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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.
The most common cause of infection in children is a congenital abnormality such as pyriform sinus fistula. [5] In most cases, the infection originates in the piriform sinus and spreads to the thyroid via the fistula. [7] In many reported cases of AIT the infection occurs following an upper respiratory tract infection.
The piriform aperture, pyriform aperture, or anterior nasal aperture is a pear-shaped opening in the human skull. Its long axis is vertical, and narrow end upward; in the recent state it is much contracted by the lateral nasal cartilage and the greater and lesser alar cartilages of the nose .
The epiglottic valleculae are paired spaces between the root of the tongue and anterior surface of the epiglottis.Each vallecula is bordered medially by the median glossoepiglottic fold and laterally by the lateral glossoepiglottic fold.
The piriform cortex, or pyriform cortex, is a region in the brain, part of the rhinencephalon situated in the cerebrum. The function of the piriform cortex relates to the sense of smell . Structure
The function of the sinus cavities within the cranial bone (skull) is not entirely clear. Beliefs about their possible function include: [1] Sinus cavities allow for voice resonance; They help filter and add moisture to any air that is inhaled through the nasal passages and in the removal of unwanted particles from the sinus cavities.
The aryepiglottic folds are triangular folds of mucous membrane of the larynx.They enclose ligamentous and muscular fibres. They extend from the lateral borders of the epiglottis to the arytenoid cartilages, hence the name 'aryepiglottic'.
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