Neck — MCQs

Neck Indian Medical PG Practice Questions and MCQs

Question 81: Petit's ligament is located at which anatomical region?

A. Neck
B. Upper limb
C. Lower limb
D. Pelvis (Correct Answer)

Explanation: Explanation: **Petit’s ligament**, also known as the **uterosacral ligament**, is a crucial anatomical structure located within the **pelvis**. It is a condensation of pelvic fascia that extends from the cervix and lateral parts of the vaginal vault to the front of the sacrum (specifically the S2-S3 vertebrae) [1]. Its primary function is to provide posterior support to the uterus, maintaining it in an anteverted position and preventing uterine prolapse [1]. Analysis of Options: * **A. Neck:** While the neck contains various ligaments (e.g., ligamentum nuchae), Petit’s ligament is strictly a pelvic structure. * **B. Upper limb & C. Lower limb:** These regions contain numerous ligaments associated with joints (e.g., glenohumeral or cruciate ligaments), but none are named after Petit. * **D. Pelvis (Correct):** As established, Petit’s ligament is synonymous with the uterosacral ligament, a key component of the pelvic floor support system [1]. High-Yield Clinical Pearls for NEET-PG: 1. **Uterosacral Ligament (Petit’s):** It forms the lateral boundaries of the **Pouch of Douglas** (rectouterine pouch). 2. **Clinical Significance:** During vaginal hysterectomy or apical suspension surgeries, Petit’s ligament is often used for fixation to treat pelvic organ prolapse [1]. 3. **Nerve Supply:** It contains components of the **inferior hypogastric plexus**; hence, stretching or involvement of this ligament in endometriosis often leads to chronic pelvic pain or dyspareunia. 4. **Distinction:** Do not confuse Petit's ligament with **Petit’s Triangle** (Inferior Lumbar Triangle), which is located in the posterior abdominal wall and is a site for lumbar hernias.

Question 82: Which structure(s) pass between the middle and inferior constrictor muscles of the pharynx?

A. Superior laryngeal artery and vein
B. Styloglossus muscle
C. Internal laryngeal branch of the superior laryngeal nerve
D. Superior laryngeal artery and vein, and the internal laryngeal branch of the superior laryngeal nerve (Correct Answer)

Explanation: The pharyngeal wall is composed of three overlapping constrictor muscles. Between these muscles, and between the superior constrictor and the skull base, are four distinct gaps (intervals) that allow the passage of vital neurovascular structures. ### **Why Option D is Correct** The gap between the **middle and inferior constrictor muscles** is occupied by the **thyrohyoid membrane**. This membrane is pierced by two structures that provide sensory innervation and blood supply to the larynx above the vocal folds: 1. **Internal laryngeal nerve** (a branch of the superior laryngeal nerve from the Vagus). 2. **Superior laryngeal artery** (a branch of the superior thyroid artery) and its accompanying vein. ### **Analysis of Incorrect Options** * **Option A & C:** These are partially correct but incomplete. In NEET-PG, the most comprehensive option is the preferred answer. * **Option B:** The **Styloglossus muscle**, along with the Stylopharyngeus and the Glossopharyngeal nerve (CN IX), passes through the gap between the **superior and middle constrictor muscles**. ### **High-Yield Facts for NEET-PG** To master the pharyngeal gaps, remember these four intervals: 1. **Above Superior Constrictor:** Auditory (Eustachian) tube, Levator veli palatini, and Ascending palatine artery. 2. **Between Superior & Middle:** Stylopharyngeus muscle and Glossopharyngeal nerve (CN IX). 3. **Between Middle & Inferior:** Internal laryngeal nerve and Superior laryngeal vessels. 4. **Below Inferior Constrictor:** Recurrent laryngeal nerve and Inferior laryngeal vessels (entering the larynx behind the cricothyroid joint). **Clinical Pearl:** The internal laryngeal nerve is responsible for the **afferent limb of the cough reflex**. Accidental injury during thyroid surgery (though less common than recurrent laryngeal nerve injury) can lead to a loss of sensation in the laryngeal vestibule, increasing the risk of aspiration.

