Neck — MCQs

Neck Indian Medical PG Practice Questions and MCQs

Question 11: The hypoglossal nerve is anatomically related to which triangle of the neck?

A. Digastric triangle
B. Carotid triangle
C. Both Digastric and Carotid triangles (Correct Answer)
D. Neither Digastric nor Carotid triangles

Explanation: **Explanation:** The **Hypoglossal nerve (CN XII)** is a vital structure in the neck that provides motor innervation to the muscles of the tongue. Its anatomical course is unique as it traverses multiple subdivisions of the anterior triangle. 1. **Carotid Triangle:** After exiting the skull via the hypoglossal canal and descending between the internal jugular vein and internal carotid artery, the nerve enters the carotid triangle. Here, it loops around the occipital artery and crosses the internal and external carotid arteries superficially. 2. **Digastric (Submandibular) Triangle:** As it travels anteriorly, the nerve passes deep to the posterior belly of the digastric muscle to enter the digastric triangle. In this region, it lies on the surface of the hyoglossus muscle, superior to the greater horn of the hyoid bone, before entering the floor of the mouth. **Analysis of Options:** * **Option A & B:** These are partially correct but incomplete. The nerve is a key content of both spaces. * **Option C (Correct):** Accurately reflects the nerve’s transition from the vascular space (Carotid) to the suprahyoid region (Digastric). **High-Yield NEET-PG Pearls:** * **Pirogoff’s Triangle:** A small area within the digastric triangle where the hypoglossal nerve forms the superior boundary (useful for locating the lingual artery). * **Lesser’s Triangle:** Another surgical landmark where the nerve forms the base. * **Clinical Sign:** A lesion of the hypoglossal nerve leads to **ipsilateral atrophy** and **deviation of the tongue toward the side of the lesion** upon protrusion (due to the unopposed action of the contralateral genioglossus).

Question 12: The contents of the paralingual space do NOT include which of the following?

A. Hypoglossal nerve
B. Lingual artery (Correct Answer)
C. Lingual nerve
D. Submandibular gland

Explanation: The **paralingual space** (also known as the sublingual space) is a potential space located in the floor of the mouth, superior to the mylohyoid muscle and medial to the body of the mandible. ### Why Lingual Artery is the Correct Answer: The **lingual artery** is the primary vascular supply to the tongue, but it does **not** travel within the paralingual space. Instead, it runs **deep (medial) to the hyoglossus muscle**. The hyoglossus acts as a key anatomical landmark: structures lateral to it are in the paralingual space, while the lingual artery remains medial to it to reach the tip of the tongue. ### Analysis of Incorrect Options: * **Hypoglossal nerve (CN XII):** This nerve enters the paralingual space by passing lateral to the hyoglossus muscle to provide motor innervation to the tongue muscles. * **Lingual nerve:** A branch of the mandibular nerve (V3), it travels in the paralingual space, looping under the submandibular duct (Wharton’s duct) from lateral to medial. * **Submandibular gland:** Specifically, the **deep process** of the submandibular gland and its duct (Wharton’s duct) are major contents of this space as they wrap around the posterior border of the mylohyoid. ### High-Yield NEET-PG Pearls: * **The "Hyoglossus Rule":** * **Lateral to Hyoglossus (Paralingual Space):** Lingual nerve, Hypoglossal nerve, Submandibular duct, and Sublingual gland. * **Medial to Hyoglossus:** Lingual artery and Glossopharyngeal nerve (CN IX). * **Clinical Correlation:** Ludwig’s Angina is a rapidly spreading cellulitis involving the submandibular, sublingual (paralingual), and submental spaces, often leading to airway obstruction. * **Nerve Relation:** The lingual nerve "double crosses" the submandibular duct—a classic "nerve under duct" relationship.

Question 13: The retropharyngeal space lies between which anatomical structures?

A. The base of the skull and the diaphragm
B. The base of the skull and the thoracic inlet
C. The base of the skull and the post-cricoid cartilage
D. The base of the skull and the bifurcation of the trachea (Correct Answer)

