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A supernumerary nipple (also known as a third nipple, triple nipple, accessory nipple, polythelia or the related condition: polymastia) is an additional nipple occurring in mammals, including humans. Often mistaken for moles, supernumerary nipples are diagnosed in humans at a rate of approximately 1 in 3 males and 1 in 17 females〔〔("Cancer hope over breast gene find" ), BBC, 1 September 2005; references the rate of extra nipples appearing in humans.〕 The nipples appear along the two vertical "milk lines," which start in the armpit on each side, run down through the typical nipples and end at the groin. They are classified into eight levels of completeness from a simple patch of hair to a milk-bearing breast in miniature.〔Kajava Y. "The proportions of supernumerary nipples in the Finnish population". ''Duodecim'' 1915; 1:143-70.〕 ''Polythelia'' refers to the presence of an additional nipple alone while ''polymastia'' denotes the much rarer presence of additional mammary glands. Although usually presenting on the milk line, pseudomamma can appear as far away as the foot.〔(【引用サイトリンク】title=Pseudomamma on the foot: An unusual presentation of supernumerary breast tissue )〕 A possible relationship with mitral valve prolapse has been proposed. ==Society and culture== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「supernumerary nipple」の詳細全文を読む スポンサード リンク
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