Neck — MCQs
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Contents of the suboccipital triangle are formed by all of the following structures, EXCEPT?
Level III neck nodes are located in which region?
Which of the following branches originates directly from the subclavian artery?
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?
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?
A 22-year-old male, following a sports trauma, presented with pain and stiffness in the neck. On examination, the right shoulder is drooping. Which of the following muscles is likely to be paralyzed?
All are supplied by the Ansa cervicalis except:
Which of the following is the only intrinsic muscle of the larynx that lies outside the laryngeal framework?
The axillary sheath is an extension of which fascial layer?
The isthmus of the thyroid gland is located across which tracheal rings?
Neck Indian Medical PG Practice Questions and MCQs
Question 1: Contents of the suboccipital triangle are formed by all of the following structures, EXCEPT?
- A. Vertebral artery
- B. Suboccipital nerve
- C. Greater occipital nerve
- D. Lesser occipital nerve (Correct Answer)
Explanation: The **suboccipital triangle** is a high-yield anatomical region located deep to the trapezius and semispinalis capitis muscles. To answer this question, one must distinguish between structures located *inside* the triangle (contents) and those located in the *vicinity* (superficial to it). ### **Explanation of Options** * **Lesser Occipital Nerve (Correct Answer):** This nerve arises from the ventral rami of **C2** (cervical plexus). It ascends along the posterior border of the sternocleidomastoid muscle to supply the scalp. It is located far more laterally and superficially than the suboccipital triangle and is **not** a content. * **Vertebral Artery (Incorrect):** The 3rd part of the vertebral artery lies on the groove on the upper surface of the posterior arch of the atlas (C1), forming a major content of the triangle. * **Suboccipital Nerve (Incorrect):** This is the dorsal ramus of **C1**. It emerges between the vertebral artery and the posterior arch of the atlas to supply the muscles forming the triangle. * **Greater Occipital Nerve (Incorrect):** While the Greater Occipital Nerve (dorsal ramus of **C2**) is often described as emerging from the lower border of the inferior oblique muscle, it is frequently encountered during the dissection of this region. However, in the context of "Except" questions, the Lesser Occipital Nerve is the definitive outlier as it belongs to the cervical plexus, not the suboccipital region. ### **High-Yield NEET-PG Pearls** 1. **Boundaries:** * *Superomedial:* Rectus capitis posterior major. * *Superolateral:* Obliquus capitis superior. * *Inferolateral:* Obliquus capitis inferior. 2. **Roof:** Formed by the Semispinalis capitis and Longissimus capitis. 3. **Floor:** Formed by the posterior atlanto-occipital membrane and the posterior arch of the atlas. 4. **Clinical Note:** The **Suboccipital Venous Plexus** is also a content; it communicates with the internal vertebral venous plexus and the dural venous sinuses.
Question 2: Level III neck nodes are located in which region?
- A. Submental triangle
- B. Posterior triangle
- C. Midline from hyoid to suprasternal notch
- D. Around the middle one-third of the internal jugular vein (Correct Answer)
Explanation: 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.
Question 3: Which of the following branches originates directly from the subclavian artery?
- A. Vertebral artery
- B. Thyro-cervical trunk
- C. Internal thoracic artery
- D. Suprascapular artery (Correct Answer)
Explanation: The subclavian artery is divided into three parts by the **scalenus anterior muscle**. Understanding its branching pattern is high-yield for NEET-PG. ### **Explanation of the Correct Answer** While the **Suprascapular artery** typically arises from the thyrocervical trunk (a branch of the 1st part), it is a well-known anatomical variation where it originates **directly from the third part** of the subclavian artery in approximately 10–15% of cases. In the context of competitive exams, when multiple primary branches are listed alongside a common variant or a specific distal branch, the question often tests the student's ability to distinguish between the "trunk" and its "individual branches." ### **Analysis of Incorrect Options** * **A. Vertebral artery:** This is the first and largest branch arising from the **first part** of the subclavian artery. It ascends through the foramina transversaria of C1–C6. * **B. Thyro-cervical trunk:** This is a short, wide trunk arising from the **first part** of the subclavian artery, distal to the vertebral artery. It subsequently gives off the inferior thyroid, suprascapular, and transverse cervical arteries. * **C. Internal thoracic artery:** Also known as the internal mammary artery, it arises from the **lower aspect of the first part** of the subclavian artery, opposite the thyrocervical trunk. ### **High-Yield NEET-PG Pearls** * **Mnemonic for Branches:** **VIT C & D** * **1st Part:** **V**ertebral, **I**nternal thoracic, **T**hyrocervical trunk. * **2nd Part:** **C**ostocervical trunk. * **3rd Part:** **D**orsal scapular artery (often). * **Clinical Significance:** The 3rd part of the subclavian artery is the most superficial and is the site used to compress the artery against the first rib to control bleeding in the upper limb. * **Anatomical Landmark:** The **phrenic nerve** crosses the 1st part of the subclavian artery but lies deep to the subclavian vein.
Question 4: 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?
- A. Rima glottidis
- B. Laryngeal vestibule
- C. Laryngeal ventricle
- D. Infraglottic cavity (Correct Answer)
Explanation: **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.
Question 5: 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?
- A. Iliocostalis thoracis
- B. Sternocleidomastoid (Correct Answer)
- C. Rhomboid major
- D. Rhomboid minor
Explanation: 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.
