Ossicles(redirected from Tympanic ossicle)
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auditory ossiclesThe 3 diminutive bones of the middle ear. The malleus is attached to the inner face of the tympanic membrane at the manubrium and articulates at its head with the body of the incus; the incus in turn articulates at its lenticular process with the head of the stapes; the stapes is attached at its base by a ligamentous ring to the oval window of the vestibule. Sound waves channelled though the external acoustic canal (auditory duct) to the tympanic membrane are amplified by the auditory ossicles.
The vibrations received at the oval window are passed down the cochlea; the relative movement of the basilar and tectorial membranes leads to deflection of the stereocilia of the hair cells in the organ of Corti, which generates an influx of K+ ions and production of electrical signals that travel via the cochlear nerve to the auditory complex.
The three small bones of the middle ear: the malleus (hammer), the incus (anvil) and the stapes (stirrup). These bones help carry sound from the eardrum to the inner ear.
ossiclesaccessory bones (see Table 1); accessory ossicles are subject to the same range of trauma or pathologies as constant (skeletal) bones
|Accessory bone in the foot||Location|
|Os tibiale externum (accessory navicular)||Within tibialis posterior tendon, adjacent to proximal part of navicular tuberosity|
|Os trigonum||Posterior margin of talus|
|Os peroneum||Within peroneus longus tendon, adjacent to inferior lateral border of cuboid/calcaneocuboid joint|
|Os vesalianum||Adjacent to fifth metatarsal base|
|Os intermetatarseum||Between bases of first and second metatarsals|
|Os interphalangeus||Within insertion of flexor hallucis longus tendon, adjacent to plantar area of hallux interphalangeal joint|