Pyriform sinus

The pyriform sinus (also spelled piriform sinus and also known as the pyriform recesspyriform fossa, and smuggler's fossa) is the pear-shaped subsite of the hypopharynx located posterolaterally to either side of the laryngeal opening.

The structure is a depression bounded

Beneath the mucous membrane of the anterior wall runs the internal laryngeal nerve, a branch of the superior laryngeal nerve.

The term is derived from the Latin "pirum" and -form, meaning having the form of a pear.

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Article information

rID: 64016
System: Head & Neck
Section: Anatomy
Synonyms or Alternate Spellings:
  • pyriform recess
  • pyriform fossa
  • piriform recess
  • piriform fossa
  • pyriform sinus

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Cases and figures

  • Case 1: normal barium swallow
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  • Case 2: pyriform sinus squamous cell carcinoma
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