meatus /me·a·tus/ (me-a´tus) pl. mea´tus [L.] an opening or passage.mea´tal
meatus
meatus [me-a´tus] (pl. mea´tus) (L.)
meatus (mēˑ·t
s),
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.
me·a·tus (m -  t s)n. pl. me·a·tus·es or meatus A body opening or passage, especially the external opening of a canal. |
meatus
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 [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.
meatus (mēˑ·t
s),n a natural channel or opening within the body.
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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