1. Development of digestive system 1)derivatives of pharyngeal pouch pharyngeal pouch /outpocketings of endodermal lining of the primary pharynx (extends from the buccopharyngeal membrane the tracheobronchial diverticulum) /5 pairs 第⊥咽囊 2咽囊 第3咽囊Z 第4咽囊 第5咽囊1. Development of digestive system 1) derivatives of pharyngeal pouch ---pharyngeal pouch: /outpocketings of endodermal lining of the primary pharynx (extends from the buccopharyngeal membrane to the tracheobronchial diverticulum) /5 pairs