Neck Practice Questions

Q: Which of the following is NOT true regarding the scalenus anterior muscle?

The subclavian vein passes posterior to it.. ***The subclavian vein passes posterior to it*** - This is FALSE. The **subclavian vein** passes **anterior** to the scalenus anterior muscle, not posterior to it. - The **subclavian artery** and **brachial plexus** pass **posterior** to the scalenus anterior muscle. - This anatomical relationship makes the scalenus anterior a crucial landmark for the neurovascular structures at the root of the neck. *It is attached to the tubercle of the first rib* - This is TRUE. The scalenus anterior muscle inserts on the **scalene tubercle** of the **first rib**. - This attachment is a key anatomical landmark for structures in the thoracic inlet. *It is not pierced by the phrenic nerve* - This is TRUE. The **phrenic nerve** (C3, C4, C5) descends on the **anterior surface** of the scalenus anterior muscle but does not pierce through it. - This relationship is clinically important for procedures involving the anterior scalene muscle. *It separates the subclavian vein from the subclavian artery* - This is TRUE. The **scalenus anterior muscle** acts as a crucial anatomical separator, with the **subclavian vein** passing **anterior** to it and the **subclavian artery** (along with the brachial plexus) passing **posterior** to it. - This separation defines the important neurovascular relationships in the root of the neck.

Q: Which nerve provides sensory supply to the vocal cords?

Internal laryngeal nerve. ***Internal laryngeal nerve*** - This nerve, a branch of the **superior laryngeal nerve**, is entirely sensory. - It provides **sensation to the laryngeal mucosa from the epiglottis down to and including the vocal folds**. - This is the **primary sensory nerve** to the vocal cords, particularly their superior surface. *Recurrent laryngeal nerve* - This nerve is primarily **motor**, innervating all intrinsic laryngeal muscles except the cricothyroid [1]. - It also provides sensory innervation to the **laryngeal mucosa below the vocal folds** and the inferior surface of the vocal cords [1]. - While it contributes some sensory supply, it is not the primary sensory nerve to the vocal cords. *Superior laryngeal nerve* - This nerve divides into the internal and external laryngeal nerves. - The internal branch provides the sensation, but the **superior laryngeal nerve itself** as a complete nerve trunk is not the specific answer. - The **internal laryngeal branch** is the precise anatomical structure responsible. *All of the options* - This is incorrect because while both internal and recurrent laryngeal nerves contribute sensory fibers, the **internal laryngeal nerve** is recognized as the **primary sensory nerve** to the vocal cords. - The superior laryngeal nerve acts through its internal branch, not as a direct supplier.

Q: Which anatomical structure in the larynx contains the saccules?

Laryngeal ventricles. ***Laryngeal ventricles*** - The **laryngeal ventricles** (also known as the ventricles of Morgagni) are recesses located between the true and false vocal folds. - The **saccules** are anterior extensions of these ventricles, containing numerous mucous glands that lubricate the vocal folds. *Paraglottic space* - The **paraglottic space** is a fat-filled region lateral to the laryngeal ventricles, extending superiorly to the aryepiglottic fold and inferiorly to the conus elasticus. - While it surrounds the ventricle, it does not *contain* the saccule; rather, the saccule invaginates into its superior aspect. *Pyriform fossa* - The **pyriform fossae** are bilateral recesses in the laryngopharynx, lateral to the laryngeal inlet. - They are part of the pharynx, not the intrinsic laryngeal structures, and serve as pathways for food and liquid bypass. *Vocal fold space* - The **vocal fold space** refers to the area encompassing the true vocal folds. - While the saccules are closely associated with the vocal folds, they are specifically housed within the laryngeal ventricles, which are distinct anatomical structures above the true vocal folds.

Q: In the below diagram, the artery marked in complete green originates from the common carotid artery at the level of what anatomical structure?

Superior border of thyroid cartilage. ***Superior border of thyroid cartilage*** - The internal carotid artery (marked in green) typically bifurcates from the **common carotid artery** at the level of the superior border of the **thyroid cartilage**, which is also the level of the **C4 vertebra**. - This anatomical landmark is crucial for identifying the origin of the internal carotid artery during surgical procedures or diagnostic imaging. *Hyoid bone* - The **hyoid bone** is located superior to the thyroid cartilage, at approximately the level of the **C3 vertebra**. - The common carotid artery has not yet bifurcated into internal and external carotid branches at the level of the hyoid bone. *Cricoid cartilage* - The **cricoid cartilage** is located inferior to the thyroid cartilage, at the level of the **C6 vertebra**. - By this point, the common carotid artery has already bifurcated into internal and external carotid arteries. *Inferior border of thyroid cartilage* - The inferior border of the thyroid cartilage is located at approximately the level of the **C5 vertebra**. - The common carotid artery typically bifurcates at a slightly higher level, at the superior border of the thyroid cartilage (C4).

