meatus

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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.

me·a·tus

, pl.

me·a·tus

(mē-ā'tŭs), [TA]
A passage or channel, especially the external opening of a canal.
Synonym(s): external opening
[L. a going, a passage, fr. meo, pp. meatus, to go, pass]

meatus

/me·a·tus/ (me-a´tus) pl. mea´tus   [L.] an opening or passage.mea´tal
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.) .
nasal meatus  one of the four portions (common, inferior, middle, and superior) of the nasal cavity on either side of the septum.
urinary meatus  the opening of the urethra on the body surface through which urine is discharged.

meatus

(mē-ā′təs)
n. pl. mea·tuses or meatus
A body opening or passage, such as the opening of the ear or the urethral canal.

me·a′tal (-təl) adj.

meatus

[mē·ā′təs] pl. meatuses
Etymology: L, channel
an opening or tunnel through any part of the body, such as the external acoustic meatus that leads from the external ear to the tympanic membrane.

meatus

A natural opening of a tubular lumen, which in the usual working medical parlance refers to the urinary meatus located in the glans penis or in the vulva. Other meatuses include the external and internal auditory meatuses, and the superior, middle and inferior meatus of the nose.

me·a·tus

, pl. meatus (mē-ā'tŭs) [TA]
A passage or channel, especially the external opening of a canal.

meatus

Any passage or opening in the body.

meatus

any natural opening or passage, particularly the external auditory meatus leading to the TYMPANUM in the ear.

meatus (mēˑ·ts),

n a natural channel or opening within the body.

me·a·tus

, pl. meatus (mē-ā'tŭs) [TA]
Passage, especially external opening of a canal.

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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In animals drinking the spiked water, for instance, the external opening of the vagina developed early, cells lining the vagina were bigger than normal and exhibited protein changes akin to those that produce nails and corns, and the uterus weighed significantly more than normal.