…When the pineal gland acts as a photoreceptor, the background effect does not occur. This organ is also an endocrine organ that produces and secretes melatonin, which has the effect of agglutinating granules in the melanophores. When the outside world is bright, the secretion of this hormone is suppressed, but in dark places it is secreted, causing the body color to lighten. … From [Endocrine Glands]...From a phylogenetic perspective, the original function of the testes and ovaries is to form sex cells, and the secretion of sex hormones is likely something that was acquired during evolution. (10) Pineal gland The pineal gland of mammals and birds secretes melatonin and has a glandular structure, so it is also called the pineal gland, but in reptiles, amphibians, and fish it is still a light sensory organ, not an endocrine gland, and is therefore called the pineal gland. It is said to not exist in hagfish. ... *Some of the terminology that mentions "melatonine" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…松果体が光受容体として働く場合には背地効果は生じない。この器官は黒色素胞内の顆粒を凝集させる作用をもつメラトニンmelatonineを産生,分泌する内分泌器官でもある。外界が明るいときは,このホルモンの分泌は抑制されているが,暗所では分泌されるので体色が明化する。… 【内分泌腺】より…系統発生学的に考えて,精巣,卵巣は性細胞を形成するのが元来の機能であり,性ホルモンの分泌機能は進化の途上獲得されたものであろう。(10)松果腺 哺乳類,鳥類の松果体はメラトニンmelatonineを分泌し,腺構造をもつので松果腺とも呼ばれるが,爬虫類,両生類,魚類ではまだ光感覚器官で内分泌腺ではなく,松果体と呼ぶ。メクラウナギ類では存在しないといわれる。… ※「melatonine」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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