Neck Practice Questions

Q: In which anatomical structure is Killian's dehiscence observed?

Inferior constrictor. ***Inferior constrictor*** - Killian's dehiscence is a triangular area of muscular weakness located in the posterior pharyngeal wall, specifically between the **thyropharyngeus** and **cricopharyngeus** parts of the inferior constrictor muscle. - This anatomical weakness is a common site for the formation of **Zenker's diverticulum** (posterior pharyngeal diverticulum). *Superior constrictor* - The superior constrictor muscle is located higher in the pharynx, forming the posterior and lateral walls of the **nasopharynx** and **oropharynx**. - Its weakness would not lead to Killian's dehiscence, which arises from the **hypopharynx**. *Middle constrictor* - The middle constrictor muscle is situated between the superior and inferior constrictor muscles, originating from the **hyoid bone**. - This muscle is not associated with the specific area of weakness known as Killian's dehiscence. *Stylopharyngeus* - The stylopharyngeus is a longitudinal muscle of the pharynx that passes between the superior and middle constrictors to insert into the pharyngeal wall. - It is not a constrictor muscle and is not associated with Killian's dehiscence, which occurs specifically in the **inferior constrictor**.

Q: What primarily prevents the upward movement of the thyroid gland?

Berry ligament. ***Berry ligament*** - The **Berry ligament (suspensory ligament of Berry)** is a thickening of the **pretracheal fascia** that firmly attaches the thyroid gland to the cricoid cartilage and the first two tracheal rings [1]. - This strong anatomical connection anchors the thyroid gland in place, preventing its excessive upward movement during swallowing [1]. *Pretracheal fascia* - The **pretracheal fascia** encloses the thyroid gland and extends from the hyoid bone to the thorax, investing the trachea and esophagus. - While it surrounds and offers some support to the thyroid, it is the specialized thickening known as the **Berry ligament** that provides the critical anchoring function against upward movement [1]. *Sternothyroid muscle* - The **sternothyroid muscle** is an infrahyoid muscle that depresses the thyroid cartilage and larynx. - Its primary action is to lower the larynx and hyoid bone, not to prevent the upward movement of the thyroid gland itself. *Investing layer of the deep cervical fascia* - The **investing layer of the deep cervical fascia** completely encircles the neck, enclosing the trapezius and sternocleidomastoid muscles and providing a general boundary for the neck contents. - It does not directly attach to the thyroid gland in a manner that would specifically restrict its upward movement; this function is performed by the Berry ligament [1].

Q: Retropharyngeal space extends up to which of the following levels?

Base of skull to bifurcation of trachea. ***Base of skull to bifurcation of trachea*** - The **retropharyngeal space** extends superiorly from the **base of the skull**. - Inferiorly, it reaches the level of the **bifurcation of the trachea (T4-T5 vertebral levels)**, where the alar fascia fuses with the visceral fascia. *Base of skull to C6 vertebra* - This description is too restrictive; the retropharyngeal space extends beyond the **C6 vertebra**. - While significant structures are at C6 (e.g., cricoid cartilage), it is not the inferior limit of this space. *Base of skull to the level of diaphragm* - This is an overestimation of the extent of the **retropharyngeal space**. - The space terminates well above the **diaphragm**, near the tracheal bifurcation. *Base of skull to cricoid cartilage* - The **cricoid cartilage** is located at the level of **C6**, which is an insufficient inferior limit for the **retropharyngeal space**. - The space descends further into the mediastinum.

Q: Shrugging of shoulder following neck surgery is due to injury to:

Spinal accessory nerve. Spinal accessory nerve - Injury to the spinal accessory nerve (cranial nerve XI) can lead to weakness or paralysis of the trapezius muscle, which is responsible for shrugging the shoulder. - Due to its superficial course in the posterior cervical triangle, it is vulnerable to iatrogenic injury during neck surgery, lymph node biopsies, or neck dissections. Thoracodorsal nerve - The thoracodorsal nerve innervates the latissimus dorsi muscle, which is involved in adduction, extension, and internal rotation of the arm [1]. - Injury to this nerve would primarily affect these arm movements, not shoulder shrugging. Bell's nerve - This term is often used to refer to the long thoracic nerve (nerve to serratus anterior). - Injury to the long thoracic nerve leads to scapular winging due to serratus anterior paralysis, but not directly to impaired shoulder shrugging. Vagus nerve - The vagus nerve (cranial nerve X) has widespread functions including innervation of the pharynx, larynx, and thoracic/abdominal viscera. - Injury to the vagus nerve typically causes symptoms like dysphagia, hoarseness, or autonomic dysfunction, unrelated to shoulder movement.

