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meatus
In anatomy, a meatus ,〔>''OED'' 2nd edition, 1989, as .〕 plural "meatus" or "meatuses",〔>(Entry "meatus" in Merriam-Webster Online Dictionary ).〕 is a natural body opening or canal.
Examples include:
* the external acoustic meatus, the opening of the ear canal
* The internal auditory meatus, a canal in the temporal bone of the skull
* the urinary meatus, which is the opening of the urethra, situated on the glans penis in males, and in the vulva in females
* the superior meatus, middle meatus and inferior meatus of the nose
(The plural forms of "meatus" are: ''meatus'', as a Latin form (of the fourth declension noun class, which the word belongs to); or ''meatuses'', as a normally derived English plural; or often, and incorrectly, ''meati'', by false analogy with the very common Latin ''-us/-i'' forms (such as ''alumnus/alumni''), i.e., the second declension noun class.)
==See also==
* Meatal stenosis
* Fossa (anatomy)
* Foramen (disambiguation)
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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