条石鲷消化道的形态学和组织学

采用解剖和光镜技术研究条石鲷消化道的形态学和组织学。条石鲷消化道包括具有发达颌齿的口咽腔，食道，胃，小肠和直肠。食道上皮组织可分为两个区域－头部和尾部，头部区域由扁平上皮层构成，尾部区域的上皮组织由单层柱状上皮细胞所构成，上皮含有大量 杯状细胞和黏液分泌细胞.胃呈V形，其粘膜上皮由单层柱状上皮组成，贲门部和胃体部上皮下有发达的胃腺组织。小肠上皮为具微绒毛的单层柱状上皮，肠道粘膜固有层中有管状肠腺存在；直肠上皮为单层柱状上皮，缺乏粘膜肌。小肠和直肠上皮中均分布有较多的杯状细胞，肠道系数约为0.78。在整个消化道中发现有四种杯状细胞。本文研究了条石鲷消化道的显微结构，并探讨了其消化道的组织学和解剖学特征与其杂食性的适应。

Morphology and histology of digestive tract in Oplegnathus fasciatus

Oplegnathus fasciatus, a marine fish, is of commercial value. With the development of marine aquaculture, the potential culture prospect of Oplegnathusfasciatus is becoming more and more optimistic. And thus it is essential to get appropriate feeds for it. So as a theoretical reference, the morphology and histology of the digestive tract in Oplegnathus fasciatus were studied by optical microscopes. The digestive tract in Oplegnathus fascicaus consists of the buccal-pharynx cavity with well-developed mandibular teeth, oesophagus, stomach, intestine and rectum. The oesophagus shows two portions, cranial with pavement epitheliums and caudal with simple columnar epitheliums, and there are many goblet cells and mucous secretory cells in the epitheliums of oesophagus. The V-shaped stomach has a single-layered columnar epithelium under which,in the cardiac and fundic portion, well-developed gastric glands are present. The intestine epithelium is composed of simple columnar cells with a distinct microvillus brush border, in which intestinal glands are distributed, while no muscularis mucosa is detected in the rectum. There are many goblet cells in the epithelium of the intestine and rectum. Meanwhile the average intestinal coefficient of Oplegnathus faseiatus was calculated, which came to about 0. 78. Four types of goblet cell were also found in the whole digestive tract. In this paper, the microscopic structure of the digestive tract was studied,and it was proved that the histological and anatomical features of its digestive tract were consistent with the omnivorous habits of Oplegnathus faseiatus. It was expected that greater efforts should be made to have a further study on histochemistry of the digestive tract in Oplegnathusfasciatus.