Neck — MCQs

Neck Indian Medical PG Practice Questions and MCQs

Question 251: Which cervical vertebra does not have a body or spinous process?

A. C1 (Correct Answer)
B. C2
C. C3
D. C4

Explanation: ### Explanation The correct answer is **C1 (Atlas)**. **Why C1 is the correct answer:** The first cervical vertebra, known as the **Atlas**, is unique because it lacks both a **body** and a **spinous process**. Structurally, it consists of two lateral masses connected by a short **anterior arch** and a longer **posterior arch**, forming a ring-like shape. * **Lack of Body:** During embryological development, the centrum (body) of C1 fuses with the body of C2 (Axis) to form the **Odontoid process (Dens)**. * **Lack of Spinous Process:** Instead of a spine, C1 has a small **posterior tubercle**, which prevents interference with the nodding movement (atlanto-occipital joint). **Why the other options are incorrect:** * **C2 (Axis):** Characterized by the presence of the **Dens** (its body) and a very strong, **bifid spinous process**, which is the first palpable spine below the occiput. * **C3 & C4:** These are "typical" cervical vertebrae. They possess a small, broad body and a short, bifid spinous process. **High-Yield Clinical Pearls for NEET-PG:** * **Jefferson Fracture:** A burst fracture of the C1 ring caused by axial loading (e.g., diving into a shallow pool). * **Vertebral Artery:** Travels through the *foramen transversarium* of C1 to C6. On C1, it lies in a groove on the superior aspect of the posterior arch. * **Atypical Cervical Vertebrae:** C1 (no body/spine), C2 (has dens), and C7 (Vertebra Prominens—long non-bifid spine and small/absent foramen transversarium). * **Atlanto-axial joint:** Responsible for the "No" (rotational) movement of the head.

Question 252: What is the narrowest part of the larynx?

A. Ventricle
B. Vestibule
C. Subglottic space
D. Glottis (Correct Answer)

Explanation: ### Explanation The larynx is a complex cartilaginous structure divided into three main regions: the supraglottis, the glottis, and the subglottis. **Why Glottis is the correct answer:** The **glottis** (specifically the Rima Glottidis) is the narrowest part of the larynx in **adults**. It is the triangular space located between the two true vocal folds. Anatomically, this area represents the point of maximum constriction within the laryngeal airway. In clinical practice, this is the most critical landmark during endotracheal intubation. **Analysis of Incorrect Options:** * **Ventricle (Laryngeal Sinus):** This is a fusiform recess located between the vestibular folds (false cords) and the vocal folds (true cords). It is a lateral expansion, not a point of narrowing. * **Vestibule:** This is the wide, funnel-shaped upper part of the laryngeal cavity above the vestibular folds. It is the widest part of the internal larynx. * **Subglottic Space:** This is the region below the vocal folds extending to the lower border of the cricoid cartilage. While it is the narrowest part of the **entire upper airway in infants** (due to the non-expandable cricoid ring), it is wider than the glottis in adults. **High-Yield Clinical Pearls for NEET-PG:** * **Age-Specific Anatomy:** In **adults**, the narrowest part is the **Glottis**. In **infants/children** (under 8-10 years), the narrowest part is the **Cricoid Cartilage** (Subglottis). * **Rima Glottidis:** It consists of an anterior intermembranous part (3/5th) and a posterior intercartilaginous part (2/5th). * **Safety Landmark:** The narrowest point determines the maximum size of the endotracheal tube that can be passed safely without causing mucosal trauma or subsequent subglottic stenosis.

Question 253: The fascial spaces involved in Ludwig's angina are?