Explanation: ### Explanation The **retropharyngeal space** is a potential space of the neck located posterior to the pharynx. Understanding its boundaries is crucial for NEET-PG, as it serves as a major conduit for the spread of infection from the head to the mediastinum. **1. Why Option D is Correct:** The retropharyngeal space is bounded anteriorly by the **buccopharyngeal fascia** (covering the pharyngeal constrictor muscles) and posteriorly by the **prevertebral fascia** (specifically the alar layer). * **Superiorly:** It extends to the **base of the skull**. * **Inferiorly:** It extends to the level of the **bifurcation of the trachea (T4 level)**, where the alar fascia fuses with the buccopharyngeal fascia. **2. Analysis of Incorrect Options:** * **Option A:** The **prevertebral space** (located posterior to the prevertebral fascia) extends from the skull base down to the diaphragm, not the retropharyngeal space. * **Option B:** While the space passes through the thoracic inlet, it does not terminate there; it continues into the superior mediastinum. * **Option C:** The post-cricoid region is an anatomical landmark for the beginning of the esophagus (C6), but it does not mark the inferior limit of this fascial space. **3. Clinical Pearls & High-Yield Facts:** * **"Danger Space":** Located immediately posterior to the retropharyngeal space (between the alar and prevertebral fascia). It extends from the skull base all the way to the **diaphragm**, facilitating the spread of "descending necrotizing mediastinitis." * **Retropharyngeal Abscess:** Most common in children due to the presence of **Nodes of Rouviere** (retropharyngeal lymph nodes), which atrophy after age 6. * **Imaging:** On a lateral X-ray of the neck, the prevertebral soft tissue shadow at C2 should not exceed **7 mm** (roughly 1/3rd of the vertebral body width).

Question 14: Injury to the cervical sympathetic trunk produces Horner's syndrome. Which of the following is NOT a feature of Horner's syndrome?

A. Anhidrosis
B. Enophthalmos
C. Ptosis
D. Mydriasis (Correct Answer)

Explanation: Horner’s syndrome results from a lesion along the **sympathetic pathway** supplying the eye and face [2]. To answer this question, one must understand that the sympathetic nervous system is responsible for "fight or flight" responses, including pupillary dilation. **Why Mydriasis is the Correct Answer:** Mydriasis refers to pupillary dilation, which is a sympathetic function mediated by the *dilator pupillae* muscle [3]. In Horner’s syndrome, sympathetic supply is lost, leading to the unopposed action of the parasympathetic system (constrictor pupillae). This results in **Miosis** (constricted pupil), not mydriasis [1]. Therefore, mydriasis is the incorrect feature. **Analysis of Other Options:** * **Anhidrosis:** Sympathetic fibers stimulate sweat glands. Their loss leads to a lack of sweating on the affected side of the face. * **Enophthalmos:** This is the appearance of a "sunken eyeball." While often an illusion caused by the narrowing of the palpebral fissure, it can be due to paralysis of the orbitalis muscle (Muller’s muscle). * **Ptosis:** Specifically "partial ptosis." Sympathetic fibers supply the superior tarsal muscle (Muller’s muscle), which helps maintain an open eyelid. Its paralysis causes a slight drooping. **NEET-PG High-Yield Pearls:** 1. **The Classic Triad:** Ptosis, Miosis, and Anhidrosis. 2. **Pancoast Tumor:** A common cause of Horner’s syndrome due to involvement of the stellate ganglion at the lung apex. 3. **Cocaine Test:** In a Horner's pupil, cocaine drops will **not** dilate the eye (as there is no norepinephrine in the cleft to be reabsorbed) [1]. 4. **Apparent Enophthalmos:** It is usually "pseudo-enophthalmos" because the narrowing of the palpebral fissure makes the eye look deeper than it is.

Question 15: The cricothyroid joint is classified as which type of joint?

A. Hinge joint
B. Synchondrosis
C. Atavistic joint
D. Synovial joint (Correct Answer)

Explanation: **Explanation:** The **cricothyroid joint** is a bilateral articulation between the inferior horn of the thyroid cartilage and the posterolateral aspect of the cricoid cartilage. It is anatomically classified as a **plane synovial joint**. 1. **Why the correct answer is right:** The joint is enclosed by a fibrous capsule and lined by a synovial membrane. It allows for two types of movement: **rotation** (around a transverse axis) and **gliding**. These movements are essential for changing the tension of the vocal folds; when the thyroid cartilage tilts forward or the cricoid tilts backward, the distance between the vocal process and the thyroid angle increases, thereby lengthening and tensing the vocal cords. 2. **Why the incorrect options are wrong:** * **Hinge joint:** While the joint primarily rotates, it also allows gliding, which is not characteristic of a pure hinge joint (like the humeroulnar joint). * **Synchondrosis:** This is a primary cartilaginous joint where bones are joined by hyaline cartilage (e.g., the first rib and sternum). The cricothyroid joint has a joint cavity and synovial fluid, excluding this category. * **Atavistic joint:** This refers to a joint that represents a phylogenetic remnant of a bone that was once independent. The cricothyroid joint is a functional, permanent articulation in humans. **High-Yield Clinical Pearls for NEET-PG:** * **Nerve Supply:** The cricothyroid muscle (the only external muscle of the larynx) is supplied by the **external laryngeal nerve**. * **Action:** Contraction of the cricothyroid muscle acts on this joint to **tense the vocal cords**, raising the pitch of the voice. * **Cricoarytenoid Joint:** Like the cricothyroid, the cricoarytenoid joint is also a **synovial joint** (allowing rotation and gliding of the arytenoids).

