|1.||a. the upper chamber of the heart; atrium|
|b. a small sac in the atrium of the heart|
|2.||anatomy Also called: pinna the external part of the ear|
|3.||biology Also called: auricula an ear-shaped part or appendage, such as that occurring at the join of the leaf blade and the leaf sheath in some grasses|
|[C17: from Latin auricula the external ear, from auris ear]|
auricle au·ri·cle (ôr'ĭ-kəl)
The projecting shell-like structure on the side of the head constituting, with the external acoustic meatus, the external ear. Also called pinna.
|auricle (ôr'ĭ-kəl) Pronunciation Key
in human anatomy, the visible portion of the external ear, and the point of difference between the human ear and that of other mammals. The auricle in humans is almost rudimentary and generally immobile and lies close to the side of the head. It is composed of a thin plate of yellow fibrocartilage covered by a tight-fitting skin. The external ear cartilage is molded into shape and has well-defined hollows, furrows, and ridges that form an irregular shallow funnel. The deepest depression in the auricle, called the concha, leads to the external auditory canal or meatus. The one portion of the auricle that has no cartilage is the lobule-the fleshy lower part of the auricle. The auricle has several small basic muscles that connect it to the skull and scalp. Generally nonfunctional in human beings, they are capable of limited movement in some people
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