overlaps overlaps pharyngeal arch 2 pharyngeal arch 3 pharyngeal pouch pharyngeal pouch 2 A conserved feature of all vertebrate embryos is the presence of a series of bulges on the lateral surface of the head, the pharyngeal arches; it is within these structures that the nerves, muscles and skeletal components of the pharyngeal apparatus are laid down. The pharyngeal arches are separated by endodermal outpocketings, the pharyngeal pouches.[well established][VHOG] AAO:0011115 A pharyngeal puch that is between the pharyngeal arches 2 and 3. Wikipedia:Pharyngeal_pouch_(embryology)#Second_pouch 2nd pharyngeal pouch endoderm 2nd branchial pouch TAO:0001130 UBERON:0007123 NCIT:C34289 UMLS:C0231069 EMAPA:16275 2nd arch pouch endoderm visceral pouch 2 2nd arch branchial pouch endoderm EFO:0003633 Contributes to the middle ear, epithelial lining of Crypts (spaces) of the palatine tonsils, supplied by the facial nerve UBERON:0005715 A pouch that is situated between the 2nd and 3rd pharyngeal arch. [ISBN:0124020607][VHOG] RETIRED_EHDAA2:0000060 VHOG:0000967 EHDAA2:0000058 2nd arch branchial pouch second pharyngeal pouch second visceral pouch ZFA:0001130 FMA:295676 pharyngeal pouches 2 second arch pharyngeal pouch the dorsal elongation of the second pouch endoderm of all mammals, with the exception of rodents, gives rise to the epithelial lining of palatine tonsils; in rodents, the ventral portion of the second pouch appears to degenerate whereas the remaining part is incorporated into the lateral border of the pharynx; it appears that rodents no longer require tonsils as their function is carried out by the NALT (Nose/Nasal-Associated Lymphoid Tissue) system in the upper respiratory tract. SCTID:345349000 XAO:0000247 VHOG:0000561 Second of the pharyngeal (endodermal) evaginations between the visceral arches from which the Eustachian tube is derived; pouches 2-4 open as gill slits.[AAO]