Q: Which of the following muscles is not affected by paralysis of the recurrent laryngeal nerve?

Cricothyroid. ***Cricothyroid*** - This muscle is innervated by the **external branch of the superior laryngeal nerve**, not the recurrent laryngeal nerve. [1] - Its primary function is to **tense the vocal cords**, increasing the pitch of the voice. *Thyroarytenoid* - This muscle is responsible for **relaxing the vocal cords** and closing the rima glottidis. - It receives its innervation from the **recurrent laryngeal nerve**, so it would be affected by its paralysis. [1] *Lateral cricoarytenoid* - This muscle is a primary **adductor of the vocal cords**, closing the rima glottidis. - Its innervation is derived from the **recurrent laryngeal nerve**, making it susceptible to paralysis. [1] *Vocalis* - The vocalis muscle is an intrinsic laryngeal muscle that **adjusts the tension within the vocal folds** and is considered part of the thyroarytenoid muscle. - It is innervated by the **recurrent laryngeal nerve**, and its paralysis would impair vocal fold tension. [1]

Q: Chasaignac's tubercle is located at which anatomical site?

Carotid tubercle on C6 vertebra. ***Carotid tubercle on C6 vertebra*** - **Chasaignac's tubercle** is the prominent **anterior tubercle** of the transverse process of the **sixth cervical vertebra** (C6). - This anatomical landmark is significant because the **common carotid artery** can be compressed against it to control bleeding. *Erbs point* - **Erb's point** on the neck refers to a specific area where several nerves of the **brachial plexus** merge. - It is not a bony prominence like Chasaignac's tubercle, but rather a **neurological landmark** where damage can lead to Erb's palsy. *Found on 1st rib* - The **first rib** has an important bony projection called the **scalene tubercle**, where the **anterior scalene muscle** attaches. - While it is a cervical region bony landmark, it is distinct from Chasaignac's tubercle and serves different anatomical and clinical purposes related to thoracic outlet syndrome. *Medial condyle of humerus* - The **medial condyle of the humerus** is a distal part of the humerus in the elbow region, forming part of the elbow joint. - It is an important landmark for muscle attachments (e.g., common flexor origin) and the ulnar nerve, but it is located in the arm, far from the neck region where Chasaignac's tubercle is found.

Q: Which laryngeal cartilage is elastic?

Epiglottis. ***Epiglottis*** - The **epiglottis** is the **largest** laryngeal cartilage composed of **elastic cartilage**, which allows it to be flexible and return to its original shape after bending. - This flexibility is crucial for its function in covering the laryngeal opening during swallowing, preventing food and liquids from entering the trachea. - It is the **most clinically significant** elastic cartilage of the larynx and the primary answer when asked about elastic laryngeal cartilages. *Corniculate* - **Corniculate cartilages** are small, paired cartilages also composed of **elastic cartilage** (not hyaline). - They are located at the apex of the arytenoid cartilages. - While elastic, they are much smaller and less significant than the epiglottis. *Cuneiform* - **Cuneiform cartilages** are also composed of **elastic cartilage** (not hyaline). - They are small, rod-shaped cartilages located within the aryepiglottic folds. - Like the corniculate cartilages, they are minor elastic cartilages compared to the epiglottis. *Thyroid* - The **thyroid cartilage**, the largest laryngeal cartilage overall, is composed of **hyaline cartilage**. - Its rigid structure provides protection for the vocal cords and forms the anterior wall of the larynx.

Q: Which muscle divides the neck into anterior and posterior triangles?

Sternocleidomastoid. ***Sternocleidomastoid*** - The **sternocleidomastoid muscle** runs obliquely across the neck from the mastoid process to the sternum and clavicle. - It serves as a crucial anatomical landmark, dividing the neck into the **anterior** and **posterior triangles**. *Platysma* - The **platysma** is a superficial muscle of facial expression located in the subcutaneous tissue of the neck. - It does not divide the neck into major anatomical triangles but rather covers the anterior and lateral aspects of the neck. *Digastric* - The **digastric muscle** is a suprahyoid muscle located in the anterior neck region. - It aids in jaw depression and elevation of the hyoid bone, but it is not responsible for dividing the neck into its main triangles. *Trapezius* - The **trapezius muscle** is a broad, flat muscle located in the posterior neck and upper back. - While it forms the posterior boundary of the posterior triangle, it does not divide the neck into anterior and posterior triangles itself.

