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lanugo
Lanugo (;〔("lanugo" ). ''Random House Webster's Unabridged Dictionary''.〕 from Latin ''lana'' "wool") is very fine, soft, and usually unpigmented, downy hair as can be found on the body of a fetus or newborn baby. It is the first hair to be produced by the fetal hair follicles, and it usually appears on the fetus at about five months of gestation. It is normally shed before birth, around seven or eight months of gestation but is sometimes present at birth and disappears on its own within a few days or weeks.〔(【引用サイトリンク】url=http://www.medterms.com/script/main/art.asp?articlekey=6210 )〕
It is replaced by hair covering the same surfaces called vellus hair, but this hair is finer and more difficult to see. The more visible hair that continues into adulthood is called terminal hair. This forms in specific areas and is hormone dependent.
==Occurrence==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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