meatus /me·a·tus/ (me-a´tus) pl. mea´tus [L.] an opening or passage.mea´tal
acoustic meatus
meatus [me-a´tus] (pl. mea´tus) (L.)
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.
meatus [me-a´tus] (pl. mea´tus) (L.)
an opening or passage, especially one leading to the body surface. adj., adj mea´tal.
acoustic meatus (meatus acus´ticus) either of two passages in the ear; the external acoustic meatus leads from the auricle to the tympanic membrane (eardrum) and the internal acoustic meatus is for passage of nerves and blood vessels.
auditory meatus acoustic meatus.
meatus na´si (meatus of nose) one of the three portions of the nasal cavity on either side of the septum: inferior (meatus nasi inferior), middle (meatus nasi medius), and superior (meatus nasi superior).
ureteral meatus ureteral orifice.
meatus urina´rius (urinary meatus) the opening of the urethra on the body surface, through which urine is discharged.
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