Question 16: Which laryngeal cartilage forms a complete circle?

A. Thyroid
B. Cricoid (Correct Answer)
C. Corniculate
D. Arytenoid

Explanation: **Explanation:** The **Cricoid cartilage** is the only laryngeal cartilage that forms a **complete anatomical circle** (ring) around the airway. It is shaped like a "signet ring," featuring a narrow anterior arch and a broad posterior lamina. Located at the level of the **C6 vertebra**, it serves as the foundation of the larynx, providing structural support to keep the airway open. **Analysis of Options:** * **Thyroid Cartilage (Option A):** This is the largest cartilage of the larynx but is **incomplete posteriorly**. It consists of two laminae that meet anteriorly to form the laryngeal prominence (Adam’s apple), creating a V-shape rather than a circle. * **Corniculate Cartilage (Option C):** These are two small, conical nodules located at the apices of the arytenoid cartilages. They are accessory cartilages and do not form a ring. * **Arytenoid Cartilage (Option D):** These are paired, pyramid-shaped cartilages that sit atop the cricoid lamina. While crucial for vocal cord movement, they are discrete structures and do not encircle the airway. **High-Yield Clinical Pearls for NEET-PG:** * **Level:** The cricoid cartilage marks the level of **C6**, which is a critical landmark for the junction of the larynx with the trachea and the pharynx with the esophagus. * **Sellick’s Maneuver:** This involves applying downward pressure on the cricoid cartilage to occlude the esophagus against the C6 vertebral body, preventing gastric regurgitation during endotracheal intubation. * **Narrowest Part:** In pediatric patients (under 8-10 years), the subglottic region at the level of the cricoid ring is the narrowest part of the airway.

Question 17: The Node of Rouviere is located in which space?

A. Retropharyngeal space (Correct Answer)
B. Pharyngeal space
C. Nasopharyngeal space
D. Retromolar trigone

Explanation: Explanation: The **Node of Rouviere** is the most superior lymph node in the **retropharyngeal space**. It is located at the base of the skull, medial to the internal carotid artery, and is considered the lateral group of retropharyngeal nodes. 1. **Why Retropharyngeal Space is Correct:** The retropharyngeal space lies between the buccopharyngeal fascia (anteriorly) and the prevertebral fascia (posteriorly). The Node of Rouviere specifically drains the nasopharynx, soft palate, and middle ear. It is clinically significant because it is often the first site of metastasis for **nasopharyngeal carcinoma**. 2. **Why Other Options are Incorrect:** * **Pharyngeal space:** This is a broad anatomical term; the specific clinical entity for these nodes is the retropharyngeal space. * **Nasopharyngeal space:** While the node drains the nasopharynx, it is anatomically situated *behind* the pharynx in the potential space, not within the nasopharyngeal cavity itself. * **Retromolar trigone:** This is a mucosal area located behind the last mandibular molar; it is a site for oral cancers but does not house the Node of Rouviere. **High-Yield Clinical Pearls for NEET-PG:** * **"The Sentinel Node of Nasopharyngeal Carcinoma":** The Node of Rouviere is the primary nodal station for nasopharyngeal malignancies. * **Suppuration:** In children, infection in this node can lead to a **retropharyngeal abscess**, which presents as a medical emergency with airway compromise and a "hot potato voice." * **Involuted Nodes:** These nodes typically atrophy and disappear after the age of 4–5 years, which is why retropharyngeal abscesses are more common in young children than in adults.

Question 18: The base of the submental triangle is formed by which structure?

A. Chin
B. Omohyoid muscle
C. Hyoid bone (Correct Answer)
D. Digastric muscle

Explanation: The **submental triangle** is a high-yield anatomical area in the anterior neck. It is the only unpaired triangle in the neck, located centrally beneath the chin. ### **Anatomy of the Submental Triangle** * **Apex:** The symphysis menti (chin). * **Base (Inferior):** The **body of the hyoid bone**. * **Lateral Boundaries:** The anterior belly of the digastric muscle (on both sides). * **Floor:** The mylohyoid muscles (which meet at a midline raphe). * **Contents:** Submental lymph nodes and small submental veins that join to form the anterior jugular vein. ### **Why the Correct Answer is Right** The **hyoid bone** (Option C) serves as the horizontal foundation for this triangle. Anatomically, the triangle is inverted; its narrowest point (apex) is at the mandible, and its widest part (base) is formed by the superior border of the hyoid bone. ### **Why Other Options are Wrong** * **A. Chin:** This represents the **apex** of the triangle, where the two anterior bellies of the digastric muscles meet. * **B. Omohyoid muscle:** This muscle forms the boundaries of the **carotid and muscular triangles**, not the submental triangle. * **D. Digastric muscle:** While the **anterior belly** of the digastric forms the lateral borders, the muscle itself is not the base. ### **NEET-PG High-Yield Pearls** 1. **Unpaired Status:** Remember that the submental triangle is the **only unpaired** triangle in the neck; all others (carotid, muscular, submandibular) are paired. 2. **Lymphatic Drainage:** The submental lymph nodes primarily drain the tip of the tongue, the floor of the mouth, and the central part of the lower lip. 3. **Floor Composition:** The **mylohyoid muscle** is often called the "diaphragm of the mouth" and forms the floor of this triangle.

