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 [kong´kah] (pl. con´chae) (L.)
a shell-shaped structure.
concha of auricle the hollow of the auricle of the external ear, bounded anteriorly by the tragus and posteriorly by the antihelix.
inferior nasal concha a bone forming the lower part of the lateral wall of the nasal cavity.
middle nasal concha the lower of two bony plates projecting from the inner wall of the ethmoidal labyrinth and separating the superior from the middle meatus of the nose.
sphenoidal concha a thin curved plate of bone at the anterior and lower part of the body of the sphenoid bone, on either side, forming part of the roof of the nasal cavity.
superior nasal concha the upper of two bony plates projecting from the inner wall of the ethmoidal labyrinth and forming the upper boundary of the superior meatus of the nose.
supreme nasal concha a third thin bony plate occasionally found projecting from the inner wall of the ethmoidal labyrinth, above the two usually found.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


(kong'ka) plural.conchae [Gr. konche, shell]
1. The outer ear or the pinna.
2. One of the three nasal conchae. See: nasal concha

concha auriculae

A concavity on the median surface of the auricle of the ear, divided by a ridge into the upper cymba conchae and a lower cavum conchae. The latter leads to the external auditory meatus.

concha bullosa

A distention of the turbinate bone due to cyst formation.

nasal concha

One of the three scroll-like bones that project medially from the lateral wall of the nasal cavity; a turbinate bone. The superior and middle conchae are processes of the lateral mass of the ethmoid bone; the inferior concha is a facial bone. Each overlies a meatus.

concha sphenoidalis

In a fetal skull, one of the two curved plates located on the anterior portion of the body of the sphenoid bone and forming part of the roof of the nasal cavity.
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
If the conchae volume and the nasal temperature are lower, the water loss is lesser.
Due to lack of a significant difference between the conchae volumes and volume fractions of stork and seagull, we inferred that there will be less amount of plexus in stork's conchae than in seagull's conchae.
For better understanding of water preservation in migratory birds, more detailed studies about the conchae venous plexus density and the morphologic structure of the conchae epithelium are required.
The present study was designed to investigate the distribution of nerves in the human cavum conchae and MAEC in order to provide a detailed map that may allow the design of devices for auricular transcutaneous nerve stimulation.
This study reports the relative density of nerves in human cavum conchae and MAEC, demonstrating that it is higher in MAEC than in the cavum conchae and in the superior and posterior MAEC walls than in the anterior one.
In particular, the ABVN is especially important for the innervation of the cymba conchae [27] and the posterior wall of MAEC [24].
[27] have observed in humans that transcutaneous stimulation of the cymba conchae, that is, ABVN, produces activation of the classical centers of vagal projections (increased ipsilateral activity in NTS and bilateral activity of spinal nuclei of the trigeminal nerve, the dorsal raphe nucleus, locus coeruleus, contra-lateral parabrachial area, amygdala, and nucleus accumbens, as well as bilateral activation of the paracentral lobe).
In our study, a variable percentage of MBP+ nerve fibers were observed in both the cavum conchae and MAEC, whose density paralleled that of the nerve profiles.
Caption: FIGURE 1: (a) Section of the cavum conchae stained with Masson's trichrome staining.
Caption: FIGURE 2: Masson's trichome staining (a) and immunostaining for neurofilaments ((b), (d), and (e)) and S100 protein (c) in sections of the cavum conchae, showing nerve profiles inside (c) and out of ((b), (d), and (e)) the auricular cartilage.