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			File:Gray955.png\|Gray's Anatomy illustration of the larynx
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'''Pyriform Sinus'''

The '''[[Pyriform Sinus]]''' is a part of the [[pharynx]], specifically the [[hypopharynx]], which is located in the [[human body]]. It is an important anatomical structure involved in the process of [[swallowing]] and is closely related to the [[larynx]] and [[esophagus]].

== Anatomy ==

The pyriform sinus is a pear-shaped recess located on either side of the laryngeal orifice. It is bounded medially by the [[aryepiglottic fold]], laterally by the [[thyroid cartilage]] and its base, and inferiorly by the cricoid cartilage. The sinus extends from the level of the [[hyoid bone]] to the [[cricopharyngeus muscle]].

== Function ==

The primary function of the pyriform sinus is to act as a pathway for food and liquid during the process of swallowing. It helps direct these substances into the esophagus, bypassing the larynx to prevent aspiration.

== Clinical Significance ==

The pyriform sinus can be the site of various pathologies, including [[cancer]]. [[Pyriform sinus cancer]] is a type of [[hypopharyngeal cancer]] that can present with symptoms such as hoarseness, difficulty swallowing, and a lump in the neck. It is often diagnosed using [[endoscopy]] and [[biopsy]].

[[Pyriform sinus fistula]] is a rare congenital condition that results from the persistence of the third or fourth [[branchial pouch]]. It can present with recurrent neck infections or abscesses.

== See Also ==

* [[Pharynx]]
* [[Hypopharynx]]
* [[Swallowing]]
* [[Larynx]]
* [[Esophagus]]

== References ==

{{reflist}}

[[Category:Anatomy]]
[[Category:Otorhinolaryngology]]
[[Category:Gastroenterology]]
{{anatomy-stub}}

Pyriform sinus - Revision history

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