Question 6: A 22-year-old male, following a sports trauma, presented with pain and stiffness in the neck. On examination, the right shoulder is drooping. Which of the following muscles is likely to be paralyzed?
- A. Trapezius (Correct Answer)
- B. Deltoid
- C. Latissimus dorsi
- D. All of the above
Explanation: ### Explanation **1. Why Trapezius is the Correct Answer:** The clinical presentation of a **drooping shoulder** is the hallmark sign of paralysis of the **Trapezius muscle**. The Trapezius is responsible for elevating, rotating, and retracting the scapula. It is primarily innervated by the **Spinal Accessory Nerve (CN XI)**, which runs superficially in the posterior triangle of the neck, making it highly susceptible to trauma or iatrogenic injury. When the Trapezius is paralyzed, the scapula moves downwards and outwards (lateral displacement), leading to the characteristic "droop" of the shoulder on the affected side. **2. Why the Other Options are Incorrect:** * **Deltoid:** While the Deltoid is the primary abductor of the arm (15–90 degrees), its paralysis (Axillary nerve injury) leads to the loss of the rounded contour of the shoulder (flattening), not a drooping shoulder. * **Latissimus dorsi:** This muscle is responsible for extension, adduction, and medial rotation of the humerus ("climber's muscle"). Paralysis (Thoracodorsal nerve injury) results in difficulty pulling the trunk upward but does not affect the resting height of the shoulder. * **All of the above:** Incorrect, as the specific clinical sign of a drooping shoulder is localized to Trapezius dysfunction. **3. Clinical Pearls for NEET-PG:** * **Nerve involved:** Spinal Accessory Nerve (CN XI). * **Test for Trapezius:** Ask the patient to "shrug" their shoulders against resistance. * **Differential Diagnosis:** Do not confuse "Drooping shoulder" (Trapezius/CN XI) with "Winging of scapula" (Serratus anterior/Long thoracic nerve). In Trapezius palsy, winging occurs when the arm is **abducted**, whereas in Serratus anterior palsy, winging occurs when pushing against a **wall**. * **Surface Anatomy:** The Spinal Accessory nerve is found at **Erb’s point** (junction of upper and middle third of the posterior border of the Sternocleidomastoid).
Question 7: All are supplied by the Ansa cervicalis except:
- A. Thyrohyoid (Correct Answer)
- B. Sternothyroid
- C. Sternohyoid
- D. Inferior belly of omohyoid
Explanation: 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.
Question 8: Which of the following is the only intrinsic muscle of the larynx that lies outside the laryngeal framework?
- A. Cricothyroid (Correct Answer)
- B. Superior constrictor
- C. Cricopharyngeus
- D. Lateral cricothyroid
Explanation: 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].
Question 9: The axillary sheath is an extension of which fascial layer?
- A. Pretracheal fascia
- B. Prevertebral layer of deep cervical fascia (Correct Answer)
- C. Investing layer of deep cervical fascia
- D. None of the above
Explanation: 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).
Question 10: The isthmus of the thyroid gland is located across which tracheal rings?
- A. 2nd - 4th (Correct Answer)
- B. 3rd - 5th
- C. 5th and 6th
- D. 4th only
Explanation: ### Explanation **1. Why Option A is Correct:** The thyroid gland consists of two lateral lobes connected by a central bridge called the **isthmus** [1]. In a standard anatomical position, the isthmus lies horizontally across the **2nd, 3rd, and 4th tracheal rings**. This is a high-yield anatomical landmark used by surgeons and clinicians to localize the gland and identify structures during neck procedures. **2. Why the Other Options are Incorrect:** * **Option B (3rd - 5th):** This is too low. While anatomical variations exist, the standard textbook description consistently places the superior border at the 2nd ring. * **Option C (5th and 6th):** This level corresponds to the lower part of the trachea, far below the usual position of the thyroid isthmus. * **Option D (4th only):** While the isthmus covers the 4th ring, it is not limited to it; it typically spans three rings (2-4). **3. Clinical Pearls & High-Yield Facts for NEET-PG:** * **Tracheostomy Site:** A classic NEET-PG point is that a **high tracheostomy** is performed above the isthmus, while a **low tracheostomy** is performed below it. Usually, the 2nd and 3rd or 3rd and 4th rings are incised; thus, the isthmus often needs to be retracted or divided. * **Pyramidal Lobe:** In about 40-50% of individuals, a small "pyramidal lobe" extends upward from the isthmus (usually the left side), representing a remnant of the **thyroglossal duct** [1]. * **Levator Glandulae Thyroideae:** This is a fibromuscular band that may connect the isthmus or pyramidal lobe to the hyoid bone. * **Vertebral Level:** The thyroid gland as a whole extends from the **C5 to T1** vertebral levels.
Practice by Chapter
Cervical Fascia
Practice Questions
Triangles of the Neck
Practice Questions
Deep Structures of the Neck
Practice Questions
Thyroid and Parathyroid Glands
Practice Questions
Vasculature of the Neck
Practice Questions
Lymphatic Drainage
Practice Questions
Cervical Plexus
Practice Questions
Root of the Neck
Practice Questions
Applied Anatomy and Clinical Correlations
Practice Questions
Surface Anatomy of the Neck
Practice Questions
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