The piriform sinus, also termed recessus, or fossa, pyrifomis, is occasionally described as being part of the larynx, but, since it lies outside of that organ, is, strictly speaking, part of the hypopharynx. It appears as a deep depression between the cricoid and arytenoid cartilages and the posterior surface of the thyroid cartilage on each side of the larynx. It is situated beneath the pharyngoepiglottic fold. Its mucous membrane laterally adjoins the posterior surface of the ala of the thyroid cartilage. In its anterior part is a low fold, the plica nervi laryngei superioris, which is produced by the internal branch of the superior laryngeal nerve and which runs downward and medially (fig. 1). The piriform sinus is limited above by the hyoid bone and below by the lower border of the cricoid cartilage. In many persons, especially those who are not too obese, one can see a white line
SCHUGT HP. THE PIRIFORM SINUS: ANATOMIC AND CLINICAL OBSERVATIONS, WITH A REVIEW OF THE LITERATURE. Arch Otolaryngol. 1940;31(4):626–644. doi:10.1001/archotol.1940.00660010631005
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