Vulva - the gland

…They are distributed over almost all of the skin of the body, attached to hair, and secrete a fat-like substance (sebum) containing fatty acids and cholesterol to moisturize the hair and skin and prevent dryness. They are not found in hairless areas, such as the palms of the hands or the soles of the feet, but they do form independent sebaceous glands that are not associated with hair, such as the lips, foreskin, vulva, and anal glands (called labial glands, preputial glands, vulvar glands, and anal glands, respectively). The glands are located in the dermis, are alveolar in shape, and are grouped together to surround the hair follicles. …

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

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…毛に付随してほとんど全身の皮膚に分布し，脂肪酸やコレステロールなどを含む脂肪様の物質(皮脂)を分泌し，毛や皮膚をうるおし，乾燥をふせいでいる。毛のない部位，例えば手のひらや足のうらにはないが，口唇，包皮，外陰，肛囲などでは毛をともなわない独立皮脂腺をつくっている(それぞれ口唇腺，包皮腺，外陰腺，肛門腺と呼ばれる)。腺体は真皮中にあり，形は胞状で，毛包(毛囊)を囲み，数個集まっている。…

※「外陰腺」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