rise to the stapes and styloid process* - This cartilage is derived from the **second pharyngeal arch** (hyoid arch) and gives rise to the **stapes**, styloid process, and lesser horn of the hyoid. - Defects in the second arch would not result in the mandibular hypoplasia (micrognathia) or palatal defects seen in this patient. *C. The hyoid cartilage, giving rise to the body and lesser horns of the hyoid* - The **lesser horn** and upper part of the hyoid body come from the **second arch**, while the **greater horn** and lower body come from the **third arch**. - While the hyoid is associated with upper airway support, it is not the primary structure involved in the skeletal defects of **Pierre Robin sequence**. *D. The ala temporalis cartilage, giving rise to the greater wing of the sphenoid* - The **ala temporalis** contributes to the formation of the **greater wing of the sphenoid** via endochondral ossification. - It is a part of the neurocranium/chondrocranium and does not form the middle ear ossicles or the primary elements of the **first pharyngeal arch**.

Q: Level III neck nodes are located in which region?

Around the middle one-third of the internal jugular vein. The cervical lymph nodes are classified into levels (I–VII) based on their anatomical relationship to specific landmarks, primarily the Sternocleidomastoid (SCM) muscle and the Internal Jugular Vein (IJV) [2]. **Level III (Middle Deep Cervical Nodes)** refers to the lymph nodes located around the **middle one-third of the internal jugular vein**. Its boundaries are: * **Superior:** The horizontal plane of the hyoid bone [2]. * **Inferior:** The horizontal plane of the lower border of the cricoid cartilage. * **Anterior:** The lateral border of the sternohyoid muscle. * **Posterior:** The posterior border of the SCM muscle. **Analysis of Incorrect Options:** * **A. Submental triangle:** This corresponds to **Level IA**. Level IB refers to the submandibular triangle. * **B. Posterior triangle:** This corresponds to **Level V**, bounded by the posterior border of the SCM, the anterior border of the trapezius, and the clavicle. * **C. Midline from hyoid to suprasternal notch:** This corresponds to **Level VI** (Anterior compartment nodes), which includes the pre-tracheal, para-tracheal, and precricoid (Delphian) nodes [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Level II:** Upper deep cervical nodes (Hyoid to Skull base). Contains the **Jugulodigastric node**, which is the main node for the palatine tonsil. * **Level III:** Contains the **Jugulo-omohyoid node**, often involved in cancers of the tongue and larynx. * **Level IV:** Lower deep cervical nodes (Cricoid to Clavicle). * **Virchow’s Node:** Located in the left supraclavicular fossa (part of Level V), often the first sign of gastric malignancy (Troisier’s sign). * **Surgical Landmark:** The **Omohyoid muscle** (superior belly) crosses the IJV and serves as a landmark separating Level III from Level IV.

Q: A 10-year-old child suddenly choked while consuming food. After a failed Valsalva's maneuver, a needle cricothyrotomy was performed. Into which of the following regions would this procedure open?

Infraglottic cavity. **Explanation:** The **cricothyroid membrane** (conus elasticus) is located between the lower border of the thyroid cartilage and the upper border of the cricoid cartilage. A needle cricothyrotomy involves piercing this membrane to establish an emergency airway. **1. Why the Infraglottic Cavity is Correct:** The interior of the larynx is divided into three parts by the vestibular and vocal folds. The **infraglottic cavity** (subglottis) is the lowermost part, extending from the vocal folds to the lower border of the cricoid cartilage (where it becomes continuous with the trachea). Since the cricothyroid membrane lies immediately below the vocal folds, any instrument piercing it enters directly into the infraglottic cavity. **2. Analysis of Incorrect Options:** * **Rima Glottidis:** This is the narrow triangular fissure between the two vocal folds. It is the boundary between the upper and lower respiratory tracts, not a cavity itself. * **Laryngeal Vestibule:** This is the upper part of the laryngeal cavity, located between the laryngeal inlet and the vestibular folds (false vocal cords). It is situated well above the cricothyroid membrane. * **Laryngeal Ventricle:** Also known as the sinus of the larynx, this is a small lateral recess between the vestibular fold (above) and the vocal fold (below). It is superior to the site of a cricothyrotomy. **Clinical Pearls for NEET-PG:** * **Emergency Airway:** Cricothyrotomy is preferred over tracheostomy in acute emergencies because the cricothyroid membrane is subcutaneous, easily palpable, and relatively avascular. * **Landmark:** The cricoid cartilage is the only complete cartilaginous ring in the airway and corresponds to the **C6 vertebral level**. * **Safety:** The procedure is performed below the vocal cords, thus avoiding damage to the vocal apparatus if performed correctly.

