in taxon develops from develops from composed primarily of Theria <mammals> auditory ossicle bone incus bone quadrate - incus MA:0001215 FMA:52752 The incus or anvil is the anvil-shaped small bone or ossicle in the middle ear. It connects the malleus to the stapes. It was first described by Alessandro Achillin of Bologna. The incus transmits sound vibrations from the malleus to the stapes. The incus only exists in mammals, and is derived from a reptilian upper jaw bone, the quadrate bone. Embryologically it is derived from the first pharyngeal arch along with the rest of the bones of mastication, such as the maxilla and mandible. [WP,unvetted]. incus bone SCTID:272649008 Wikipedia:Incus UBERON:0001688 EMAPA:18583 NCIT:C32770 incus GAID:866 MESH:D007188 bone tissue endochondral bone incus cartilage element incus endochondral element