Uberon Development note : Contributes to the middle ear, epithelial lining of Crypts (spaces) of the palatine
tonsils, supplied by the facial nerve;
Uberon Homology note : 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];
Uberon Taxon note : 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.;
Semantic type(s)