meatus /me·a·tus/ (me-a´tus) pl. mea´tus [L.] an opening or passage.mea´tal
acoustic meatus
acoustic meatus , auditory meatus either of two passages in the ear, one leading to the tympanic membrane (external acoustic m.), and one for passage of nerves and blood vessels (internal acoustic m.) . 
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nasal meatus one of the four portions (common, inferior, middle, and superior) of the nasal cavity on either side of the septum. 
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urinary meatus the opening of the urethra on the body surface through which urine is discharged.
| acoustic meatus n. 1. The passage leading inward through the tympanic portion of the temporal bone, from the auricle to the tympanic membrane; external acoustic meatus. 2. A canal running through the petrous portion of the temporal bone, giving passage to the facial and vestibulocochlear nerves and to the labyrinthine artery and veins; internal acoustic meatus. |
acoustic meatus
Etymology: Gk, akoustikos, hearing; L, meatus, a passage
the external or internal canal of the ear.
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