Q: An 18-year-old female passenger injured in a rollover car crash was rushed to the emergency department. After the patient is stabilized, she demonstrates considerable weakness in her ability to flex her neck, associated with injury to CN XI. Which of the following muscles is most probably affected by nerve trauma?

Sternocleidomastoid. The clinical presentation describes a patient with weakness in **neck flexion** and injury to **Cranial Nerve XI (Spinal Accessory Nerve)**. 1. **Why Sternocleidomastoid (SCM) is correct:** The Spinal Accessory Nerve (CN XI) provides motor innervation to two major muscles: the **Sternocleidomastoid** and the **Trapezius**. The SCM has two heads (sternal and clavicular); when both sides contract simultaneously (bilateral action), they **flex the neck**. Unilateral contraction causes lateral flexion to the same side and rotation of the face to the opposite side. Therefore, trauma to CN XI directly results in weakness of neck flexion due to SCM paralysis. 2. **Why the other options are incorrect:** * **Iliocostalis thoracis (A):** This is a member of the erector spinae group. Its primary function is extension of the vertebral column, not flexion, and it is innervated by the posterior rami of spinal nerves. * **Rhomboid major (C) and Rhomboid minor (D):** These muscles act on the scapula (retraction and elevation). They are located in the back and are innervated by the **Dorsal Scapular Nerve (C5)**, not CN XI. **High-Yield NEET-PG Pearls:** * **Course of CN XI:** It enters the skull through the Foramen Magnum and exits via the **Jugular Foramen**. * **Clinical Testing:** To test the SCM, ask the patient to turn their head against resistance. To test the Trapezius, ask the patient to shrug their shoulders. * **Surface Anatomy:** CN XI is highly vulnerable to injury in the **posterior triangle** of the neck during procedures like lymph node biopsies or internal jugular vein cannulation. * **Torticolis:** A clinical condition involving spasmodic contraction of the SCM.

Q: All are supplied by the Ansa cervicalis except:

Thyrohyoid. The **Ansa cervicalis** is a loop of nerves from the cervical plexus (C1–C3) that supplies the infrahyoid ("strap") muscles. Understanding its specific innervation pattern is high-yield for NEET-PG. ### **Why Thyrohyoid is the Correct Answer** While the Thyrohyoid is an infrahyoid muscle, it is **not** supplied by the Ansa cervicalis loop itself. Instead, it is supplied by the **nerve to thyrohyoid**, which consists of fibers from the **C1 ventral ramus** that travel briefly with the **Hypoglossal nerve (CN XII)** before branching off. Therefore, it is technically a C1 innervation via CN XII, distinct from the Ansa cervicalis. ### **Analysis of Incorrect Options** The Ansa cervicalis is formed by two roots: the *Superior root* (C1) and the *Inferior root* (C2, C3). It supplies: * **Sternohyoid (Option C):** Supplied by the Ansa cervicalis. * **Sternothyroid (Option B):** Supplied by the Ansa cervicalis. * **Omohyoid (Option D):** Both the superior and inferior bellies are supplied by the Ansa cervicalis. ### **High-Yield NEET-PG Pearls** 1. **The "C1 Exception":** Two muscles are supplied by C1 fibers traveling with the Hypoglossal nerve: the **Thyrohyoid** and the **Geniohyoid**. 2. **Superior Root:** Formerly called *descendens hypoglossi* (though it contains no CN XII fibers). 3. **Inferior Root:** Formerly called *descendens cervicalis*. 4. **Location:** The Ansa cervicalis is typically found embedded in the anterior wall of the **carotid sheath**, superficial to the internal jugular vein. This is a common landmark in neck dissections.

