Neck — MCQs

Neck Indian Medical PG Practice Questions and MCQs

Question 201: All statements regarding the cervical part of the esophagus are true except?

A. Arises at the cricoid level
B. Is a site of portosystemic anastomosis (Correct Answer)
C. Foreign body obstruction is common at this level
D. Contains striated muscle fibers

Explanation: The cervical esophagus begins at the lower border of the cricoid cartilage (C6 level) and extends to the thoracic inlet (T1). **Why Option B is the Correct Answer (The False Statement):** While the esophagus is indeed a site of portosystemic anastomosis, this occurs specifically at the **lower (abdominal) end** of the esophagus, where the esophageal branches of the left gastric vein (portal) meet the esophageal branches of the azygos vein (systemic). The cervical part of the esophagus drains into the inferior thyroid veins, which are purely systemic; it has no involvement in portal circulation. **Analysis of Other Options:** * **Option A:** The esophagus begins at the level of the **cricoid cartilage (C6)**, where the pharynx ends. This is the narrowest part of the entire alimentary canal (excluding the appendix). * **Option B (Note):** Incorrect. * **Option C:** The pharyngoesophageal junction is the **first anatomical constriction** of the esophagus. Due to this narrowing and the presence of the cricopharyngeus muscle (sphincter), it is the most common site for foreign body impaction. * **Option D:** The muscularis externa of the esophagus follows a "rule of thirds." The **upper 1/3 (cervical part) consists entirely of striated (skeletal) muscle**, the middle 1/3 is mixed, and the lower 1/3 is smooth muscle. **High-Yield NEET-PG Pearls:** * **Nerve Supply:** Recurrent laryngeal nerves lie in the tracheoesophageal grooves on both sides. * **Killian’s Dehiscence:** A weak muscular area between the thyropharyngeus and cricopharyngeus muscles, prone to Zenker’s diverticulum. * **Length:** The cervical esophagus is approximately 4–5 cm long.

Question 202: Which muscle is innervated by a branch of the ansa cervicalis?

A. Sternocleidomastoid
B. Platysma
C. Sternohyoid (Correct Answer)
D. Trapezius

Explanation: **Explanation:** The **Ansa Cervicalis** is a loop of nerves from the cervical plexus (C1–C3) located in the carotid triangle. Its primary function is to provide motor innervation to the **infrahyoid muscles** (also known as "strap muscles"). **1. Why Sternohyoid is Correct:** The ansa cervicalis supplies three out of the four infrahyoid muscles: the **Sternohyoid**, **Sternothyroid**, and **Omohyoid**. * The **superior root** (C1 via the hypoglossal nerve) supplies the superior belly of the omohyoid. * The **inferior root** (C2–C3) joins to form the loop, which then gives branches to the sternohyoid, sternothyroid, and inferior belly of the omohyoid. **2. Why the other options are incorrect:** * **Sternocleidomastoid (A) & Trapezius (D):** Both are supplied by the **Spinal Accessory Nerve (CN XI)** for motor function and branches of the cervical plexus (C2–C3/C3–C4) for proprioception. * **Platysma (B):** This is a muscle of facial expression located in the superficial fascia of the neck; it is innervated by the **Cervical branch of the Facial Nerve (CN VII)**. **3. High-Yield Clinical Pearls for NEET-PG:** * **The "Rule of Four":** The ansa cervicalis supplies 3 strap muscles (Sternohyoid, Sternothyroid, Omohyoid). The **fourth** strap muscle, the **Thyrohyoid**, is supplied by **C1 fibers** traveling directly with the Hypoglossal nerve (not via the ansa loop). * **Geniohyoid:** Also supplied by C1 via the Hypoglossal nerve. * **Surgical Landmark:** The ansa cervicalis is usually found embedded in the anterior wall of the **carotid sheath**, superficial to the internal jugular vein.

Question 203: In the given cross-section of the deep cervical fascia, which of the following statements is NOT true?

A. Axillary sheath is derived from the prevertebral fascia.
B. The parotid sheath is derived from the superficial layer of deep cervical fascia.
C. The superficial layer of deep cervical fascia represents the pretracheal fascia. (Correct Answer)
D. The investing layer of deep cervical fascia covers the trapezius and sternocleidomastoid muscles.

