part of part of has part has part pharyngeal arch 2 pharyngeal arch 3 pharyngeal pouch pharyngeal pouch 2 2nd arch branchial pouch 2nd arch branchial pouch endoderm 2nd arch pouch endoderm 2nd branchial pouch 2nd pharyngeal pouch endoderm 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] A pharyngeal puch that is between the pharyngeal arches 2 and 3. A pouch that is situated between the 2nd and 3rd pharyngeal arch. [ISBN10:0124020607][VHOG] AAO:0011115 Contributes to the middle ear, epithelial lining of Crypts (spaces) of the palatine tonsils, supplied by the facial nerve EFO:0003633 EHDAA2:0000058 EMAPA:16275 EMAPA:16276 FMA:295676 RETIRED_EHDAA2:0000060 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] TAO:0001130 UBERON:0005715 UBERON:0007123 UMLS:C0231069 VHOG:0000561 VHOG:0000967 XAO:0000247 ZFA:0001130 pharyngeal pouches 2 second arch pharyngeal pouch second pharyngeal pouch second visceral 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. uberon visceral pouch 2