东方铃蟾消化道组织学的初步研究

Histology Study on Digestive Tract of Bombina orientalis

采用组织学方法对东方铃蟾的消化道进行了研究。结果表明:肠分为十二指肠、空肠和大肠。消化道管壁由粘膜层、粘膜下层、肌层和浆膜层构成。食道、胃和肠均为单层柱状上皮。胃和十二指肠的粘膜皱褶最丰富。食道腺为复泡状腺,胃腺属于单管状腺,肠的各段无多细胞腺体,但空肠和大肠有丰富的杯状细胞。肌层均为平滑肌,内层环肌较厚,外侧纵肌较薄,其中大肠的外侧纵肌最发达。

The tissue and cell in digestive tract of Bombina orientalis were studied by histological method. The results show that the intestine ofBombina orientalis consists of duodenum, jejunum and large intestine. The wall of digestive tract is made up of four layers, which are the mucosa, tunica submucosa, muscularis and serosa. Simple columnar epithelium belongs to every part of oesophagus, stomach and intestine. There are more plenty of rugae in cavity of stomach and duodenum than other digestive tract. Oesophagel gland and gastric gland belong to compound acinar gland and simple tubular gland respectively. All segments of the intestine do not have multicellular gland, but the jejunum and large intestine have plenteous goblet ceils. The muscular layer is constructed by smooth muscle with inside circular fibers more abundant than outside longitudinal ones. Among all of the digestive tractst, the large intestine has the most abundant longitudinal muscle.