Q: Which of the following is the only intrinsic muscle of the larynx that lies outside the laryngeal framework?

Cricothyroid. The **Cricothyroid** muscle is unique among the intrinsic muscles of the larynx. While all other intrinsic muscles are located deep to the thyroid cartilage (within the laryngeal framework), the cricothyroid is situated on the **external surface** of the larynx, spanning between the cricoid and thyroid cartilages [1]. **Key Distinctions of the Cricothyroid:** 1. **Location:** It is the only intrinsic muscle located externally. 2. **Innervation:** It is the only intrinsic muscle supplied by the **External Laryngeal Nerve** (a branch of the Superior Laryngeal Nerve). All others are supplied by the Recurrent Laryngeal Nerve (RLN) [1]. 3. **Function:** It acts as the primary **tensor of the vocal cords** by tilting the thyroid cartilage forward. **Analysis of Incorrect Options:** * **Superior Constrictor:** This is a muscle of the pharynx, not an intrinsic muscle of the larynx. It forms the upper part of the pharyngeal wall. * **Cricopharyngeus:** This is the lower part of the Inferior Constrictor muscle. It acts as the upper esophageal sphincter and is not an intrinsic laryngeal muscle. * **Lateral Cricoarytenoid:** (Note: Option D mentions "Lateral cricothyroid," likely a distractor for Lateral Cricoarytenoid). The Lateral Cricoarytenoid is an intrinsic muscle located **inside** the laryngeal framework and is the primary adductor of the vocal cords. **NEET-PG High-Yield Pearls:** * **Safety Muscle of Larynx:** Posterior Cricoarytenoid (the only abductor of the vocal cords). * **Nerve Injury:** Damage to the External Laryngeal Nerve (often during thyroid surgery) results in a **weak, husky voice** and loss of high-pitched notes due to cricothyroid paralysis [1]. * **All intrinsic muscles** are supplied by the Recurrent Laryngeal Nerve **EXCEPT** the Cricothyroid [1].

Q: The axillary sheath is an extension of which fascial layer?

Prevertebral layer of deep cervical fascia. Explanation: The **axillary sheath** is a dense, fibrous sleeve that encloses the axillary artery, axillary vein, and the cords of the brachial plexus. It is formed as a lateral extension of the **prevertebral layer of the deep cervical fascia**. **Why the correct answer is right:** As the roots of the brachial plexus and the subclavian artery emerge from the space between the scalenus anterior and scalenus medius muscles, they "push" the overlying prevertebral fascia outward. This fascia follows these structures into the apex of the axilla, forming a tubular sheath. This anatomical continuity is the reason why a local anesthetic injected into the axillary sheath can track superiorly toward the cervical region. **Why the other options are incorrect:** * **Pretracheal fascia:** This layer encloses the viscera of the neck (trachea, esophagus, and thyroid gland). It blends inferiorly with the fibrous pericardium in the thorax but does not extend into the axilla. * **Investing layer:** This is the most superficial layer of deep cervical fascia that splits to enclose the Trapezius and Sternocleidomastoid muscles. It does not form the axillary sheath. **High-Yield Clinical Pearls for NEET-PG:** * **Brachial Plexus Block:** The axillary sheath is the anatomical basis for the "Axillary Block." Because the sheath is a continuous compartment, injecting anesthesia inside it allows the fluid to bathe the cords of the brachial plexus. * **Contents:** The sheath contains the axillary artery and the brachial plexus cords [1]. Note that the **axillary vein** lies mostly *outside* or in the medial compartment of the sheath, allowing it to distend during increased venous return [1]. * **Carotid Sheath vs. Axillary Sheath:** While the axillary sheath is derived from prevertebral fascia, the carotid sheath is formed by contributions from all three layers (investing, pretracheal, and prevertebral).

