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.
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).
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.
ex·ter·nal a·cous·tic me·a·tus
[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 meatus.
Farlex Partner Medical Dictionary © Farlex 2012
acoustic meatus
n.1. The external portion of the auditory canal; external auditory canal.
2. The internal portion of the auditory canal; internal auditory canal.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
acoustic meatus
(1) External acoustic meatus, meatus acusticus externus; external auditory canal.
(2) Internal acoustic meatus, meatus acusticus internus; internal auditory canal.Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
a·cou·stic me·a·tus
(ă-kūs'tik mē-ā'tŭs) 1. External: auditory canal; the passage leading inward through the tympanic portion of the temporal bone, from the auricle to the membrana tympani;
2. Internal: a canal running through the petrous portion of the temporal bone, giving passage to the facial and vestibulocochlear nerves and to the labyrinthine artery and veins.
Synonym(s):
meatus acusticus.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
ex·ter·nal a·cous·tic me·a·tus
(eks-tĕr'năl ă-kūs'tik mē-ā'tŭs) [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 meatus.
Synonym(s):
acoustic meatus (1) ,
antrum auris.
ex·ter·nal au·di·to·ry ca·nal
(eks-tĕrnăl awdi-tōr-ē kă-nal) The passage leading inward through the tympanic portion of the temporal bone, from the auricle to the tympanic membrane; it consists of fibrocartilaginous outer and bony inner portions lined with thin skin medially and thicker skin with ceruminous glands, hair follicles, and subcutaneous fat laterally.
Synonym(s):
acoustic meatus (2) .
Medical Dictionary for the Dental Professions © Farlex 2012