A. Unilateral submandibular and sublingual spaces
B. Bilateral submandibular and sublingual spaces
C. Unilateral submandibular, sublingual, and submental spaces
D. Bilateral submandibular, sublingual, and submental spaces (Correct Answer)

Explanation: ### Explanation **Concept Overview** Ludwig’s angina is a rapidly spreading, potentially life-threatening **cellulitis** of the floor of the mouth. The defining anatomical characteristic of Ludwig’s angina is its **bilateral** involvement of the submandibular, sublingual, and submental spaces. These spaces communicate freely with one another, allowing infection (usually odontogenic, originating from the 2nd or 3rd mandibular molars) to spread rapidly without involving the lymph nodes. **Why Option D is Correct** By definition, Ludwig’s angina is a **multispace** infection. The submandibular space is divided by the mylohyoid muscle into the sublingual space (above) and the submaxillary space (below). For a diagnosis of Ludwig’s angina, the infection must involve all three compartments—**submandibular, sublingual, and submental**—on **both sides (bilateral)**. **Analysis of Incorrect Options** * **Options A & C:** These are incorrect because Ludwig’s angina is never unilateral. If the infection is confined to one side, it is simply a localized space infection, not Ludwig’s angina. * **Option B:** While it mentions bilateral involvement, it omits the **submental space**. The submental space is anatomically continuous with the submandibular spaces and is consistently involved in the clinical presentation of the "woody" or "brawny" edema characteristic of this condition. **High-Yield Clinical Pearls for NEET-PG** * **Source of Infection:** Most commonly the **lower 2nd and 3rd molars** (roots lie below the mylohyoid line). * **Clinical Sign:** "Woody" or "Brawny" edema of the neck; the tongue is often displaced **upward and backward**, leading to potential airway obstruction. * **Primary Risk:** Asphyxia (Airway obstruction) is the most common cause of death. * **Management:** Airway maintenance is the priority, followed by IV antibiotics and surgical drainage if necessary. * **Anatomy Note:** It is a cellulitis, **not an abscess**, meaning pus collection is rare in the early stages.

Question 254: Pulsations felt in the suprasternal space are probably due to:

A. Subclavian artery
B. Common carotid artery
C. Inferior thyroid artery (Correct Answer)
D. Vertebral artery

Explanation: **Explanation:** The **suprasternal space (Space of Burns)** is a small anatomical compartment located between the superficial and pretracheal layers of the deep cervical fascia, just above the manubrium sterni. **Why Inferior Thyroid Artery is correct:** The **inferior thyroid artery**, a branch of the thyrocervical trunk, ascends behind the carotid sheath and then arches medially to reach the posterior aspect of the thyroid gland [1]. In its course, it passes behind the pretracheal fascia. If the artery follows a low or tortuous course, its pulsations can be transmitted to the suprasternal space. Additionally, the **thyroidea ima artery** (an occasional branch from the brachiocephalic trunk or aortic arch) may also be present in this midline region, contributing to palpable pulsations. **Why the other options are incorrect:** * **Subclavian Artery:** This artery is located laterally in the supraclavicular fossa, passing behind the scalenus anterior muscle. It is too lateral to cause pulsations in the midline suprasternal space. * **Common Carotid Artery:** These arteries ascend within the carotid sheath, lateral to the trachea and esophagus. Their pulsations are felt along the anterior border of the sternocleidomastoid, not in the suprasternal notch. * **Vertebral Artery:** This artery is deeply situated, entering the foramen transversarium of the C6 vertebra. It is far removed from the superficial suprasternal space. **NEET-PG High-Yield Pearls:** * **Contents of Suprasternal Space:** Sternal heads of SCM, Jugular venous arch, Interclavicular ligament, and occasionally the Inferior thyroid artery/Thyroidea ima. * **Clinical Significance:** A "tracheal tug" or abnormal pulsations in this area may also suggest an **Aortic Arch Aneurysm**. * **Thyroidea Ima Artery:** Present in approximately 3–10% of the population; it is a critical consideration during emergency tracheostomies to avoid fatal hemorrhage.

Question 255: The danger area of the neck is situated between which fascias?

