Neck Practice Questions

Q: Which of the following muscles is the primary abductor of the larynx?

Posterior cricoarytenoid muscle. ### Explanation The larynx is a complex cartilaginous structure where muscle functions are categorized by their effect on the vocal cords (folds). **Why Option B is Correct:** The **Posterior Cricoarytenoid (PCA)** muscle is the **only abductor** of the vocal folds. It originates from the posterior surface of the cricoid lamina and inserts into the muscular process of the arytenoid cartilage. When it contracts, it rotates the arytenoid cartilages laterally, widening the **rima glottidis** (the space between the cords). This action is vital for respiration; hence, the PCA is often referred to as the **"safety muscle of the larynx."** **Why the Other Options are Incorrect:** * **A. Cricothyroid:** This muscle tilts the thyroid cartilage forward, **tensing and elongating** the vocal cords to increase the pitch of the voice. It is the only laryngeal muscle supplied by the External Laryngeal Nerve. * **C. Thyroarytenoid:** This muscle acts to **relax** the vocal folds. Its medial fibers (Vocalis) allow for fine-tuning of tension during phonation. * **D. Lateral cricoarytenoid:** This is the primary **adductor** of the vocal folds. It rotates the arytenoids medially to close the rima glottidis, essential for phonation and protecting the airway. **High-Yield NEET-PG Pearls:** 1. **Nerve Supply:** All intrinsic muscles of the larynx are supplied by the **Recurrent Laryngeal Nerve (RLN)**, *except* the Cricothyroid (External Laryngeal Nerve). 2. **Clinical Correlation:** Bilateral RLN injury leads to paralysis of the PCA muscles, causing the vocal cords to remain adducted in the midline. This results in acute airway obstruction and requires an emergency tracheostomy. 3. **Mnemonic:** **P**osterior **C**ricoarytenoid **P**ulls the cords apart (**A**bduction).

Q: An angiographic study of the distal part of the circle of Willis requires access to the vertebral artery. Access to this artery can be obtained via which anatomical region?

Suboccipital triangle. The vertebral artery is divided into four segments (V1–V4). The third segment (V3) is the portion that lies within the suboccipital triangle. After emerging from the foramen transversarium of the atlas (C1), the artery winds backward around the lateral mass of the atlas and lies in a groove on the upper surface of its posterior arch. This specific location within the suboccipital triangle makes it surgically and radiographically accessible before it pierces the posterior atlanto-occipital membrane to enter the skull. Analysis of Options: * Suboccipital triangle (Correct): Contains the V3 segment of the vertebral artery and the suboccipital nerve (dorsal ramus of C1). It is bounded by the Rectus capitis posterior major, Obliquus superior, and Obliquus inferior muscles. * Anterior triangle: Contains the carotid sheath (common carotid, internal jugular vein, and vagus nerve), but the vertebral artery lies deeper, protected by the prevertebral fascia and transverse processes. * Muscular triangle: A subdivision of the anterior triangle containing infrahyoid muscles and the thyroid gland; it does not provide access to the vertebral artery. * Posterior triangle: While the vertebral artery passes deep to this area, it is not a standard point of access compared to the suboccipital region where the artery is relatively superficial in its groove on C1. Clinical Pearls for NEET-PG: * Course: The vertebral artery typically enters the transverse foramen of the C6 vertebra (not C7). * Circle of Willis: The two vertebral arteries join at the lower border of the pons to form the Basilar artery. * Suboccipital Triangle Floor: Formed by the posterior atlanto-occipital membrane and the posterior arch of the atlas. * Vertebral Artery Insufficiency: Can be triggered by extreme rotation of the head, as the V3 segment is vulnerable to compression within this triangle.

Q: In surgery of the submandibular salivary gland, which nerve is often involved?

