internal acoustic meatus

internal acoustic meatus,

an opening in the petrous portion of the temporal bone through which the facial, intermediate, and vestibulocochlear nerves and the labyrinthine artery pass. Also called meatus acusticus internus.

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meatus

pl. meatus [L.] an opening or passage.

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acoustic meatus, meatus acusticus, meatus auditorius, auditory meatus

a passage in the ear; see external acoustic meatus and internal acoustic meatus (below).

ethmoidal meatus

the spaces between the ethmoturbinal bones.

external acoustic meatus

the passageway within the ear between the ear flap and the eardrum.

internal acoustic meatus

the passageway on the medial surface of the petrous temporal bone; transmits the facial and vestibulocochlear nerves.

meatus nasi, meatus of nose

one of the three main airways of the nasal cavity which are found on either side of the septum; they are the dorsal, middle and ventral meati.

nasopharyngeal meatus

the common space shared by the right and left nasal cavities just before they enter the nasopharynx.

meatus urinarius, urinary meatus

the opening of the urethra on the body surface through which urine is discharged.