大凉疣螈皮肤的组织学观察

Histological Observation on Skin of Tylototriton taliangensis

对大凉疣螈Tylototriton taliangensis的皮肤进行了显微观察,结果表明,其体表不同部位皮肤的厚度存在一定差异,但基本结构相同。皮肤表面粗糙,表皮角质化程度较高。表皮与真皮相接处毛细血管丰富,毛细血管常向表皮突起,突起处表皮细胞层数减少,背部毛细血管密度大于腹部。皮肤中含有丰富的色素细胞,主要分布在真皮疏松层浅表。真皮中有丰富的皮肤腺:粘液腺体积较小,分布遍及全身,腹侧密度较大;颗粒腺体积较粘液腺大,主要分布在耳区、体背两侧及尾背侧,形成耳后腺、背嵴、尾部颗粒腺区等特殊结构。

The microstructure of the skin of the salamander Tylototriton taliangensis was observed. The results were as fol- lows ： the skin at different parts of the body differed in thickness, but remained similar in the basic structure. The surface of the skin was rough, and its epidermis was keratinized to a relatively high degree. Capillary vessels were abundant in the junction of the dermis and the epidermis, and more abundant in the dorsal skiin than ventrally. Capillary vessels in the dermis fi＇equently caused a protuberance of the dermis where cellular layers in the epidermis were less than other parts. The skin was rich in pigment cells that were found mainly in the loose layer of the dermis. There were two kinds of glands present, namely mucous glands and granular glands. Mucous glands were small and found throughout the skin of the body, but were most abundant in the ventral skin. Typical granular glands were larger than mucous glands. Granular glands, which were mainly located in the ear area, backside of body, and tail, were grouped to form special granular zones in corresponding areas of the skin.