The laminar layer was layer-shape structure and was comprised of reticulae fibre and irregular electron-dense granular,but the structure was dense in Tibetan sheep original sample and was scatter in yak origin-al sample near germinal membrane.

• 角质层由纤维物质和不规则形颗粒形成层状结构，但近生发膜处藏羊源的结构致密，牦牛源的则较为疏松。