Plate 3: Inner Wall of Middle Ear (Membranous labyrinth in transparency): (1) Facial Nerve - (2) Stapedius Muscle - (3) Round Window - (4) Internal Jugular Vein - (5) Internal Carotid Artery - (6)Eustachian Tube - (7) Posterior semicircular Canal - (8) Horizontal semicircular Canal - (9) Superior semicircular Canal - (10) Stapes in Oval Window - (11) Cochlea - (12) Tensor tympani Muscle