Facial nerve. The correct answer is the **Facial nerve**, specifically its **Marginal Mandibular branch**. During submandibular gland excision, this nerve is the most frequently injured structure because it descends below the lower border of the mandible, passing superficial to the submandibular gland and the facial artery within the investing layer of deep cervical fascia. **Why the other options are incorrect:** * **Hypoglossal nerve (CN XII):** This nerve lies deep to the submandibular gland, resting on the hyoglossus muscle. While it is at risk during deep dissection, it is protected by the mylohyoid muscle and is less commonly involved than the superficial marginal mandibular branch. * **Glossopharyngeal nerve (CN IX):** This nerve is located much higher and deeper in the oropharynx/tonsillar fossa region. It is not typically encountered during routine submandibular gland surgery. * **Lingual nerve:** This nerve is closely related to the submandibular duct (Wharton’s duct), where it "loops" under the duct. **NEET-PG High-Yield Pearls:** 1. **Hayes’ Maneuver:** To protect the marginal mandibular nerve, the incision is made 2–3 cm below the lower border of the mandible, and the distal end of the facial vein is ligated and retracted superiorly to "lift" the nerve out of the surgical field. 2. **Nerve-Duct Relationship:** The Lingual nerve crosses the submandibular duct twice (lateral to medial) and is often described as "triple-related" to the duct. 3. **Ganglion:** The submandibular ganglion (parasympathetic) "hangs" from the lingual nerve and supplies secretomotor fibers to the gland.

Q: Which artery supplies the cricothyroid muscle?

External laryngeal artery. ### Explanation The **cricothyroid muscle** is unique among the intrinsic muscles of the larynx because it is the only one located on the external surface and the only one supplied by the **external laryngeal nerve**. Its arterial supply follows this nerve. **1. Why the Correct Answer is Right:** The **External laryngeal artery** is a branch of the **superior thyroid artery** (which originates from the external carotid). It travels alongside the external laryngeal nerve to pierce the cricothyroid membrane or supply the muscle directly [2]. In many anatomical texts, this is also referred to as the **cricothyroid artery**. **2. Why the Other Options are Wrong:** * **Recurrent laryngeal artery:** This is a branch of the inferior thyroid artery. it accompanies the recurrent laryngeal nerve and supplies the internal muscles of the larynx (except the cricothyroid) [1]. * **Internal laryngeal artery:** This is a branch of the superior laryngeal artery. It accompanies the internal laryngeal nerve and pierces the thyrohyoid membrane to provide sensory supply to the supraglottis; it does not supply the external cricothyroid muscle. * **Superior laryngeal artery:** While this is the parent trunk (branch of the superior thyroid artery), it specifically pierces the thyrohyoid membrane to supply the interior of the larynx. **3. High-Yield Clinical Pearls for NEET-PG:** * **The "Singer’s Muscle":** The cricothyroid muscle tilts the thyroid cartilage forward, tensing the vocal cords to raise pitch. * **Nerve-Artery Pairing:** * *Superior Laryngeal Artery* travels with the *Internal Laryngeal Nerve*. * *Cricothyroid (External Laryngeal) Artery* travels with the *External Laryngeal Nerve*. * **Surgical Risk:** During a thyroidectomy, the external laryngeal nerve and its accompanying artery are at risk when ligating the **superior thyroid artery** near the upper pole of the thyroid gland [2].

Q: All of the following muscles are attached to the oblique line of the thyroid cartilage except?

Superior constrictor. The **oblique line** of the thyroid cartilage is a crucial anatomical landmark located on the external surface of the thyroid lamina. It serves as a site of attachment for three specific muscles. ### Why "Superior Constrictor" is the Correct Answer The **Superior constrictor** muscle does not attach to the thyroid cartilage. Instead, it originates from the pterygoid hamulus, the pterygomandibular raphe, and the posterior end of the mylohyoid line of the mandible. Its primary role is in the upper pharynx. ### Explanation of Other Options (The "TIS" Mnemonic) The three muscles attached to the oblique line can be easily remembered using the mnemonic **"TIS"**: * **T - Thyrohyoid (Option C):** This muscle originates from the oblique line and inserts into the hyoid bone. It elevates the larynx. * **I - Inferior Constrictor (Option B):** Specifically, the **thyropharyngeus** part of the inferior constrictor originates from the oblique line. It is essential for the swallowing reflex. * **S - Sternothyroid (Option D):** This muscle inserts onto the oblique line from its origin on the posterior surface of the manubrium. It acts to depress the larynx. ### NEET-PG High-Yield Pearls * **The Oblique Line Boundaries:** It extends from the superior thyroid tubercle to the inferior thyroid tubercle. * **Clinical Significance:** The oblique line marks the boundary for the **pretracheal fascia**. * **Killian’s Dehiscence:** While the thyropharyngeus (inferior constrictor) attaches to the oblique line, the cricopharyngeus attaches to the cricoid cartilage. The potential gap between these two parts is Killian’s Dehiscence, the site for **Zenker’s diverticulum**. * **Innervation:** The Thyrohyoid is unique among infrahyoid muscles as it is supplied by **C1 via the hypoglossal nerve**, whereas the others are supplied by the Ansa cervicalis.