Explanation: ***The superficial layer of deep cervical fascia represents the pretracheal fascia*** - This statement is **FALSE** - the **superficial layer** of deep cervical fascia is the **investing layer**, not the pretracheal fascia. - The **pretracheal fascia** is actually the **middle layer** of deep cervical fascia, which encloses the **thyroid gland**, **trachea**, and **esophagus**. *Axillary sheath is derived from the prevertebral fascia* - This statement is **TRUE** - the **axillary sheath** extends from the **prevertebral fascia** and surrounds the **brachial plexus** and **axillary vessels**. - The **prevertebral fascia** is the **deepest layer** of deep cervical fascia covering the **vertebral bodies** and **deep neck muscles**. *The parotid sheath is derived from the superficial layer of deep cervical fascia* - This statement is **TRUE** - the **investing layer** (superficial layer) splits to form the **parotid sheath** around the **parotid gland**. - The **investing layer** also gives rise to the **masseteric fascia** and **pterygoid fascia** in this region. *The investing layer of deep cervical fascia covers the trapezius and sternocleidomastoid muscles* - This statement is **TRUE** - the **investing layer** is the most superficial layer that encloses the **trapezius** and **sternocleidomastoid muscles**. - It forms a complete collar around the neck, extending from the **nuchal line** posteriorly to the **mandible** and **hyoid bone** anteriorly.

Question 204: All of the following structures are found in the posterior triangle of the neck except one. Which one is the exception?

A. External jugular vein
B. Subclavian vein
C. Hypoglossal nerve (Correct Answer)
D. Phrenic nerve

Explanation: **Explanation:** The **posterior triangle of the neck** is bounded by the sternocleidomastoid (anteriorly), trapezius (posteriorly), and the middle third of the clavicle (inferiorly). **Why Hypoglossal Nerve is the exception:** The **Hypoglossal nerve (CN XII)** is primarily located in the **anterior triangle**, specifically within the submandibular (digastric) and carotid triangles. It crosses the lateral surface of the internal and external carotid arteries but does not enter the posterior triangle. Therefore, it is the correct exception. **Analysis of other options:** * **External Jugular Vein (A):** This is a superficial structure that descends vertically across the sternocleidomastoid to enter the posterior triangle, where it pierces the investing layer of deep cervical fascia to drain into the subclavian vein. * **Subclavian Vein (B):** It lies in the lower part of the posterior triangle, passing anterior to the scalenus anterior muscle. * **Phrenic Nerve (D):** Formed by the C3-C5 nerve roots, it descends on the anterior surface of the **scalenus anterior** muscle, which forms part of the floor of the posterior triangle. **High-Yield NEET-PG Pearls:** 1. **Contents of the Floor:** Formed by the Splenius capitis, Levator scapulae, and Scalene muscles (Medius and Posterior). 2. **Spinal Accessory Nerve (CN XI):** This is the most important nerve crossing the posterior triangle; it is superficial and highly vulnerable to injury during lymph node biopsies. 3. **Erb’s Point:** Located at the midpoint of the posterior border of the sternocleidomastoid, where four cutaneous branches of the cervical plexus emerge (Great auricular, Lesser occipital, Transverse cervical, and Supraclavicular nerves).

Question 205: Which of the following is NOT a suprahyoid muscle?

A. Omohyoid (Correct Answer)
B. Mylohyoid
C. Geniohyoid
D. Digastric

Explanation: The muscles of the neck are primarily categorized based on their relationship to the hyoid bone into **Suprahyoid** and **Infrahyoid** groups. ### 1. Why Omohyoid is the Correct Answer The **Omohyoid** is an **Infrahyoid muscle** (also known as "strap muscles"). These muscles are located inferior to the hyoid bone and function to depress it during swallowing and speech. The Omohyoid is unique because it consists of two bellies (superior and inferior) connected by an intermediate tendon, extending from the scapula to the hyoid bone. ### 2. Analysis of Incorrect Options (Suprahyoid Muscles) The suprahyoid muscles are located superior to the hyoid bone and function to elevate it. * **Mylohyoid (B):** Forms the floor of the oral cavity; it is a classic suprahyoid muscle. * **Geniohyoid (C):** Located superior to the mylohyoid, it pulls the hyoid bone anterosuperiorly. * **Digastric (D):** Like the omohyoid, it has two bellies (anterior and posterior), but it is located above the hyoid, making it a suprahyoid muscle. ### 3. High-Yield Clinical Pearls for NEET-PG * **Mnemonic for Suprahyoid Muscles:** "**M**y **G**ravy **S**ays **D**elicious" (**M**ylohyoid, **G**eniohyoid, **S**tylohyoid, **D**igastric). * **Mnemonic for Infrahyoid Muscles:** "**TOSS**" (**T**hyrohyoid, **O**mohyoid, **S**ternohyoid, **S**ternothyroid). * **Innervation Fact:** All infrahyoid muscles are supplied by the **Ansa Cervicalis (C1-C3)**, *except* the Thyrohyoid, which is supplied by C1 via the Hypoglossal nerve. * **Digastric Nerve Supply:** This is a frequent exam favorite—the Anterior belly is supplied by the Nerve to Mylohyoid (CN V3), while the Posterior belly is supplied by the Facial Nerve (CN VII).