Q: All of the following structures are associated with the laryngeal sinus of Morgagni (laryngeal ventricle) except which one?

Stylopharyngeus. ⚠️ **CRITICAL ISSUE: This question is fundamentally flawed and should be reviewed for deletion or complete reconstruction.** **Problem:** ALL four options are equally unassociated with the laryngeal ventricle (sinus of Morgagni). The laryngeal ventricle is an internal laryngeal structure bounded by the vestibular and vocal folds. None of the listed structures (auditory tube, levator veli palatini, stylopharyngeus, ascending palatine artery) have any anatomical association with the laryngeal ventricle - they are all pharyngeal or palatine structures. **Structures actually associated with laryngeal ventricle:** - Laryngeal saccule (extends from ventricle) - Vestibular fold (superior boundary) - Vocal fold (inferior boundary) - Thyroarytenoid muscle - Laryngeal mucous glands ***Stylopharyngeus*** (Currently marked correct) - Pharyngeal muscle originating from styloid process - NOT associated with laryngeal ventricle *Auditory tube* - Nasopharyngeal structure connecting to middle ear - NOT associated with laryngeal ventricle *Levator veli palatini* - Soft palate muscle - NOT associated with laryngeal ventricle *Ascending palatine artery* - Supplies soft palate and tonsils - NOT associated with laryngeal ventricle **Recommendation:** This question requires complete reconstruction with anatomically appropriate options.

Q: The arterial supply of the submandibular gland is

Facial artery. ***Facial artery*** - The **facial artery** gives off several branches that supply the submandibular gland, including the glandular branches. - It arises from the **external carotid artery** and reaches the gland by looping over the posterior belly of the digastric muscle. *Lingual artery* - The **lingual artery** primarily supplies the tongue and floor of the mouth. - While in close proximity, it does not directly provide the main arterial supply to the submandibular gland. *External carotid artery* - The **external carotid artery** is the parent vessel from which the facial artery (and lingual artery) originate. - It does not directly supply the submandibular gland; rather, its branches do. *Sublingual arteries* - **Sublingual arteries** are branches of the lingual artery and primarily supply the sublingual gland and floor of the mouth. - They do not contribute significantly to the arterial supply of the submandibular gland.

Q: Ascending pharyngeal artery is a branch of which?

External carotid artery. ***External carotid artery*** - The **ascending pharyngeal artery** is typically the first or second branch arising from the medial aspect of the **external carotid artery**. - It supplies structures in the pharynx, prevertebral muscles, palatine tonsil, and parts of the cranial nerves. *Arch of aorta* - The **arch of the aorta** gives rise to major arteries like the brachiocephalic trunk, left common carotid artery, and left subclavian artery [1]. - It does not directly supply arteries to the pharynx or neck at this level. *Inferior thyroid artery* - The **inferior thyroid artery** is a branch of the **thyrocervical trunk**, which in turn arises from the first part of the subclavian artery. - This artery mainly supplies the thyroid gland and adjacent structures but not directly the pharynx from this origin; the recurrent laryngeal nerve is often found in close proximity to its main trunk [1]. *Superior thyroid artery* - The **superior thyroid artery** is a direct branch of the **external carotid artery**, similar to the ascending pharyngeal artery, but it primarily supplies the thyroid gland, larynx, and infrahyoid muscles. - While it originates from the same major artery, it is a distinct branch with a different main distribution.

Q: Which of the following muscles elevates the larynx?

Thyrohyoid. ***Thyrohyoid*** - The **thyrohyoid muscle** connects the **thyroid cartilage** of the larynx to the **hyoid bone**. - Its contraction pulls the thyroid cartilage superiorly towards the hyoid bone, thereby **elevating the entire larynx**. *Sternothyroid* - This muscle extends from the **sternum** to the **thyroid cartilage**. - Its primary action is to **depress the larynx** by pulling the thyroid cartilage inferiorly. *Sternohyoid* - The **sternohyoid muscle** originates from the **sternum** and inserts onto the **hyoid bone**. - Its function is to **depress the hyoid bone** and, consequently, the larynx during swallowing or vocalization. *Omohyoid* - The **omohyoid muscle** has superior and inferior bellies connecting the **scapula** to the **hyoid bone**. - Its main roles are to **depress the hyoid bone** and retract it, rather than elevating the larynx.

Q: Pyriform sinus is laterally bounded by which structure?