Q: Which of the following is an unpaired laryngeal cartilage?

Cricoid. The larynx is composed of **nine cartilages**: three are unpaired (single) and three are paired (doubles). Understanding this classification is a high-yield topic for NEET-PG. ### **Explanation of the Correct Answer** **C. Cricoid:** This is an **unpaired** cartilage. It is the only complete cartilaginous ring encircling the airway, shaped like a "signet ring" (broad posterior lamina and narrow anterior arch). It is located at the level of the **C6 vertebra**, marking the junction between the larynx and trachea. [1] The other two unpaired cartilages are: 1. **Thyroid:** The largest, shield-shaped cartilage. 2. **Epiglottis:** A leaf-shaped fibroelastic cartilage. ### **Explanation of Incorrect Options** * **A. Cuneiform:** These are small, club-shaped **paired** cartilages located within the aryepiglottic folds. They provide support to the vocal folds. * **B. Arytenoid:** These are pyramidal **paired** cartilages that sit atop the cricoid lamina. They are crucial for speech as they serve as the attachment point for the vocal ligaments and the muscles that adduct/abduct the vocal cords. * The third pair (not listed) is the **Corniculate** cartilages, which sit on the apices of the arytenoids. ### **High-Yield Clinical Pearls for NEET-PG** * **Histology:** All laryngeal cartilages are **Hyaline** (and thus prone to calcification with age) EXCEPT for the **Epiglottis**, **Cuneiform**, and the **apex of the Arytenoid**, which are **Elastic** cartilage. * **Surgical Landmark:** The cricoid cartilage (C6) is the landmark for the beginning of the esophagus and the point where the recurrent laryngeal nerve enters the larynx. [1] * **Safety:** The **Cricothyroid membrane** (between the thyroid and cricoid) is the site for emergency cricothyroidotomy.

Q: Location of the piriformis fossa?

Laryngeal part of the pharynx. The **Piriform fossa** (also known as the piriform recess or sinus) is a deep, pear-shaped mucosal depression located on either side of the laryngeal inlet. It is a vital component of the **Laryngopharynx** (the laryngeal part of the pharynx), which extends from the upper border of the epiglottis to the lower border of the cricoid cartilage (C6 level). **Why Option C is correct:** The piriform fossa is bounded medially by the aryepiglottic fold and laterally by the thyroid cartilage and thyrohyoid membrane. Since these structures form the framework of the laryngopharynx, the fossa is anatomically situated within this specific division of the pharynx. **Why other options are incorrect:** * **Nasopharynx (A):** This is the uppermost part of the pharynx, located behind the nasal cavity. Key structures here include the pharyngeal tonsils (adenoids) and the opening of the Eustachian tube. * **Oropharynx (B):** This lies between the soft palate and the epiglottis. It contains the palatine tonsils and the vallecula, but not the piriform fossa. **Clinical Pearls for NEET-PG:** 1. **Foreign Bodies:** The piriform fossa is a common site for the lodgement of swallowed foreign bodies (e.g., fish bones). 2. **Nerve Supply:** The **Internal Laryngeal Nerve** (a branch of the Superior Laryngeal Nerve) lies just beneath the mucous membrane of the fossa. This nerve provides sensory supply to the larynx above the vocal cords. 3. **Clinical Significance:** Injury to the internal laryngeal nerve during the removal of a foreign body from the piriform fossa can lead to anesthesia of the laryngeal supraglottis, increasing the risk of aspiration. 4. **Cancer:** It is a "hidden" site for hypopharyngeal carcinomas, which may remain asymptomatic until advanced.

