Elements of animal physiology, chiefly human . is lined bymucous membrane, studded with the ceruminous or waxglands. (2.) The tympanum, or middle ear, (which consists ofan irregular cavity in the petrous part
Slide show: How you hear - Mayo Clinic
Seashell of Hammer shell (Malleus malleus). Malacology collection. Spain. Europe Stock Photo - Alamy
Malleus - Wikipedia
Evolution of middle ear bones in mammals from jaw bones in reptiles? - creation.com