internal acoustic meatus

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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 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.


(me-a'tus) plural.meatus [L.]
A passageway or an opening. meatal (me-a'tal), adjective

acoustic meatus

The opening to either the external or internal auditory canal. It can also be a synonym for either the external or internal auditory canal.

meatus acusticus externus

External auditory canal.

meatus acusticus internus

Internal auditory canal.

external acoustic meatus

External auditory meatus.

external auditory meatus

The outer opening of the external auditory canal, or the canal itself.
See: external acoustic meatus.

internal acoustic meatus

Internal auditory meatus.

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

meatus nasi communis

Common nasal cavity on either side of septum, into which three meatus open.

meatus nasi inferior

Space beneath inferior turbinate or concha of the nose.

meatus nasi medius

Space beneath middle turbinate or concha of the nose.

meatus nasi superior

Space beneath superior turbinate or concha of the nose.

meatus nasopharyngeus

Posterior portion of nasal cavity, which communicates with the nasopharynx.

urethral meatus

External opening of the urethra.
Synonym: urinary meatus; meatus urinarius

meatus urinarius

Urethral meatus.

urinary meatus

Urethral meatus.


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

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.
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