An opening or passageway. For example, the female urethral meatus. The urethra is the transport tube from the bladder to the outside of the body. In females the urethra is shorter than in the male. The meatus of the female urethra is just above the vaginal opening, as shown here
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A passage or channel, especially the external opening of a canal. SYN: external opening. [L. a going, a passage, fr. meo, pp. m., to go, pass]
- acoustic m. SYN: external acoustic m..
- m. acusticus externus [TA] SYN: external acoustic m..
- m. acusticus internus [TA] SYN: internal acoustic m..
- external acoustic m. [TA] the passage leading inward through the tympanic portion of the temporal bone, from the auricle to the tympanic membrane; it consists of a bony (inner) portion and a fibrocartilaginous (outer) portion, the cartilaginous external acoustic m.. SYN: m. acusticus externus [TA], acoustic m., antrum auris, auditory canal, ear canal, external auditory m..
- fish-mouth m. a red and swollen condition of the orifice of the urethra (urinary m.) in gonorrhea.
- internal acoustic m. [TA] a canal beginning at the opening of the internal acoustic m. 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. SYN: m. acusticus internus [TA], internal auditory m..
- nasal m. [TA] any of four passages in the nasal cavity formed by the projection of the conchae: inferior nasal m. [TA] (m. nasi inferior [TA]), lies below the inferior concha; middle nasal m. [TA] (m. nasi medius [TA]), lies between the middle and inferior conchae; superior nasal m. [TA] (m. nasi superior [TA]), lies between the superior and middle conchae; common nasal m. [TA] (m. nasi communis [TA]) is the part of the nasal cavity between the conchae and the nasal septum. SYN: m. nasi [TA].
- m. nasi [TA] SYN: nasal m..
- nasopharyngeal m. [TA] the posterior part of the nasal cavity from the posterior limits of the conchae to the choanae. SYN: m. nasopharyngeus [TA], nasopharyngeal passage.
- m. nasopharyngeus [TA] SYN: nasopharyngeal m..
- ureteral m. SYN: ureteric orifice.
- m. urinarius SYN: external urethral orifice.

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me·atus mē-'āt-əs n, pl me·atus·es -ə-səz or me·atus -'āt-əs, -'ā-.tüs a natural body passage: CANAL, DUCT

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(in anatomy) a passage or opening. The auditory meatus is the passage leading from the pinna of the outer ear to the eardrum. A nasal meatus is one of three groovelike parts of the nasal cavity beneath each of the nasal conchae. The urethral meatus is the external opening of the urethra.

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me·a·tus (me-aґtəs) pl. meaґtus [L., “a way, path, course”] a passageway in the body, especially one opening on the surface. meatal adj

Medical dictionary. 2011.

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Look at other dictionaries:

  • Meatus — Me*a tus, n. sing. & pl.; E. pl. {Meatuses}. [L., a going, passage, fr. meare to go.] (Anat.) A natural passage or canal; as, the external auditory meatus. See Illust. of {Ear}. [1913 Webster] …   The Collaborative International Dictionary of English

  • Meatus —   [lateinisch »Gang«, »Weg«] der, / , Anatomie: Ausführungsgang, Verbindungsgang. Meatus acụsticus, Gehörgang …   Universal-Lexikon

  • meatus — [mē āt′əs] n. pl. meatuses or meatus [LL, avenue of sensation in the body < L, a passage, pp. of meare, to go, pass < IE base * mei , to go] a ductlike passage within the body or the external opening of such a passage, as in the ear, nose,… …   English World dictionary

  • Meātus — (lat., Anat.), ein Gang, s. Kanal 6); M. auditorĭus, s.u. Ohr; M. narĭum, s.u. Nase 2) …   Pierer's Universal-Lexikon

  • Meatus — In anatomy, a meatus is a natural body opening or canal (Latin, 4th declension pl. meatus, or meatuses often incorrectly meati). Examples include: the external acoustic meatus, the opening of the ear canal The internal auditory meatus, a canal in …   Wikipedia

  • meatus — n. (in anatomy) a passage or opening. The auditory meatus is the passage leading from the pinna of the outer ear to the eardrum. A nasal meatus is one of three groovelike parts of the nasal cavity beneath each of the nasal conchae. The urethral… …   The new mediacal dictionary

  • meatus — meatal, adj. /mee ay teuhs/, n., pl. meatuses, meatus. Anat. an opening or foramen, esp. in a bone or bony structure, as the opening of the ear or nose. [1655 65; < L meatus course, channel, equiv. to mea(re) to go, extend, have a course + tus… …   Universalium

  • meatus — noun (plural meatuses or meatus) Etymology: Late Latin, from Latin, going, passage, from meare to go more at permeate Date: 1580 a natural body passage …   New Collegiate Dictionary

  • Meatus — Mea̱|tus [aus lat. meatus = Gang, Weg] m; , [...á̱tu̱ß]: Verbindungsgang, Ausführungsgang, Körperkanal (Anat.). Mea̱|tus acụsticus ex|tẹrnus: “äußerer Gehörgang“, kurzer, knöcherner Gang des Schläfenbeins, der vom Trommelfell zur Ohrmuschel… …   Das Wörterbuch medizinischer Fachausdrücke

  • Meatus — Me|a|tus der; , [...tu:s] <aus lat. meatus »Gang, Weg«> Verbindungsgang, Ausführungsgang, Körperkanal (Med.) …   Das große Fremdwörterbuch

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