Thyroid cartilage. Thyroid cartilage - The pyriform sinus (or pyriform fossa) is a pear-shaped recess located on either side of the laryngeal inlet. - Laterally, it is bounded by the thyroid cartilage and the thyrohyoid membrane, which together form its outer wall. - The thyroid cartilage is the primary and most prominent structure forming the lateral boundary, making it the most accurate answer. Thyrohyoid membrane - The thyrohyoid membrane connects the hyoid bone to the thyroid cartilage and forms part of the lateral wall of the pyriform sinus along with the thyroid cartilage. - While anatomically contributing to the lateral boundary, the thyroid cartilage is typically cited as the primary lateral boundary structure in anatomical texts. Interarytenoid area - This area is located posteriorly between the arytenoid cartilages, forming part of the posterior wall of the pharynx. - It does not form the lateral boundary of the pyriform sinus. Epiglottis - The epiglottis is a leaf-shaped cartilage located anterior to the laryngeal inlet. - It forms the medial boundary anteriorly (via the aryepiglottic fold) but not the lateral boundary of the pyriform sinus.

Q: What is the typical position of the vocal cords in a cadaver at rest?

Neutral position (typical at rest in a cadaver). ***Neutral position (typical at rest in a cadaver)*** - In a cadaver, the muscles controlling vocal cord movement are no longer active, leading to a **flaccid state**. - This flaccid state results in the vocal cords resting in a **paramedian or neutral position**, which is between full abduction and full adduction. *Closed position (as seen during phonation)* - This position requires the active contraction of **adductor muscles** (e.g., lateral cricoarytenoid), which is absent in a cadaver. - Vocal cords are fully adducted during **phonation** to vibrate and produce sound. *Slightly adducted position* - While "neutral" can be considered slightly adducted relative to maximal abduction, this option doesn't fully capture the **passive, flaccid state** of a cadaver. - Active slight adduction is usually a **conscious muscular effort** in a living person. *Widely separated position (as seen during deep inspiration)* - This position, also known as **full abduction**, requires active contraction of the **posterior cricoarytenoid muscles** to open the glottis widely for maximal airflow. - In a cadaver, these muscles are inactive, so the vocal cords cannot maintain this **abducted state**.

Question 1

In which anatomical structure is Killian's dehiscence observed?

Accepted Answer

Inferior constrictor

Answer

Superior constrictor

Answer

Middle constrictor

Answer

Stylopharyngeus

Question 2

What primarily prevents the upward movement of the thyroid gland?

Accepted Answer

Berry ligament

Answer

Pretracheal fascia

Answer

Sternothyroid muscle

Answer

Investing layer of the deep cervical fascia

Question 3

Retropharyngeal space extends up to which of the following levels?

Accepted Answer

Base of skull to bifurcation of trachea

Answer

Base of skull to C6 vertebra

Answer

Base of skull to the level of diaphragm

Answer

Base of skull to cricoid cartilage

Question 4

Shrugging of shoulder following neck surgery is due to injury to:

Accepted Answer

Spinal accessory nerve

Answer

Vagus nerve

Answer

Thoracodorsal nerve

Answer

Bell's nerve

Question 5

All of the following structures are associated with the laryngeal sinus of Morgagni (laryngeal ventricle) except which one?

Accepted Answer

Stylopharyngeus

Answer

Auditory tube

Answer

Levator veli palatini

Answer

Ascending palatine artery

Question 6

The arterial supply of the submandibular gland is

Accepted Answer

Facial artery

Answer

Lingual artery

Answer

External carotid artery

Answer

Sublingual arteries

Question 7

Ascending pharyngeal artery is a branch of which?

Accepted Answer

External carotid artery

Answer

Arch of aorta

Answer

Inferior thyroid artery

Answer

Superior thyroid artery

Question 8

Which of the following muscles elevates the larynx?

Accepted Answer

Thyrohyoid

Answer

Sternothyroid

Answer

Sternohyoid

Answer

Omohyoid

Question 9

Pyriform sinus is laterally bounded by which structure?

Accepted Answer

Thyroid cartilage

Answer

Epiglottis

Answer

Thyrohyoid membrane

Answer

Interarytenoid area

Question 10

What is the typical position of the vocal cords in a cadaver at rest?

Accepted Answer

Neutral position (typical at rest in a cadaver)

Answer

Slightly adducted position

Answer

Widely separated position (as seen during deep inspiration)

Answer

Closed position (as seen during phonation)

Neck — MCQs

Neck — MCQs

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