Bragulla H, Budras K D, Reilly J D
Department of Veterinary Anatomy, Faculty of Veterinary Medicine, Freie Universität Berlin, Germany.
Equine Vet J Suppl. 1998 Sep(26):22-6. doi: 10.1111/j.2042-3306.1998.tb05118.x.
The fetal development of the white line (Zona alba) in the equine hoof is described. Its specific structure of lamellar and interlamellar horn, which in turn is composed of cap and terminal horn, is formed in the second half of the hoof's fetal development. In equine fetuses with a crown-rump length of less than 550 mm, the hoof capsule lacks a 'characteristic' white line since no borders between stratum medium, stratum internum and sole horn are discernible. In the hoof of an equine fetus with a crown-rump length of 550 mm, a narrow white line has taken shape. Its shallow lamellae are arranged like arcades. Between the horn lamellae lie the polyhedral cells of the interlamellar horn. Up until birth, the height of the horn lamellae and, therefore, the width of the white line increases significantly. In the white line of the hoof of newborn foals, the terminal horn contains horn tubules with a characteristic architecture.
本文描述了马属动物蹄白线（白区）的胎儿发育情况。蹄白线的板层角和板层间角的特殊结构，依次由帽状角和终末角组成，是在蹄胎儿发育的后半期形成的。在头臀长度小于550毫米的马属动物胎儿中，蹄匣没有“特征性”白线，因为在中层、内层和蹄底角之间没有明显的边界。在头臀长度为550毫米的马属动物胎儿的蹄中，一条狭窄的白线已经形成。其浅板层排列成拱廊状。在角板层之间是板层间角的多面体细胞。直到出生，角板层的高度以及白线的宽度都显著增加。在新生马驹蹄的白线中，终末角包含具有特征性结构的角小管。