Q: Which of the following structures move with deglutition?

All of the above. The movement of structures during deglutition (swallowing) is a high-yield concept in head and neck anatomy. The fundamental principle is that any structure **attached to or enclosed within the pretracheal fascia** will move superiorly during swallowing because the fascia is attached to the hyoid bone and the thyroid cartilage, which are elevated by the suprahyoid muscles. ### **Detailed Breakdown:** * **Thyroglossal Cyst:** This is the most classic example. Because the thyroglossal duct is intimately associated with the descent of the thyroid gland and often hooks around the **hyoid bone**, the cyst moves upward during deglutition. It is also the only midline swelling that moves with **protrusion of the tongue**. * **Subhyoid Bursa:** Located between the posterior surface of the hyoid bone and the thyrohyoid membrane, this bursa is anatomically tethered to the laryngeal skeleton. As the larynx rises during swallowing, the bursa moves with it. * **Pretracheal & Paratracheal Nodes:** These lymph nodes are located within or deep to the **pretracheal fascia**. Since the entire visceral compartment of the neck (including the trachea, esophagus, and thyroid) is enclosed by this fascia, these nodes move in unison with the trachea during deglutition. ### **Clinical Pearls for NEET-PG:** 1. **Thyroid Swellings:** All thyroid swellings (goiters, adenomas) move with deglutition because the thyroid gland is enclosed by the pretracheal fascia. 2. **Differential Diagnosis:** If a midline neck mass **moves with deglutition but NOT with tongue protrusion**, it is likely a thyroid swelling or a subhyoid bursa, rather than a thyroglossal cyst. 3. **Exceptions:** Laryngocele and submental lymph nodes typically do not move significantly with deglutition compared to the structures mentioned above.

Question 1

Which of the following muscles is the primary abductor of the larynx?

Accepted Answer

Posterior cricoarytenoid muscle

Answer

Cricothyroid muscle

Answer

Thyroarytenoid muscle

Answer

Lateral cricoarytenoid muscle

Question 2

Which of the following statements about the arterial supply of the thyroid gland is NOT true?

Accepted Answer

The parathyroid arteries are a branch arising post-division of the superior thyroid artery.

Answer

The superior thyroid artery is a branch of the external carotid artery.

Answer

The inferior thyroid artery is a branch of the thyrocervical trunk.

Answer

The thyroid ima artery is invariably a branch of the arch of the aorta.

Question 3

An angiographic study of the distal part of the circle of Willis requires access to the vertebral artery. Access to this artery can be obtained via which anatomical region?

Accepted Answer

Suboccipital triangle

Answer

Anterior triangle of the neck

Answer

Muscular triangle of the neck

Answer

Posterior triangle of the neck

Question 4

In surgery of the submandibular salivary gland, which nerve is often involved?

Accepted Answer

Facial nerve

Answer

Hypoglossal nerve

Answer

Glossopharyngeal nerve

Answer

Lingual nerve

Question 5

Which artery supplies the cricothyroid muscle?

Accepted Answer

External laryngeal artery

Answer

Recurrent laryngeal artery

Answer

Internal laryngeal artery

Answer

Superior laryngeal artery

Question 6

All of the following muscles are attached to the oblique line of the thyroid cartilage except?

Accepted Answer

Superior constrictor

Answer

Inferior constrictor

Answer

Thyrohyoid

Answer

Sternothyroid

Question 7

The fascia overlying the posterior triangle of the neck is pierced by which of the following structures?

Accepted Answer

External jugular vein

Answer

Spinal accessory nerve

Answer

Suprascapular nerve

Answer

Internal jugular vein

Question 8

Which of the following is an unpaired laryngeal cartilage?

Accepted Answer

Cricoid

Answer

Cuneiform

Answer

Arytenoid

Answer

None of the above

Question 9

Location of the piriformis fossa?

Accepted Answer

Laryngeal part of the pharynx

Answer

Nasopharynx

Answer

Oropharynx

Answer

None of the above

Question 10

Which of the following structures move with deglutition?

Accepted Answer

All of the above

Answer

Thyroglossal cyst

Answer

Subhyoid bursa

Answer

Pretracheal & Paratracheal nodes

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