Apocrine secretion

Japanese: apocrine secretion（英語表記）apocrinesecretion

…A type of gland that performs secretory function. In glandular cells, the way secretions are released outside the cell body includes total secretion, exocrine secretion, and exocrine secretion. Exocrine secretion is also called apocrine secretion, and glands formed from a group of cells that cause apocrine secretion are called apocrine glands. Exocrine secretion is when large cytoplasmic projections form on the cell surface, their bases become constricted and cut off, and secretions are produced. …

From [Gland]

…
[Mechanism of secretion]
(1) Holocrine secretion: The secretion fills the cytoplasm, the nucleus shrinks, and finally the entire cell dies, becoming a secretion that is excreted. This is seen in sebaceous glands and tarsal glands. (2) Apocrine secretion: The secretion formed in the glandular cell gathers on the free surface of the cell and protrudes (these protrusions are called apocrine processes), eventually causing the base of the process to narrow and break off, falling into the glandular cavity. This is seen in the apocrine sweat glands of the armpits, ear canal glands, and mammary glands.

*Some of the terminology that mentions "apocrine secretion" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…分泌機能をいとなむ腺の一種。腺細胞において，分泌物が細胞体外へ放出される方法には，全分泌，離出分泌，開口分泌などがあるが，離出分泌はアポクリン分泌apocrine secretionともいい，アポクリン分泌を起こす細胞群からできた腺をアポクリン腺という。離出分泌とは，細胞表面に大きい細胞質の突起ができて，その根元がくびれて離断し，分泌物になるものである。…

【腺】より

…
［分泌物が放出されるしくみ］
　(1)全分泌holocrine secretion　分泌物が細胞質内に充満し，核は萎縮し，ついには細胞全体が死滅し，分泌物と化して，排出されるものをいい，皮脂腺や瞼板腺においてみられる。(2)離出分泌apocrine secretion　腺細胞の中で形成された分泌物が，細胞の遊離面に集まって突出し(この突起をアポクリン突起という)，ついには突起の根元がくびれて離断し，腺腔におちこむものをいう。腋窩（えきか）のアポクリン汗腺，耳道腺，乳腺などでみられる。…

※「apocrine secretion」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

<<: Apocynaceae

>>: Apochromat