Q: The lower border of the pharynx is the level of:

C6. ***C6*** - The **pharynx** extends from the base of the skull to the inferior border of the **cricoid cartilage** [1]. - This anatomical landmark, the inferior border of the **cricoid cartilage**, is located at the level of the **C6 vertebra** [1]. *C2* - The C2 vertebra, also known as the **axis**, is significantly higher than the lower border of the pharynx. - It is involved in head rotation and forms part of the **atlantoaxial joint**. *C3* - The C3 vertebra is located higher in the cervical spine and is associated with structures like the hyoid bone, but not the lower pharyngeal border. - It is the approximate level of the **hyoid bone** [1]. *C4* - The C4 vertebra is typically at the level of the superior border of the **thyroid cartilage**, which is still superior to the lower pharynx. - This level is also associated with the bifurcation of the common carotid artery.

Q: Killian's dehiscence is seen in:

Cricopharynx. ***Cricopharynx*** - Killian's dehiscence refers to a **triangular gap** in the posterior wall of the **pharynx**, specifically between the oblique fibers of the **thyropharyngeus muscle** and the transverse fibers of the **cricopharyngeus muscle**. - This anatomical weakness is the most common site for the formation of a **Zenker's diverticulum**, a pouch that can protrude through the pharyngeal wall. *Oropharynx* - The oropharynx is located between the **soft palate** and the **hyoid bone** and is primarily involved in swallowing and breathing. - It does not contain the specific muscular arrangement that creates Killian's dehiscence. *Nasopharynx* - The nasopharynx is the superior part of the pharynx, located behind the **nasal cavity** and extending to the **soft palate**. - Its primary function is in respiration, and it lacks the muscular structures associated with Killian's dehiscence. *Vocal cords* - The vocal cords are located within the **larynx**, inferior to the pharynx, and are essential for **phonation**. - They are unrelated to the muscular structures of the cricopharynx or the formation of Killian's dehiscence.

Question 1

Which of the following is NOT true regarding the scalenus anterior muscle?

Accepted Answer

The subclavian vein passes posterior to it.

Answer

It is attached to the tubercle of the first rib.

Answer

It is not pierced by the phrenic nerve.

Answer

It separates the subclavian vein from the subclavian artery.

Question 2

Which nerve provides sensory supply to the vocal cords?

Accepted Answer

Internal laryngeal nerve

Answer

Recurrent laryngeal nerve

Answer

Superior laryngeal nerve

Answer

All of the options

Question 3

Which anatomical structure in the larynx contains the saccules?

Accepted Answer

Laryngeal ventricles

Answer

Pyriform fossa

Answer

Paraglottic space

Answer

Vocal fold space

Question 4

In the below diagram, the artery marked in complete green originates from the common carotid artery at the level of what anatomical structure?

Accepted Answer

Superior border of thyroid cartilage

Answer

Hyoid bone

Answer

Cricoid cartilage

Answer

Inferior border of thyroid cartilage

Question 5

Which of the following muscles is not affected by paralysis of the recurrent laryngeal nerve?

Accepted Answer

Cricothyroid

Answer

Lateral cricoarytenoid

Answer

Vocalis

Answer

Thyroarytenoid

Question 6

Chasaignac's tubercle is located at which anatomical site?

Accepted Answer

Carotid tubercle on C6 vertebra

Answer

Erbs point

Answer

Found on 1st rib

Answer

Medial condyle of humerus

Question 7

Which laryngeal cartilage is elastic?

Accepted Answer

Epiglottis

Answer

Cuneiform

Answer

Corniculate

Answer

Thyroid

Question 8

Which muscle divides the neck into anterior and posterior triangles?

Accepted Answer

Sternocleidomastoid

Answer

Platysma

Answer

Digastric

Answer

Trapezius

Question 9

The lower border of the pharynx is the level of:

Accepted Answer

C6

Answer

C2

Answer

C3

Answer

C4

Question 10

Killian's dehiscence is seen in:

Accepted Answer

Cricopharynx

Answer

Oropharynx

Answer

Nasopharynx

Answer

Vocal cords

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