![]() It receives its innervation via a motor branch of the trigeminal nerve. The tensor tympani muscle originates rostrally and medially from the bony recess in the petrous portion of the temporal bone and makes its tendinous insertion onto the muscular process of the neck of the malleus ( Fig. The middle ear has two muscles associated with the auditory ossicles that help modulate auditory transduction and a third muscle group that controls patency of the auditory tube. Njaa, in Pathologic Basis of Veterinary Disease (Sixth Edition), 2017 Middle Ear Muscles and Nerves An imaginary line drawn through these two ligaments passes through the center of gravity of the tympano-ossicular system and defines the axis of rotation during auditory stimulation ( Webster, 1961).īoth the tensor tympani and stapedius muscles are very delicate the former inserts upon the manubrium of the malleus and the latter onto the neck of the stapes ( Webster, 1961).īradley L. There are only two suspensory ligaments for the ossicular chain: the anterior ligament of the malleus, which is attached to its anterior process, and the posterior ligament of the incus, which is attached to its short process. The footplate of the stapes is extremely thin and of a bullate shape that bulges into the vestibule of the inner ear the collagenous fibers of the annular ligament, which hold it in place, are unusually fine ( Webster, 1961). The lenticular process of the incus articulates with the head of the stapes in an amphiplanar joint. The long process of the incus parallels the manubrium but is less than one-third of its length-a much greater difference than in most mammals. The incus and the malleus join in a complex double saddle-shaped synovial articulation that allows no relative motion between them. The malleus has a very short neck, a tenuous anterior process, and a large head its manubrium, embedded in the fibrous layer of the tympanic membrane, is unusually slender. The auditory ossicles are delicately suspended in the middle ear cavity. Webster, Molly Webster, in Contributions to Sensory Physiology, 1984 C Kangaroo Rat Auditory Ossicles and Intraaural Muscles
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