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The pyriform sinus (also piriform recess, piriform sinus, piriform fossa, or smuggler's fossa) is a small recess on either side of the laryngeal inlet. It is bounded medially by the aryepiglottic fold, and laterally by the thyroid cartilage and thyrohyoid membrane.[1] The fossae are involved in speech.

Etymology

The term "pyriform," which means "pear-shaped," is also sometimes spelled "piriform".[citation needed]

The term smuggler's fossa comes from its use for smuggling of small items.[2]

Structure

Relations

Deep to the mucous membrane of the pyriform fossa lie the recurrent laryngeal nerve as well as the internal laryngeal nerve, a branch of the superior laryngeal nerve.[3] The internal laryngeal nerve supplies sensation to the area, and it may become damaged if the mucous membrane is inadvertently punctured. The pyriform sinus is a subsite of the hypopharynx. This distinction is important for head and neck cancer staging and treatment.[4]

Clinical significance

This sinus is a common place for food particles to become trapped; if foreign material becomes lodged in the piriform fossa of an infant, it may be retrieved nonsurgically. If the area is injured (e.g., by a fish bone), it can give the sensation of food stuck in the subject's throat.[2]

Remnants of the pharyngeal pouches III and IV may extent to the piriform sinus as sinus tracts which are sometimes imprecisely called "fistulas".[5][6] This can result in acute infectious thyroiditis which is more common on the left side of the neck.[7]

References

Public domain This article incorporates text in the public domain from page 1142 of the 20th edition of Gray's Anatomy (1918)

  1. ^ Standring, Susan (2020). Gray's Anatomy: The Anatomical Basis of Clinical Practice (42nd ed.). New York. p. 709. ISBN 978-0-7020-7707-4. OCLC 1201341621.{{cite book}}: CS1 maint: location missing publisher (link)
  2. ^ a b Singh, Vishram (4 March 2014). Textbook of Anatomy Head, Neck, and Brain;. Elsevier Health Sciences. p. 203. ISBN 978-81-312-3627-7.
  3. ^ Moore, K.L., & Agur, A.M.R (2007). Essential Clinical Anatomy: Third Edition. Baltimore: Lippincott Williams & Wilkins. ISBN 978-0-7817-6274-8
  4. ^ AJCC Cancer Staging Handbook: From the AJCC Cancer Staging Manual, Sixth Edition. Ed. Frederick L. Greene, M.D. page 48.
  5. ^ Koch, Bernadette L.; Hamilton, Bronwyn E.; Hudgins, Patricia A.; Harnsberger, H. Ric (22 November 2016). Diagnostic Imaging: Head and Neck E-Book. Elsevier Health Sciences. p. 611. ISBN 978-0-323-44314-2.
  6. ^ Lucente, Frank E.; Har-El, Gady (2004). Essentials of Otolaryngology. Lippincott Williams & Wilkins. pp. 281–2. ISBN 978-0-7817-4707-3.
  7. ^ Gorbach, Sherwood L.; Bartlett, John G.; Blacklow, Neil R. (2004). Infectious Diseases. Lippincott Williams & Wilkins. p. 462. ISBN 978-0-7817-3371-7.

External links

source: https://en.wikipedia.org/wiki/Pyriform_sinus