The front, upper and rear edges of the pinna are mostly curled inwards to some extent, and are called the helix. A blunt protrusion sometimes seen on the curled-up edge of the rear upper part of the pinna is called Darwin's tubercle, or tuberculum auriculae, and is considered to be a small malformation. In rare cases, there is a malformation called the Macacus ear, in which this tubercle protrudes like a shell. In monkeys, the free edge of the pinna is not curled inwards and has a pointed tip. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
耳介の前,上,後縁にわたり大部分の輪郭の縁は,多少内方にまきこんでおり,耳輪と呼ばれる。耳輪の後上部のまきこんだ縁にときにみられるにぶい突起をダーウィン結節,あるいは耳介結節tuberculum auriculaeといい,小さな奇形と考えられている。まれには,この結節が貝殻状に突出しているマカクス耳Macacus earと呼ばれる奇形がある。サルの類では,耳介の遊離縁にはまきこみがなく,先端がとがっている。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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