anatomical cavity piriform sinus 2022-07-05T11:30:55Z UBERON:8480022 A recess on either side of the laryngeal orifice, which is bounded medially by the aryepiglottic fold, laterally by the thyroid cartilage and thyrohyoid membrane. The pyriform sinus is involved in speech. smuggler's fossa pyriform recess pyriform sinus piriform fossa pyriform fossa piriform recess Paula Duek Roggli