A. Buccopharyngeal and prevertebral fascia
B. Pharyngobasilar and prevertebral fascia
C. Prevertebral and alar fascia (Correct Answer)
D. Buccopharyngeal and alar fascia

Explanation: ### Explanation The **Danger Space** of the neck is a potential space located posterior to the pharynx. It is clinically significant because it contains loose areolar tissue and extends from the **base of the skull** down to the **posterior mediastinum** (level of the diaphragm). **1. Why Option C is Correct:** The deep cervical fascia splits into various layers. The **prevertebral fascia** (the deepest layer) splits into two laminae: the **alar fascia** (anteriorly) and the **prevertebral fascia proper** (posteriorly). The space between these two layers is the **Danger Space**. It is called "danger" because infections (like a retropharyngeal abscess) can track through this space directly into the thorax, leading to life-threatening mediastinitis. **2. Why the Other Options are Incorrect:** * **Option A & D:** The space between the **buccopharyngeal fascia** (covering the pharyngeal constrictors) and the **alar fascia** is the **Retropharyngeal Space**. This space ends at the level of T2/T4 (superior mediastinum), unlike the danger space which extends further down. * **Option B:** The **pharyngobasilar fascia** is a fibrous membrane that suspends the pharynx from the skull base; it does not form the boundaries of the danger space. **3. High-Yield Clinical Pearls for NEET-PG:** * **Retropharyngeal Space:** Located between the buccopharyngeal and alar fascia. * **Danger Space:** Located between the alar and prevertebral fascia. * **Clinical Extension:** If a patient presents with a neck infection that rapidly progresses to the chest, the "Danger Space" is the anatomical route. * **Prevertebral Space:** Located between the prevertebral fascia and the vertebral bodies; infections here (e.g., Pott’s disease/TB spine) typically present as a midline swelling.

Question 256: All of the following are contents of the occipital triangle except?

A. Great auricular nerve
B. Suprascapular nerve (Correct Answer)
C. Lesser occipital nerve
D. Occipital artery

Explanation: The **Occipital Triangle** is the larger, superior division of the posterior triangle of the neck, separated from the smaller supraclavicular (subclavian) triangle by the inferior belly of the omohyoid muscle. ### Why Suprascapular Nerve is the Correct Answer The **Suprascapular nerve** (derived from the upper trunk of the brachial plexus) is a content of the **Supraclavicular (Subclavian) triangle**, not the occipital triangle. It passes deep to the inferior belly of the omohyoid to reach the suprascapular notch. ### Analysis of Other Options * **Great Auricular Nerve (C2, C3):** This is a branch of the cervical plexus that emerges at the "nerve point of the neck" (Erb’s point) along the posterior border of the sternocleidomastoid, which lies within the occipital triangle. * **Lesser Occipital Nerve (C2):** Similar to the great auricular nerve, it ascends along the posterior border of the sternocleidomastoid within the occipital triangle to supply the scalp. * **Occipital Artery:** It appears at the apex of the occipital triangle, passing upwards to the back of the head. ### High-Yield NEET-PG Pearls * **Floor of Occipital Triangle:** Formed by (from above downwards): Splenius capitis, Levator scapulae, and Scalenus medius & posterior. * **Most Important Content:** The **Spinal Accessory Nerve (CN XI)** is the most significant structure in this triangle; it is superficial and highly vulnerable to injury during lymph node biopsies. * **Mnemonic for Nerve Point (Erb's Point):** **"GATS"** – **G**reat auricular, **A**ntorior cutaneous, **T**ransverse cervical, and **S**upraclavicular nerves (though Supraclavicular nerves descend into the lower triangle). * **Boundary Distinction:** The **inferior belly of the omohyoid** is the key landmark dividing the posterior triangle into the Occipital (superior) and Supraclavicular (inferior) triangles.

Question 257: What are the contents of the posterior triangle of the neck?

