Uberon Development note : The endoderm lines the future auditory tube (Pharyngotympanic Eustachian tube) , middle
ear, mastoid antrum, and inner layer of the tympanic membrane. & origin of Mandibular
nerve & Maxillary artery;
Uberon Homology note : In all jawed vertebrates the first arch forms the jaw, while the second arch forms
the hyoid apparatus. These two arches are separated by the first pharyngeal pouch
and cleft.[well established][VHOG];