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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Mammary crest ： ウィキペディア英語版 Mammary crest The mammary crest is a primordium specific for the mammary gland on the breast and is often associated with mammary gland development and breast development. ==Development== The mammary crest usually appears as a narrow, microscopic ectodermal thickening during the first 7 weeks of pregnancy and grows caudally as a narrow, linear crest.〔 Mammary lines begin to shorten and ectodermal cells begin to divide and grow into the mesenchymal cell layer.〔(【引用サイトリンク】title=Mammary Development - Fetal )〕 A basement membrane separating the expanding ectodermal crest structure and the underlying mesoderm usually remains. The mammary crest then becomes recognizable in the thoracic region in the human embryo. A mammary crest usually stops growing at 8 weeks and its length is regressed starting at the caudal end and extending cranially,〔 so that what remains is a round, ectodermic placode where the axilla develops. When shortening of the mammary crest is complete, the structure remains prominent in the areas where the mammary glands eventually form. 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「Mammary crest」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.