Question 19: Which is the only medial branch of the external carotid artery?

A. Superior thyroid
B. Lingual
C. Internal maxillary
D. Ascending pharyngeal (Correct Answer)

Explanation: The **External Carotid Artery (ECA)** is a major artery of the neck that provides the primary blood supply to the exterior of the cranium and the face. It typically gives off **eight branches**, which are categorized based on their direction of origin. ### **Why Ascending Pharyngeal is Correct** The **Ascending pharyngeal artery** is the smallest branch of the ECA. It arises from the posterior aspect of the artery near the bifurcation of the common carotid and runs vertically upward between the internal carotid artery and the pharynx. It is the **only branch** that arises from the **medial side** of the external carotid artery. ### **Analysis of Incorrect Options** * **A. Superior thyroid:** This is the first branch of the ECA, but it arises from the **anterior** aspect and descends to the thyroid gland. * **B. Lingual:** This is the second anterior branch, arising at the level of the greater cornu of the hyoid bone. It is an **anterior** branch. * **C. Internal maxillary:** Along with the superficial temporal artery, this is one of the two **terminal** branches of the ECA, arising within the parotid gland. ### **High-Yield Facts for NEET-PG** To remember the branches of the ECA, use the mnemonic: **"S**ome **A**natomists **L**ike **F**reaking **O**ut **P**oor **M**edical **S**tudents." 1. **Superior thyroid** (Anterior) 2. **Ascending pharyngeal** (**Medial**) 3. **Lingual** (Anterior) 4. **Facial** (Anterior) 5. **Occipital** (Posterior) 6. **Posterior auricular** (Posterior) 7. **Maxillary** (Terminal) 8. **Superficial temporal** (Terminal) **Clinical Pearl:** The ascending pharyngeal artery is clinically significant in embolization procedures for juvenile nasopharyngeal angiofibromas and glomus tumors, as it often provides the primary blood supply to these vascular lesions.

Question 20: A 45-year-old woman presents with a history of dysphagia, nighttime coughing fits, recurrent chest infections, and a palpable neck swelling. Radiographic examination reveals a congenital pharyngeal pouch. Between which muscles is this pouch typically located?

A. Between the styloglossus and stylopharyngeus muscles
B. Between the palatoglossal arch and the median glossoepiglottic fold
C. Between the superior and middle pharyngeal constrictors
D. Between the cricopharyngeal and thyropharyngeal portions of the inferior pharyngeal constrictor (Correct Answer)

Explanation: ### Explanation The clinical presentation of dysphagia, regurgitation, nighttime coughing (due to aspiration), and a palpable neck swelling points to a **Zenker’s Diverticulum** (pharyngeal pouch). **Why Option D is Correct:** Zenker’s diverticulum is a pulsion diverticulum occurring through a point of weakness in the posterior wall of the lower pharynx known as **Killian’s Dehiscence**. This triangular area is located between the two parts of the **inferior pharyngeal constrictor**: 1. **Thyropharyngeus:** The upper, oblique fibers [1]. 2. **Cricopharyngeus:** The lower, horizontal fibers (acting as the upper esophageal sphincter) [1]. Increased intraluminal pressure during swallowing, often due to incoordination of the cricopharyngeus, causes the mucosa to herniate through this weak spot. **Why Other Options are Incorrect:** * **Option A:** The styloglossus and stylopharyngeus are extrinsic muscles of the tongue and pharynx; their junction is not a site for diverticula. * **Option B:** This describes the region of the **vallecula**, located between the tongue base and epiglottis, not a site for pharyngeal herniation. * **Option C:** The gap between the superior and middle constrictors transmits the stylopharyngeus muscle and glossopharyngeal nerve, but it is not the site of Zenker’s diverticulum. **High-Yield Clinical Pearls for NEET-PG:** * **Killian’s Dehiscence:** The anatomical "weak spot" for Zenker’s. * **Halitosis:** A common symptom due to food stagnation and fermentation within the pouch. * **Boyce’s Sign:** A gurgling sound heard on pressing the neck swelling. * **Diagnosis:** Barium swallow is the investigation of choice (shows a "flask-shaped" pouch). Endoscopy is avoided due to the risk of perforation [1].

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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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