Question 206: At what level does the common carotid artery typically bifurcate?

A. The superior border of the thyroid cartilage (Correct Answer)
B. The cricoid cartilage
C. The level of the T4 vertebra
D. The level of the T2 vertebra

Explanation: ### Explanation The **Common Carotid Artery (CCA)** is a vital vascular structure in the neck. On the right, it originates from the brachiocephalic trunk, and on the left, directly from the aortic arch. **1. Why Option A is Correct:** The CCA ascends within the carotid sheath and typically bifurcates into the **Internal Carotid Artery (ICA)** and **External Carotid Artery (ECA)** 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 body of the **C4 vertebra**. This bifurcation point is marked by the **carotid sinus** (a baroreceptor) and the **carotid body** (a chemoreceptor). **2. Why the Other Options are Incorrect:** * **Option B (Cricoid Cartilage):** This corresponds to the **C6 level**. It is a landmark for the beginning of the trachea and esophagus, the entry of the vertebral artery into the foramen transversarium, and where the omohyoid muscle crosses the CCA. * **Option C (T4 Vertebra):** This is the level of the **Sternal Angle (Angle of Louis)**. It marks the bifurcation of the trachea and the beginning/end of the arch of the aorta, not the carotid bifurcation. * **Option D (T2 Vertebra):** This level corresponds to the suprasternal notch and the origin of the great vessels from the aortic arch. **High-Yield Clinical Pearls for NEET-PG:** * **Carotid Sinus:** Located at the bifurcation; innervated by the **Glossopharyngeal nerve (CN IX)**; sensitive to pressure changes. * **Surface Anatomy:** The bifurcation can be palpated just anterior to the sternocleidomastoid muscle at the level of the hyoid bone/thyroid cartilage. * **Safe Zone:** In carotid endarterectomy, the bifurcation is the primary site of atherosclerotic plaque formation.

Question 207: Which of the following is NOT an extrinsic membrane of the larynx?

A. Cricothyroid membrane (Correct Answer)
B. Thyrohyoid membrane
C. Hyoepiglottic ligament
D. Cricotracheal membrane

Explanation: The membranes and ligaments of the larynx are divided into two categories: **Extrinsic** and **Intrinsic**. ### 1. Why Cricothyroid Membrane is the Correct Answer The **Cricothyroid membrane** (specifically the conus elasticus) is an **intrinsic membrane**. Intrinsic membranes connect the individual laryngeal cartilages to *each other* and are responsible for the internal structural integrity of the larynx. The cricothyroid membrane connects the cricoid cartilage to the thyroid and arytenoid cartilages. ### 2. Analysis of Incorrect Options (Extrinsic Membranes) Extrinsic membranes connect the laryngeal cartilages to *outside structures* (like the hyoid bone or trachea): * **Thyrohyoid membrane:** Connects the thyroid cartilage to the **hyoid bone**. It is pierced by the internal laryngeal nerve and superior laryngeal artery. * **Hyoepiglottic ligament:** Connects the epiglottis to the **hyoid bone**. * **Cricotracheal membrane:** Connects the cricoid cartilage to the **first tracheal ring**. ### 3. High-Yield NEET-PG Pearls * **Intrinsic Membranes:** There are two main intrinsic membranes: the **Quadrangular membrane** (upper part) and the **Cricovocal membrane/Conus elasticus** (lower part). * **Vocal Ligament:** The free upper border of the cricovocal membrane forms the vocal ligament (true vocal cord). * **Vestibular Ligament:** The free lower border of the quadrangular membrane forms the vestibular ligament (false vocal cord). * **Clinical Correlation:** In emergency airway management, a **Cricothyroidotomy** is performed by incising the cricothyroid membrane to establish an airway below the level of the vocal cords.

Question 208: All of the following are structures found in the anterior triangle of the neck EXCEPT:

A. Digastric muscle
B. Subclavian artery (Correct Answer)
C. Muscular triangle contents
D. Submental triangle contents

Explanation: Explanation: The neck is divided into two major triangles by the **Sternocleidomastoid (SCM) muscle**: the Anterior Triangle (anterior to SCM) and the Posterior Triangle (posterior to SCM). **Why Option B is Correct:** The **Subclavian artery** is a major structure of the **Posterior Triangle**. Specifically, the third part of the subclavian artery is found in the **Supraclavicular (Omoclavicular) triangle**, which is the lower subdivision of the posterior triangle. The first and second parts are located deep to the SCM and scalenus anterior, but they do not enter the anterior triangle. **Analysis of Incorrect Options:** * **A. Digastric muscle:** Both the anterior and posterior bellies of the digastric muscle are key landmarks in the anterior triangle. The posterior belly forms the boundary between the Carotid and Digastric triangles. * **C. Muscular triangle contents:** This is a subdivision of the anterior triangle. It contains the infrahyoid "strap" muscles (sternohyoid, sternothyroid) and the thyroid/parathyroid glands. * **D. Submental triangle contents:** This is a midline subdivision of the anterior triangle located between the two anterior bellies of the digastric muscles. It contains submental lymph nodes and small veins. **NEET-PG High-Yield Pearls:** * **Boundaries of Anterior Triangle:** Anterior border of SCM, midline of the neck, and lower border of the mandible. * **Subdivisions:** Digastric (Submandibular), Carotid, Muscular, and Submental triangles. * **Key Content:** The **Common Carotid Artery** bifurcates into Internal and External Carotid arteries within the Carotid triangle (part of the anterior triangle). * **Posterior Triangle Contents:** Subclavian artery (3rd part), Brachial plexus (trunks), Spinal accessory nerve (CN XI), and EJV.

Question 209: Which vein connects the External and Internal Jugular vein?

A. Posterior External Jugular vein
B. Oblique Jugular vein (Correct Answer)
C. Anterior Jugular vein
D. Transverse cervical vein

Explanation: ### Explanation The **Oblique Jugular vein** (also known as the vein of Kocher) is a small, inconsistent vein that descends across the superficial surface of the sternocleidomastoid muscle. It serves as a direct communication channel, draining from the **Internal Jugular Vein (IJV)** into the **External Jugular Vein (EJV)**. #### Analysis of Options: * **Oblique Jugular vein (Correct):** It is the specific anatomical bridge between the IJV and EJV. It is often considered a remnant of the primitive cephalic vein system. * **Posterior External Jugular vein:** This vein drains the skin and superficial muscles of the back of the scalp and neck, eventually emptying into the EJV. It does not connect to the IJV. * **Anterior Jugular vein:** This vein begins near the hyoid bone and descends in the anterior neck. It usually drains into the EJV or the subclavian vein, but it does not serve as a primary connection between the IJV and EJV. * **Transverse cervical vein:** This is a tributary that typically drains into the EJV. It carries blood from the trapezius and surrounding structures but is not a connecting vessel to the IJV. #### NEET-PG High-Yield Pearls: * **EJV Formation:** Formed by the union of the **Posterior division of the Retromandibular vein** and the **Posterior Auricular vein**. * **IJV Formation:** It is a continuation of the **Sigmoid sinus** at the jugular foramen. * **Clinical Significance:** The Oblique Jugular vein can be a source of unexpected bleeding during superficial neck dissections or when performing central venous pressure (CVP) manometry via the EJV. * **Surface Anatomy:** The EJV crosses the Sternocleidomastoid muscle obliquely, while the Oblique Jugular vein crosses it to link the deep and superficial systems.

Question 210: Which structure can be felt at the inferior part of the medial border of the sternocleidomastoid muscle?

A. Subclavian artery
B. Common carotid artery (Correct Answer)
C. Internal mammary artery
D. Maxillary artery

Explanation: ### Explanation **Correct Answer: B. Common carotid artery** The **Common Carotid Artery (CCA)** is the primary vascular structure located within the carotid sheath, situated deep to the **medial border of the sternocleidomastoid (SCM) muscle**. In the lower part of the neck (the inferior portion of the SCM), the artery is relatively superficial before it bifurcates at the level of the upper border of the thyroid cartilage (C4). Clinicians use the medial border of the SCM as a landmark to palpate the carotid pulse or to perform internal jugular vein cannulation. **Analysis of Incorrect Options:** * **A. Subclavian artery:** This artery is located in the **supraclavicular fossa**, passing posterior to the scalenus anterior muscle. It is felt deep in the root of the neck, lateral to the SCM, rather than along its medial border. * **C. Internal mammary (Internal thoracic) artery:** This is a branch of the first part of the subclavian artery. It descends behind the costal cartilages inside the thoracic cage and is not palpable in the neck. * **D. Maxillary artery:** This is a terminal branch of the external carotid artery located within the **infratemporal fossa**. It is deep to the mandible and far superior to the inferior border of the SCM. **High-Yield Clinical Pearls for NEET-PG:** * **Chassaignac’s Tubercle:** The CCA can be compressed against the prominent anterior tubercle of the **C6 transverse process** (Chassaignac’s tubercle) to control bleeding. * **Carotid Triangle:** The CCA bifurcates within the carotid triangle, which is bounded by the superior belly of the omohyoid, the posterior belly of the digastric, and the anterior (medial) border of the SCM. * **Surface Anatomy:** The CCA follows a line connecting the sternoclavicular joint to a point midway between the angle of the mandible and the mastoid process.

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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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