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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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
meatus(me-a'tus) plural.meatus [L.]
A passageway or an opening. meatal (me-a'tal), adjective
The opening to either the external or internal auditory canal. It can also be a synonym for either the external or internal auditory canal.
meatus acusticus externusExternal auditory canal.
meatus acusticus internusInternal auditory canal.
external acoustic meatusExternal auditory meatus.
external auditory meatus
The outer opening of the external auditory canal, or the canal itself.See: external acoustic meatus.
internal acoustic meatusInternal auditory meatus.
internal auditory meatus
The opening of the internal auditory canal into the cranial cavity located on the posterior surface of the petrous portion of the temporal bone, or the canal itself.Synonym: internal acoustic meatus
meatus nasi communis
Common nasal cavity on either side of septum, into which three meatus open.
meatus nasi inferior
Space beneath inferior turbinate or concha of the nose.
meatus nasi medius
Space beneath middle turbinate or concha of the nose.
meatus nasi superior
Space beneath superior turbinate or concha of the nose.
Posterior portion of nasal cavity, which communicates with the nasopharynx.
External opening of the urethra.Synonym: urinary meatus; meatus urinarius
meatus urinariusUrethral meatus.
urinary meatusUrethral meatus.
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