Question 83: The common carotid artery is palpable at which anatomical landmark?

A. Upper border of the thyroid cartilage (Correct Answer)
B. Upper border of the cricoid cartilage
C. The hyoid bone
D. Lower border of the cricoid cartilage

Explanation: The **common carotid artery (CCA)** is a vital vascular structure in the neck. It ascends within the carotid sheath and typically bifurcates into the internal and external carotid arteries at the level of the **upper border of the thyroid cartilage**, which corresponds to the **C4 vertebral level**. ### Why Option A is Correct The carotid pulse is most easily palpable in the **carotid triangle**. At the level of the upper border of the thyroid cartilage, the artery is relatively superficial, positioned just medial to the anterior border of the sternocleidomastoid muscle. This landmark is the standard clinical point for checking the carotid pulse during CPR or physical examinations. ### Why Other Options are Incorrect * **B & D (Cricoid Cartilage):** The cricoid cartilage lies at the **C6 level**. While the CCA can be compressed against the transverse process of C6 (Chassaignac’s tubercle) to control bleeding, it is deeper here. The lower border of the cricoid (C6) marks the beginning of the trachea and esophagus, not the primary palpation site for the bifurcation. * **C (Hyoid Bone):** The hyoid bone lies at the **C3 level**, superior to the thyroid cartilage. While the carotid vessels pass near it, the bifurcation and the most prominent pulsation point are lower, at the thyroid cartilage. ### High-Yield Clinical Pearls for NEET-PG * **Vertebral Levels:** Bifurcation of CCA = **C4**; Cricoid cartilage/Start of Trachea = **C6**. * **Carotid Sinus:** Located at the bifurcation; it acts as a baroreceptor (innervated by the Glossopharyngeal nerve, CN IX). * **Carotid Body:** A chemoreceptor located posterior to the bifurcation, sensing changes in $O_2$, $CO_2$, and pH. * **Surface Anatomy:** The CCA is found along a line connecting the sternoclavicular joint to a point midway between the mastoid process and the angle of the mandible.

Question 84: During a thyroid operation, a nerve coursing along with the superior thyroid artery is injured. What is the possible consequence of this injury?

A. Loss of sensation above the vocal cord
B. Loss of sensation below the vocal cord
C. Paralysis of the lateral cricoarytenoid muscle
D. Paralysis of the cricothyroid muscle (Correct Answer)

Explanation: ### Explanation The correct answer is **D. Paralysis of the cricothyroid muscle.** **1. Why the correct answer is right:** The **superior thyroid artery** is closely related to the **external laryngeal nerve** (a branch of the superior laryngeal nerve). During thyroidectomy, when ligating the superior thyroid artery, this nerve is at high risk of injury if the artery is not ligated close to the gland. The external laryngeal nerve provides motor innervation to only one muscle: the **cricothyroid**. This muscle acts as a tensor of the vocal cords; its paralysis leads to a weak, husky voice and an inability to produce high-pitched sounds. **2. Why the incorrect options are wrong:** * **Option A:** Loss of sensation above the vocal cords is caused by injury to the **internal laryngeal nerve**. While this is also a branch of the superior laryngeal nerve, it travels with the superior laryngeal artery (piercing the thyrohyoid membrane), not the superior thyroid artery. * **Option B:** Loss of sensation below the vocal cords is mediated by the **recurrent laryngeal nerve** [1]. * **Option C:** The lateral cricoarytenoid (and all other intrinsic muscles of the larynx except the cricothyroid) is innervated by the **recurrent laryngeal nerve**, which is related to the *inferior* thyroid artery [1]. **3. Clinical Pearls for NEET-PG:** * **Superior Thyroid Artery:** Ligate **near** the gland to save the External Laryngeal Nerve. * **Inferior Thyroid Artery:** Ligate **away** from the gland to save the Recurrent Laryngeal Nerve [1]. * **The "Singer’s Nerve":** The external laryngeal nerve is often called the singer's nerve because its injury prevents the tension of vocal cords required for high pitch. * **Unilateral Recurrent Laryngeal Nerve injury:** Results in hoarseness of voice. * **Bilateral Recurrent Laryngeal Nerve injury:** Results in inspiratory stridor and dyspnea (emergency) [1].