Q: Which part of the subclavian artery is affected by stenosis?

First part. ***First part*** - The **first part** of the subclavian artery is most commonly affected by **atherosclerotic stenosis** due to its location proximal to major branch points where turbulent flow occurs. - Stenosis here can lead to **subclavian steal syndrome**, where blood flows retrograde through the vertebral artery to supply the affected arm. *Second part* - The **second part** lies posterior to the **anterior scalene muscle** and is less commonly affected by stenosis. - This segment has fewer **branch points** and experiences less turbulent blood flow compared to the first part. *Third part* - The **third part** extends from the lateral border of the anterior scalene to the **first rib** and is rarely affected by stenosis. - This distal segment has the **smoothest flow dynamics** and minimal branching, making atherosclerotic changes uncommon. *All parts are equally affected* - **Atherosclerotic stenosis** shows a clear predilection for the **first part** rather than equal distribution. - The **hemodynamic stress** and **branching pattern** make the first part most vulnerable to plaque formation.

Question 1

Which of the following muscle is not innervated by the nerve shown in the image?

Accepted Answer

Thyrohyoid

Answer

Omohyoid

Answer

Sternohyoid

Answer

Sternothyroid

Question 2

A neonate is noted at birth to have a small jaw, cleft palate, and glossoptosis causing airway obstruction. A clinical geneticist suspects a defect involving the first pharyngeal arch during the fourth week of embryonic development. The cartilaginous element of the affected arch that normally forms two specific middle ear ossicles is which of the following?

Accepted Answer

Meckel's cartilage, giving rise to the malleus and incus

Answer

Reichert's cartilage, giving rise to the stapes and styloid process

Answer

The hyoid cartilage, giving rise to the body and lesser horns of the hyoid

Answer

The ala temporalis cartilage, giving rise to the greater wing of the sphenoid

Question 3

Contents of the suboccipital triangle are formed by all of the following structures, EXCEPT?

Accepted Answer

Lesser occipital nerve

Answer

Vertebral artery

Answer

Suboccipital nerve

Answer

Greater occipital nerve

Question 4

Level III neck nodes are located in which region?

Accepted Answer

Around the middle one-third of the internal jugular vein

Answer

Submental triangle

Answer

Posterior triangle

Answer

Midline from hyoid to suprasternal notch

Question 5

A 10-year-old child suddenly choked while consuming food. After a failed Valsalva's maneuver, a needle cricothyrotomy was performed. Into which of the following regions would this procedure open?

Accepted Answer

Infraglottic cavity

Answer

Rima glottidis

Answer

Laryngeal vestibule

Answer

Laryngeal ventricle

Question 6

An 18-year-old female passenger injured in a rollover car crash was rushed to the emergency department. After the patient is stabilized, she demonstrates considerable weakness in her ability to flex her neck, associated with injury to CN XI. Which of the following muscles is most probably affected by nerve trauma?

Accepted Answer

Sternocleidomastoid

Answer

Iliocostalis thoracis

Answer

Rhomboid major

Answer

Rhomboid minor

Question 7

All are supplied by the Ansa cervicalis except:

Accepted Answer

Thyrohyoid

Answer

Sternothyroid

Answer

Sternohyoid

Answer

Inferior belly of omohyoid

Question 8

Which of the following is the only intrinsic muscle of the larynx that lies outside the laryngeal framework?

Accepted Answer

Cricothyroid

Answer

Superior constrictor

Answer

Cricopharyngeus

Answer

Lateral cricothyroid

Question 9

The axillary sheath is an extension of which fascial layer?

Accepted Answer

Prevertebral layer of deep cervical fascia

Answer

Pretracheal fascia

Answer

Investing layer of deep cervical fascia

Answer

None of the above

Question 10

Which part of the subclavian artery is affected by stenosis?

Accepted Answer

First part

Answer

Second part

Answer

Third part

Answer

All parts are equally affected

Neck — MCQs

Neck — MCQs

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