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What is Pyriform sinus is laterally bounded by what ? and explain in detail?
Ans. is `d' i.e., Thyrohyoid membrane It lies on either side of the larynx and extends from pharyngoepiglottic fold to the upper end of esophagus. ? It is bounded by :- i) Superiorly - Pharyngoepiglottic folds ii) Inferiorly - Lower border of cricoid iii) Laterally - Thyrohyoid membrane and thyroid cailage iv) Medially - Aryepiglottic fold Posterolateral surface of arytenoids and cricoid cailages