A. Occipital artery, spinal accessory nerve, hypoglossal nerve, ascending pharyngeal artery
B. Occipital artery, lesser occipital nerve, subclavian artery, spinal accessory nerve (Correct Answer)
C. Occipital artery, spinal accessory nerve, subclavian artery, hypoglossal nerve
D. Occipital artery, lesser occipital nerve, ascending pharyngeal artery, vagus nerve

Explanation: The posterior triangle of the neck is bounded by the Sternocleidomastoid (anteriorly), Trapezius (posteriorly), and the middle third of the clavicle (inferiorly). It is subdivided by the inferior belly of the omohyoid into the **occipital triangle** and the **supraclavicular (subclavian) triangle**. ### Why Option B is Correct The contents of the posterior triangle include: * **Nerves:** Spinal accessory nerve (CN XI), branches of the cervical plexus (Lesser occipital, Great auricular, Transverse cervical, and Supraclavicular nerves), and the trunks of the Brachial plexus. * **Vessels:** Subclavian artery (3rd part), Occipital artery (at the apex), Suprascapular and Transverse cervical arteries. * **Lymph nodes:** Supraclavicular and Occipital nodes. ### Why Other Options are Incorrect * **Hypoglossal nerve (Options A & C):** This nerve is located in the **digastric (submandibular) and carotid triangles** of the anterior triangle. It does not enter the posterior triangle. * **Ascending pharyngeal artery (Options A & D):** This is a branch of the External Carotid Artery found within the **carotid triangle**. * **Vagus nerve (Option D):** The Vagus nerve travels within the **carotid sheath**, which is located deep to the Sternocleidomastoid in the anterior triangle. ### High-Yield Clinical Pearls for NEET-PG * **Spinal Accessory Nerve (CN XI):** It is the most superficial and vulnerable structure in the posterior triangle. Injury (e.g., during lymph node biopsy) leads to **drooping of the shoulder** due to paralysis of the Trapezius. * **Erb’s Point (Punctum Nervosum):** Located at the midpoint of the posterior border of the Sternocleidomastoid, where all four cutaneous branches of the cervical plexus emerge. * **Floor of the Triangle:** Formed by the Splenius capitis, Levator scapulae, and Scalenus medius/posterior muscles, all covered by the prevertebral fascia.

Question 258: What is true about a branchial cyst?

A. Present in the anterior triangle of the neck
B. Cauterization is performed
C. Arises from the 2nd branchial cleft (Correct Answer)
D. Present in the lower third of the neck

Explanation: ### Explanation **1. Why Option C is Correct:** Branchial cysts are congenital epithelial cysts that result from the failure of the **second branchial cleft** to involute during embryonic development [1]. Normally, the second arch grows downwards and covers the third and fourth arches, creating the **Sinus of His**, which should disappear. If a portion of this sinus persists, it forms a branchial cyst. Statistically, **95% of all branchial anomalies** arise from the second branchial cleft. **2. Why the Other Options are Incorrect:** * **Option A:** While the cyst is located in the neck, it is specifically found along the **upper third of the anterior border of the sternocleidomastoid muscle**. It is not generalized to the entire anterior triangle. * **Option B:** The definitive treatment is **complete surgical excision** [1]. Cauterization is ineffective and inappropriate because the cyst wall must be entirely removed to prevent recurrence. * **Option D:** These cysts are typically located at the junction of the **upper and middle thirds** of the sternocleidomastoid muscle [1]. Anomalies in the lower third are more commonly associated with the first branchial cleft (near the ear) or third/fourth clefts (rare). **3. Clinical Pearls for NEET-PG:** * **Location:** Always look for the "anterior border of the sternocleidomastoid" in the question stem. * **Fluid Characteristics:** Aspiration typically reveals a **straw-colored fluid** containing **cholesterol crystals**. * **Lining:** Most are lined by stratified squamous epithelium (due to ectodermal origin). * **Differential Diagnosis:** Unlike a thyroglossal cyst, a branchial cyst **does not move** with deglutition or protrusion of the tongue. * **Branchial Fistula:** If the sinus remains open both internally and externally, it follows a path between the internal and external carotid arteries.

Question 259: The anterior triangle occupies the side of the neck in front of the sternomastoid muscle. What structure forms its anterior boundary?

