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What is a concha?

What is a concha? Here are some definitions.

Noun
  1. Any shell-shaped structure.
  2. (anatomy) The deepest indentation of the cartilage of the human ear, attaching to the mastoid bone.
  3. (architecture) An apse, or the plain semidome of an apse.
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Examples
The points are found, explains Sara, by imagining a baby in an inverted foetal position, with the earlobe representing the head, the concha the internal organs and so on.
The skin of the cartilaginous canal is affected initially, with more severe disease affecting the concha, bony canal and tympanic membrane.
From the roof, the olfactory epithelium extends down both sides of the nasal cavity to cover most of the superior concha laterally and 1 cm of nasal septum medially.
The deepest depression, which leads directly to the external auditory canal, or acoustic meatus, is called the concha.
They are inserted into the lower part of the cranial surface of the concha.
If the concha clip is visibly sticking out from your ear, it has not been positioned correctly.

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