acoustic meatus


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Related to acoustic meatus: auditory meatus

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.

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.

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.

acoustic meatus

Etymology: Gk, akoustikos, hearing; L, meatus, a passage
the external or internal canal of the ear.

acoustic meatus

(1) External acoustic meatus, meatus acusticus externus; external auditory canal.
(2) Internal acoustic meatus, meatus acusticus internus; internal auditory canal.

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.

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) .
References in periodicals archive ?
Erosion and widening of internal acoustic meatus in acoustic neuroma are found in 75% cases.
The internal acoustic meatus (IAM) is a short bony canal that lies between the posterior surface of the petrous pyramid and the bony labyrinth within the dense petrous bone (Standring, 2005); the IAM opens medially to the posterior canal fossa through the porus acusticus.
Magnetic resonance imaging (MRI) detected an 8-mm enhancing nodule in the right acoustic meatus (figure 1).
INTRODUCTION: Congenital cholesteatoma arises from the embryonic epidermal crest, is a benign Disease with slow progressive growth that destroys neighboring structures, it is considered an epidermal cyst originating from the remnants of squamous keratinized epithelium, the disease may appear in several regions of the temporal bone such as in the middle ear (most frequent site) as well as in the petrous apex, cerebellopontine angle, external acoustic meatus and mastoid process, congenital cholesteatoma of the mastoid process is the rarest form of presentation in the temporal bone, only 2 to 4% of cholesteatoma presenting to pediatric otologist are congenital in origin.
This dressing is not appropriate for large wounds or for wounds that are located in the concha auricularis or the external acoustic meatus.

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