A. Anterior median line of the neck extending from symphysis menti to suprasternal notch (Correct Answer)
B. The midline of the neck
C. Midline of the neck up to the sternoclavicular joint
D. Posterior border of the thyroid gland

Explanation: ### Explanation The **Anterior Triangle** of the neck is a crucial anatomical region defined by specific boundaries. To understand the correct answer, one must visualize the neck as a quadrilateral area divided into two triangles by the **Sternocleidomastoid (SCM)** muscle. **1. Why Option A is Correct:** The boundaries of the anterior triangle are: * **Anteriorly:** The **anterior median line** of the neck, which specifically extends from the **symphysis menti** (chin) superiorly to the **suprasternal notch** (manubrium) inferiorly. * **Posteriorly:** The anterior border of the Sternocleidomastoid muscle. * **Superiorly (Base):** The lower border of the body of the mandible and a line extending from the angle of the mandible to the mastoid process. * **Apex:** Located at the suprasternal notch. **2. Analysis of Incorrect Options:** * **Option B & C:** While "midline" is colloquially used, NEET-PG requires precise anatomical landmarks. Option B is too vague. Option C is incorrect because the midline ends at the suprasternal notch, not the sternoclavicular joint (which is lateral to the notch). * **Option D:** The thyroid gland is a content of the muscular triangle (a subdivision of the anterior triangle); its posterior border does not form a boundary of the main triangle itself. **3. Clinical Pearls & High-Yield Facts:** * **Subdivisions:** The anterior triangle is further divided by the digastric and omohyoid muscles into four smaller triangles: **Submental, Submandibular (Digastric), Carotid, and Muscular.** * **Carotid Triangle:** This is the most clinically significant subdivision as it contains the carotid sheath (Common Carotid Artery, Internal Jugular Vein, and Vagus Nerve). * **Nerve Supply:** The skin over the anterior triangle is supplied by the **Transverse Cervical Nerve (C2, C3)**.

Question 260: Chassaignac's tubercle is located at the level of which anatomical landmark?

A. Erb's point (Correct Answer)
B. Stellate ganglion
C. Atlas
D. Odontoid process

Explanation: **Explanation:** **Chassaignac’s tubercle**, also known as the **carotid tubercle**, is the prominent anterior tubercle of the transverse process of the **sixth cervical vertebra (C6)**. It serves as a vital surgical and anesthetic landmark in the neck. 1. **Why Erb’s point is correct:** Erb’s point (nerve point of the neck) is located at the posterior border of the sternocleidomastoid muscle, approximately at the level of the **C6 vertebra**. Since Chassaignac’s tubercle is also located at the C6 level, they serve as corresponding landmarks for regional anesthesia. The tubercle is used to compress the common carotid artery to control bleeding or as a landmark for performing a cervical plexus block near Erb's point. 2. **Why the other options are incorrect:** * **Stellate ganglion:** This sympathetic ganglion is formed by the fusion of the inferior cervical and first thoracic ganglia. It is typically located at the level of **C7 and T1**, just above the neck of the first rib, which is inferior to Chassaignac’s tubercle. * **Atlas (C1):** The first cervical vertebra is located much higher in the neck, near the base of the skull. It lacks a vertebral body and a prominent anterior tubercle like C6. * **Odontoid process (Dens):** This is a feature of the **Axis (C2)** vertebra. It projects superiorly to articulate with C1 and is located superior to the C6 level. **High-Yield Clinical Pearls for NEET-PG:** * **Carotid Compression:** The common carotid artery can be compressed against Chassaignac’s tubercle to achieve temporary hemostasis. * **Stellate Ganglion Block:** Chassaignac’s tubercle is the primary landmark for this procedure; the needle is first directed toward the C6 tubercle before being redirected inferiorly toward C7/T1 to avoid piercing the vertebral artery or pleura. * **Level of C6:** Other structures at this level include the cricoid cartilage, the start of the trachea, and the start of the esophagus.

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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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Neck — MCQs

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