Question 85: The narrowest part of the trachea in a newborn is at which level?

A. Cricoid cartilage (Correct Answer)
B. Thyroid cartilage
C. Vocal cords
D. Subglottic region

Explanation: **Explanation:** In the pediatric airway, specifically in newborns and infants, the narrowest part of the entire upper airway is the **cricoid cartilage**. This is due to the unique funnel-shaped (conical) anatomy of the young larynx, where the airway tapers down toward the subglottic region. The cricoid is the only complete cartilaginous ring in the respiratory tract, making it a non-distensible fixed point. **Analysis of Options:** * **A. Cricoid cartilage (Correct):** In children under 8–10 years, the airway is narrowest at the level of the cricoid ring. This is a critical anatomical difference from adults. * **B. Thyroid cartilage:** This forms the laryngeal prominence but does not represent a point of physiological or anatomical narrowing. * **C. Vocal cords:** In **adults**, the glottis (rima glottidis) at the level of the vocal cords is the narrowest part. In newborns, the glottis is wider than the cricoid lumen. * **D. Subglottic region:** While the cricoid is located in the subglottic region, the specific anatomical structure responsible for the narrowing is the cricoid ring itself. **Clinical Pearls for NEET-PG:** * **Endotracheal Intubation:** Because the cricoid is the narrowest point and non-expandable, **uncuffed endotracheal tubes** were traditionally preferred in neonates to prevent pressure necrosis and subsequent subglottic stenosis. * **Foreign Body Aspiration:** Objects that pass through the vocal cords in a child may still become impacted at the cricoid level. * **Shape Difference:** Remember the mnemonic: **Adult airway is Cylindrical; Pediatric airway is Funnel-shaped.**

Question 86: The stellate ganglion is located:

A. Posterior to prevertebral fascia
B. Posterior to trachea
C. Anterior to the transverse process of C6
D. Anterior to the transverse process of C7 (Correct Answer)

Explanation: The **stellate ganglion** (cervicothoracic ganglion) is formed by the fusion of the **inferior cervical ganglion** and the **first thoracic (T1) ganglion**. It is a key component of the sympathetic chain. **Why Option D is Correct:** Anatomically, the stellate ganglion lies in the **root of the neck**. It is situated anterior to the **transverse process of the C7 vertebra** and the neck of the first rib. It lies posterior to the vertebral artery and the carotid sheath. **Analysis of Incorrect Options:** * **Option A:** The sympathetic chain (including the stellate ganglion) lies **anterior** to the prevertebral fascia. This is a critical surgical landmark; the fascia separates the ganglion from the longus colli muscle. * **Option B:** The ganglion is located laterally in the paravertebral gutter, far lateral to the **trachea**, which is a midline structure. * **Option C:** The **middle cervical ganglion** is typically associated with the level of the C6 transverse process (Chassaignac’s tubercle). The stellate ganglion is located more inferiorly. **High-Yield Clinical Pearls for NEET-PG:** * **Horner’s Syndrome:** Injury to the stellate ganglion (e.g., due to a Pancoast tumor or iatrogenic injury during central line placement) results in miosis, ptosis, and anhidrosis. * **Stellate Ganglion Block:** Used to treat complex regional pain syndrome (CRPS) of the upper limb and Raynaud’s disease. The needle is typically directed toward the **C6 tubercle** (easier to palpate) to avoid pleural injury, and the local anesthetic tracks down to the ganglion. * **Relations:** It is separated from the apex of the lung by the **suprapleural membrane (Sibson’s fascia)**.

