Neck Practice Questions

Q: The submandibular gland is roughly J-shaped and situated in which anatomical triangle of the neck?

Digastric triangle.. The **submandibular gland** is a large salivary gland that is divided into superficial and deep lobes by the mylohyoid muscle, giving it a characteristic **J-shape**. ### Why the Digastric Triangle is Correct: The **Digastric triangle** (also known as the submandibular triangle) is bounded superiorly by the base of the mandible and inferiorly by the anterior and posterior bellies of the digastric muscle. The superficial part of the submandibular gland occupies nearly the entire volume of this triangle, resting on the mylohyoid and hyoglossus muscles. ### Why Other Options are Incorrect: * **Submental Triangle:** This is a midline triangle bounded by the two anterior bellies of the digastric muscles and the hyoid bone. It contains submental lymph nodes and small veins, but not the submandibular gland. * **Muscular Triangle:** Located in the anterior neck, it contains the infrahyoid (strap) muscles, thyroid gland, and parathyroid glands. It does not house the major salivary glands. ### High-Yield NEET-PG Clinical Pearls: * **Nerve Relations:** The **marginal mandibular branch of the facial nerve** and the **facial vein** pass superficial to the gland, while the **facial artery** grooves its deep surface. * **Wharton’s Duct:** The submandibular duct (Wharton’s duct) emerges from the deep lobe and opens at the sublingual papilla. It is the most common site for **sialolithiasis** (salivary stones) due to its long, upward course and alkaline, calcium-rich secretions. * **Bimanual Palpation:** The gland is best examined by placing one finger in the floor of the mouth and the other externally in the digastric triangle.

Q: The Eustachian tube passes between which structures in the neck?

Above the superior constrictor. ### Explanation The pharyngeal wall is not a continuous sheet of muscle; it contains four distinct gaps (intervals) that allow for the passage of specific structures between the pharynx and the neck. **1. Why the Correct Answer is Right:** The **Eustachian tube** (auditory tube), along with the **levator veli palatini muscle** and the **ascending palatine artery**, passes through the **first gap**. This gap is located **above the superior constrictor muscle**, specifically between the upper border of the muscle and the base of the skull (petrous part of the temporal bone). This space is reinforced by the pharyngobasilar fascia. **2. Analysis of Incorrect Options:** * **Option A (Superior and Middle Constrictors):** This is the **second gap**. It transmits the **stylopharyngeus muscle** and the **glossopharyngeal nerve (CN IX)**. * **Option C (Middle and Inferior Constrictors):** This is the **third gap**. It is pierced by the **internal laryngeal nerve** and the **superior laryngeal artery**. * **Option D (Below the Inferior Constrictor):** This is the **fourth gap**, located between the inferior constrictor and the esophagus. It transmits the **recurrent laryngeal nerve** and the **inferior laryngeal artery**. **3. Clinical Pearls & High-Yield Facts for NEET-PG:** * **Sinus of Morgagni:** The space above the superior constrictor is also known as the Sinus of Morgagni. It is a potential site for the spread of nasopharyngeal carcinoma. * **Passavant’s Ridge:** This is a mucosal ridge formed by the palatopharyngeal sphincter (fibers of the superior constrictor) during swallowing to close the nasopharyngeal isthmus. * **Killian’s Dehiscence:** A weak area between the thyropharyngeal and cricopharyngeal parts of the **inferior constrictor**; it is the most common site for **Zenker’s diverticulum**.

Q: The greater cornua of the hyoid bone typically unite with the body of the hyoid bone at which level?

C3. The **hyoid bone** is a unique, U-shaped bone located in the anterior midline of the neck between the mandible and the thyroid cartilage. It serves as a vital anchor for muscles of the tongue, floor of the mouth, and larynx. **Why C3 is correct:** In a neutral anatomical position, the body of the hyoid bone lies at the level of the **third cervical vertebra (C3)**. The greater cornua (horns) project posteriorly from the lateral ends of the body, maintaining this horizontal plane. This level is a crucial landmark in surface anatomy: it marks the transition where the common carotid artery typically bifurcates into the internal and external carotid arteries. **Why other options are incorrect:** * **C1 (Atlas):** This level corresponds to the base of the skull and the hard palate. The hyoid is situated much lower in the neck. * **C6:** This is a critical landmark for the lower respiratory and digestive tracts. It marks the level of the cricoid cartilage, the start of the trachea, and the junction of the pharynx with the esophagus. * **T1:** This level corresponds to the root of the neck and the apex of the lungs, far below the position of the hyoid bone. **High-Yield Clinical Pearls for NEET-PG:** * **Development:** The body and greater cornua are derived from the **3rd branchial arch**, while the lesser cornua and upper part of the body are derived from the **2nd branchial arch**. * **Unique Feature:** It is the only bone in the human body that **does not articulate** with any other bone; it is suspended by ligaments and muscles. * **Forensic Significance:** A fractured hyoid bone is a classic post-mortem finding strongly suggestive of **strangulation or hanging**.

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

C1. ### 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.

Q: What is the narrowest part of the larynx?

Glottis. ### 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 1

Which of the following is NOT true regarding the suboccipital triangle?

Accepted Answer

Rectus capitis posterior major and minor form the boundaries of the suboccipital triangle.

Answer

Semispinalis capitis forms the roof of the suboccipital triangle.

Answer

The posterior atlantooccipital membrane forms the floor of the suboccipital triangle.

Answer

It contains the third part of the vertebral artery.

Question 2

The external opening of the branchial fistula is nearly always situated in the lower third of the neck, near the anterior border of which of the following muscles?

Accepted Answer

Sternomastoid muscle

Answer

Trapezius muscle

Answer

Masseter muscle

Answer

All of the above

Question 3

The submandibular gland is roughly J-shaped and situated in which anatomical triangle of the neck?

Accepted Answer

Digastric triangle.

Answer

Submental triangle.

Answer

Muscular triangle.

Answer

None of the above.

Question 4

The posterior bellies of the digastric muscle are especially active during which of the following activities?

Accepted Answer

Swallowing and chewing

Answer

Swallowing and speech

Answer

Swallowing and smiling

Answer

Swallowing and frowning

Question 5

What muscles form the floor of the posterior triangle of the neck?

Accepted Answer

Levator scapulae, scalenus posterior, semispinalis capitis, scalenus medius

Answer

Semispinalis capitis, levator scapulae, scalenus anterior, scalenus medius

Answer

Levator scapulae, splenius capitis, scalenus medius, scalenus anterior

Answer

Semispinalis capitis, scalenus anterior, splenius capitis, sternocleidomastoid

Question 6

The Eustachian tube passes between which structures in the neck?

Accepted Answer

Above the superior constrictor

Answer

Superior and middle constrictors

Answer

Middle and inferior constrictor

Answer

Below the inferior constrictor

Question 7

The greater cornua of the hyoid bone typically unite with the body of the hyoid bone at which level?

Accepted Answer

C3

Answer

C1

Answer

C6

Answer

T1

Question 8

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

Accepted Answer

C1

Answer

C2

Answer

C3

Answer

C4

Question 9

What is the narrowest part of the larynx?

Accepted Answer

Glottis

Answer

Ventricle

Answer

Vestibule

Answer

Subglottic space

Question 10

The fascial spaces involved in Ludwig's angina are?

Accepted Answer

Bilateral submandibular, sublingual, and submental spaces

Answer

Unilateral submandibular and sublingual spaces

Answer

Bilateral submandibular and sublingual spaces

Answer

Unilateral submandibular, sublingual, and submental spaces

Neck — MCQs

Neck — MCQs

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