… The third important property of the epidermis is its ability to synthesize melanin. Melanin-producing cells (melanocytes) make up only about 5-10% of the epithelial cells that make up the basal layer of the epidermis, but they remain scattered within the basal layer and provide melanin to the surrounding epithelial cells that are destined to become keratinized. Depending on the amount of melanin produced, the color of the skin and hair can vary from black to yellow to white. … From [Melanin]…Melanin is soluble in alkali and warm concentrated sulfuric acid, but not in water. Melanin is produced in melanosomes, specialized structures formed in the cytoplasm of melanophores (often called melanocytes in warm-blooded animals and melanophores in cold-blooded animals) that are differentiated from melanoblasts. This process has been studied in detail. … *Some of the terminology that mentions "melanocyte" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… 表皮の3番目の重要な性質として,メラニンの合成能を有する点があげられる。メラニン産生細胞(メラノサイトmelanocyte)は,表皮の最基底層をなす上皮細胞のうちの5~10%程度を占めるにすぎないが,最基底層内に散在し続けて周囲の角質化の運命をたどる上皮細胞群にメラニンをあたえる。その量の多少により皮膚や毛の色調が黒~黄~白と変化する。… 【メラニン】より…メラニンはアルカリや温濃硫酸には溶けるが,水には溶けない。メラニンの生成は黒色素芽細胞が分化した黒色素胞(定温動物ではメラノサイトmelanocyte,変温動物ではメラノフォアmelanophoreと呼ばれることが多い)の細胞質内に形成される特殊な構造であるメラノソームmelanosome中で行われる。この過程は詳しく研究されている。… ※「melanocyte」について言及している用語解説の一部を掲載しています。 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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