Question 87: What is the most common nerve injured during ligation of the superior thyroid artery?

A. Recurrent laryngeal nerve (RLN) (Correct Answer)
B. Facial nerve
C. Mandibular nerve
D. Auditory nerve

Explanation: The correct answer is **Recurrent laryngeal nerve (RLN)**. ### **Anatomical Basis** The relationship between the thyroid arteries and laryngeal nerves is a high-yield surgical anatomy concept. During thyroidectomy, the **Superior Thyroid Artery (STA)** is closely related to the **External Laryngeal Nerve (ELN)**, while the **Inferior Thyroid Artery (ITA)** is closely related to the **Recurrent Laryngeal Nerve (RLN)** [2]. While the ELN is at risk during STA ligation, the **Recurrent Laryngeal Nerve** is statistically the most frequently injured nerve during thyroid surgeries overall due to its variable course and proximity to the posterior aspect of the gland and the ITA [1]. In the context of this specific question (often a point of debate in exams), the RLN remains the most clinically significant nerve injury associated with thyroid vascular ligation [1]. ### **Analysis of Incorrect Options** * **Facial Nerve (CN VII):** Supplies muscles of facial expression. It is located much higher in the parotid region and is not at risk during thyroid surgery. * **Mandibular Nerve (V3):** A branch of the Trigeminal nerve providing sensory to the lower face and motor to muscles of mastication; it is located in the infratemporal fossa. * **Auditory Nerve (CN VIII):** Located within the internal acoustic meatus; it is involved in hearing and balance and has no relation to neck surgery. ### **NEET-PG High-Yield Pearls** * **The "Close-Far" Rule:** To avoid nerve injury, ligate the **Superior Thyroid Artery** as **close** to the gland as possible (to save the External Laryngeal Nerve) and ligate the **Inferior Thyroid Artery** as **far** from the gland as possible (to save the Recurrent Laryngeal Nerve) [2]. * **Injury Presentation:** * **Unilateral RLN injury:** Hoarseness of voice [1]. * **Bilateral RLN injury:** Aphonia and respiratory distress (emergency) [1]. * **External Laryngeal Nerve injury:** Loss of high-pitched voice (due to paralysis of the Cricothyroid muscle).

Question 88: Injury of which nerve causes vocal cord paralysis?

A. Recurrent laryngeal (Correct Answer)
B. External laryngeal
C. Internal laryngeal
D. Superior laryngeal

Explanation: **Explanation:** The **recurrent laryngeal nerve (RLN)** is the primary motor supply to the larynx. It innervates all the intrinsic muscles of the larynx **except** for the cricothyroid muscle. Since these muscles (specifically the posterior cricoarytenoid, the only abductor) are responsible for moving the vocal cords, an injury to the RLN leads to vocal cord paralysis [1]. In unilateral injury, the cord assumes a paramedian position; in bilateral injury, airway obstruction can occur [1]. **Analysis of Incorrect Options:** * **External laryngeal nerve:** This nerve supplies only the **cricothyroid muscle**, which acts as a tensor of the vocal cords. Injury results in a weak, husky voice and loss of high-pitched notes, but not true paralysis of the cords. * **Internal laryngeal nerve:** This is a purely **sensory** nerve. It supplies the laryngeal mucosa above the level of the vocal cords. Injury leads to loss of the cough reflex, increasing the risk of aspiration, but does not affect cord mobility. * **Superior laryngeal nerve:** This is the parent trunk that divides into the internal and external branches. While its injury affects voice quality and sensation, "vocal cord paralysis" specifically refers to the loss of abduction/adduction governed by the RLN. **High-Yield Clinical Pearls for NEET-PG:** * **Posterior Cricoarytenoid:** The "Safety Muscle" of the larynx (the only abductor). * **Semon’s Law:** In progressive lesions of the RLN, abductor fibers are injured first; thus, the cord initially moves to the midline. * **Surgery Risk:** The RLN is most commonly injured during **thyroidectomy** due to its close proximity to the inferior thyroid artery [1]. * **Left vs. Right:** The left RLN has a longer course, looping around the arch of the aorta, making it more susceptible to thoracic pathologies [1].

