许氏平鲉消化道形态学和组织学的初步研究

许氏平鲉Sebastes schlegeli (Hilgendorf)消化 道短，具有肉食性鱼类的典型特征。 可分为口咽腔、食道、胃、小肠、直肠和肛门。口咽 腔上皮为复层上皮，上皮内有味蕾分布。咽后消化道的管壁可分为四层：粘膜层、粘膜下层 、肌层和浆膜层。其中变化最大的是粘膜层上皮。食道为复层上皮，部分区域具有由单层柱 状上皮细胞构成的突起。胃Y形，粘膜表层为单层柱状上皮，胃贲门部和盲囊部都具有发达 的皱襞和胃腺，胃幽门部无胃腺。小肠上皮为单层柱状上皮，小肠绒毛发达。小肠与直肠连 接处有瓣膜。直肠粗短，其上皮为假复层柱状上皮。

A Study of the Morphology and Histology of the Digestive Tract of the Sebastes schlegeli(Hilgendorf)

The digestive tract of Sebastes schlegeli(Hilgendor f) is short and it is of typical features of carnivorous fish. It can be divided into oropharyngeal cavity, oesophagus, stomach, small intestine, rectum and anu s. The oropharyngeal cavity is covered by muti-layered epithelium cells and tas te buds are present in the mucosa. The tract after the pharynx consists of tunic a mucosa, submucosa, lamina muscularis and serosa. The oesophagus bears stratifi ed epithelium and some regions are single-layered columnar epithelium. The Y-s haped stomach shows a single-layered columnar epithelium. In the cardiac part a nd caecum gastricus, there are well-developed plicae, gastric pits and gastric glands, while there are no gastric glands in the pyloric part. The small intesti ne epithelium is composed of columnar cells. There is a valve between the small intestine and the rectum. The mucose of rectum is formed by pseudostratified col umnar epithelium cells.