Pinna (anatomy)
- Auricula or Pinna is of an ovoid form, with its larger end directed upward.
- lateral surface is irregularly concave, directed slightly forward, and presents numerous eminences and depressions to which names have been assigned
- prominent rim of the auricula is called the helix; where the helix turns downward behind, a small tubercle, the auricular tubercle of Darwin, is frequently seen
- another curved prominence, parallel with and in front of the helix, is called the antihelix
- this divides above into two crura, between which is a triangular depression, the fossa triangularis
- narrow-curved depression between the helix and the antihelix is called the scapha
- the antihelix describes a curve around a deep, capacious cavity, the concha, which is partially divided into two parts by the crus or commencement of the helix
- the upper part is termed the cymba conchæ
- the lower part the cavum conchæ
- in front of the concha, and projecting backward over the meatus, is a small pointed eminence, the tragus, so called from its being generally covered on its under surface with a tuft of hair, resembling a goat's beard.
- opposite the tragus, and separated from it by the intertragic notch, is a small tubercle, the antitragus
- below this is the lobule, composed of tough areolar and adipose tissues, and wanting the firmness and elasticity of the rest of the auricula
- the antihelix describes a curve around a deep, capacious cavity, the concha, which is partially divided into two parts by the crus or commencement of the helix
- cranial surface of the auricula presents elevations which correspond to the depressions on its lateral surface and after which they are named, e. g., eminentia conchæ, eminentia triangularis, etc.
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