Question 89: Which of the following cervical joints primarily facilitates the rotation of the head to the right or left?

A. Atlanto-occipital joint
B. Atlanto-axial joint (Correct Answer)
C. C2-C3 joint
D. C3-C4 joint

Explanation: **Explanation:** The **Atlanto-axial joint (C1-C2)** is a complex of three synovial joints: one median pivot joint (between the dens of the axis and the anterior arch of the atlas) and two lateral plane joints. The primary function of this joint is **rotation**, contributing to approximately 50% of the total cervical rotation. When you shake your head to signify "No," the atlas (C1) rotates around the dens (odontoid process) of the axis (C2). This movement is limited by the alar ligaments. **Analysis of Incorrect Options:** * **Atlanto-occipital joint (C0-C1):** This is a condylar synovial joint primarily responsible for **flexion and extension** (the "Yes" movement/nodding). It allows for very little lateral flexion and negligible rotation. * **C2-C3 and C3-C4 joints:** These are typical cervical vertebrae joints consisting of an intervertebral disc and zygapophyseal (facet) joints. While they contribute to the overall range of motion of the neck (flexion, extension, and lateral bending), they are not the primary site for head rotation. **High-Yield NEET-PG Pearls:** * **The "No" Joint:** Atlanto-axial joint (Rotation). * **The "Yes" Joint:** Atlanto-occipital joint (Flexion/Extension). * **Cruciate Ligament:** The transverse ligament of the atlas is the most important component, holding the dens against the atlas. Rupture (e.g., in Rheumatoid Arthritis or trauma) can lead to fatal spinal cord compression. * **Steel’s Rule of Thirds:** At the level of the atlas, the vertebral canal is occupied by 1/3rd dens, 1/3rd spinal cord, and 1/3rd "safe space" (fluid and fat).

Question 90: A 22-year-old male soccer player experiences decreased range of motion at the atlantoaxial joint following a head-to-head collision. What movement of the head would most likely be severely affected due to slight dislocation of this joint?

A. Rotation (Correct Answer)
B. Flexion
C. Abduction
D. Extension

Explanation: **Explanation:** The **atlantoaxial joint** is a complex of three synovial joints between the first (C1/Atlas) and second (C2/Axis) cervical vertebrae. It consists of two lateral plane joints and one median pivot joint (formed by the dens of the axis and the anterior arch of the atlas). **Why Rotation is the Correct Answer:** The primary physiological function of the atlantoaxial joint is **rotation** of the head (the "No" movement). Approximately 50% of all cervical rotation occurs at this level. The pivot mechanism of the dens acting as an axle allows the atlas to rotate freely around it. Therefore, any dislocation or subluxation at this joint will most severely restrict rotational range of motion. **Analysis of Incorrect Options:** * **Flexion and Extension (B & D):** These movements (the "Yes" movement) primarily occur at the **atlanto-occipital joint** (between the atlas and the occipital condyles). While the rest of the cervical spine contributes to these movements, the atlantoaxial joint's contribution is minimal. * **Abduction (C):** In the context of the neck, this refers to lateral flexion. Lateral flexion is primarily a function of the middle and lower cervical spine (C3-C7); it does not occur at the atlantoaxial joint. **NEET-PG High-Yield Pearls:** * **Cruciate Ligament:** The transverse ligament of the atlas is the most important structure stabilizing the atlantoaxial joint. Its rupture (e.g., in Rheumatoid Arthritis or trauma) can lead to fatal spinal cord compression. * **"No" vs. "Yes" Joints:** Remember **A**tlanto-**O**ccipital = **O**K (Nodding/Yes); **A**tlanto-**A**xial = **A**round (Rotation/No). * **Innervation:** The joints of the upper cervical spine are supplied by the C1 and C2 spinal nerves.

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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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