Akester A R
Sub-Department of Veterinary Anatomy, University of Cambridge.
J Anat. 1986 Aug;147:1-25.
The koilin membrane is formed by the secretions of gland, crypt and surface epithelial cells. Glands form a continuous layer and are arranged in groups of 10-20. They are straight tubes about 500 microns long and 15 microns in diameter and produce rodlets of hard koilin. Hard koilin rodlets (5 microns diameter) form clusters of five or six as they pass through the crypts and enter the koilin membrane. Each rodlet hardens within its gland and maintains its individuality throughout its entire length. Rodlet clusters have previously been called 'rods'. Most of the softer koilin, which fills the spaces between the rodlet clusters, is produced by the surface epithelial cells. These cells form gentle arches between the cavities of adjacent crypts. Horizontal branches between rodlet clusters ('rods') do not exist. There is approximately twice as much surface koilin as rodlet koilin within the membrane. Abrasion of the koilin membrane is not uniform but occurs in a patchy fashion.
角质膜由腺体、隐窝和表面上皮细胞的分泌物形成。腺体形成连续的一层，以10 - 20个为一组排列。它们是长约500微米、直径15微米的直管，产生坚硬角质的小杆状体。直径5微米的坚硬角质小杆状体在穿过隐窝并进入角质膜时形成五六个一组的簇。每个小杆状体在其腺体内硬化，并在其整个长度上保持其个体性。小杆状体簇以前被称为“杆”。填充在小杆状体簇之间空间的大部分较软的角质是由表面上皮细胞产生的。这些细胞在相邻隐窝的腔之间形成平缓的拱形。小杆状体簇（“杆”）之间不存在水平分支。膜内表面角质大约是小杆状体角质的两倍。角质膜的磨损并不均匀，而是呈斑片状发生。
