internal auditory meatus

(redirected from Porus acusticus internus)
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in·ter·nal a·cous·tic me·a·tus

a canal beginning at the opening of the internal acoustic meatus in the posterior cranial fossa, passing laterally through the petrous portion of the temporal bone to end at the fundus, where a thin plate of bone separates it from the vestibule; it gives passage to the facial and vestibulocochlear nerves together with the labyrinthine artery and veins.

internal auditory meatus

The opening of the internal auditory canal into the cranial cavity located on the posterior surface of the petrous portion of the temporal bone, or the canal itself.
Synonym: internal acoustic meatus
See also: meatus


pertaining to the ear or the sense of hearing.

auditory apparatus
comprises the tympanic membrane, the auditory ossicles that connect the membrane to the oval window to the internal ear, the membranous labyrinth and its contained endolymph, the labyrinth's cochlear duct, the organ of Corti, a specialized sensory epithelium lining the duct, the sensory hair cells of the organ of Corti and the sensory receptors of the auditory nerve that terminate at the base of the hair cells.
auditory bulb
the membranous labyrinth and cochlea.
auditory conditioning signals
sounds used to condition animals to certain procedures or events, such as gathering at the sound of a bell or trumpet, milking to the sound of a radio, whistle signals to a sheep dog.
external auditory meatus
air-filled tubular extension of the auricle leading to the eardrum.
internal auditory meatus
a canal in the petrous temporal bone that accommodates the VIIth and VIIIth cranial nerves.
auditory nerve
the eighth cranial nerve; called also vestibulocochlear nerve and acoustic nerve. See Table 14.
auditory ossicles
the malleus, incus and stapes, the three small bones of the tympanic cavity of the ear. They form a connecting bony system from the tympanic membrane to the oval window that is the opening to the internal ear.
auditory tube
the narrow channel connecting the nasopharynx to the middle ear. See also pharyngotympanic tube.