大黄鱼消化道器官显微与亚显微结构

Microstructure and ultrastructure ofdigestive organ of Pseudosciaena crocea

采用电镜和光镜技术研究大黄鱼消化道的组织结构。大黄鱼舌粘膜上皮为复层扁平上皮,其中含有杯状细胞和味蕾,舌腹面固有膜有浆液性腺泡;食道粘膜上皮为复层扁平上皮,表层扁平细胞下有粘液细胞。胃粘膜上皮为单层柱状,细胞游离端含有大量成熟粘液原颗粒,核周有不同成熟阶段的粘原颗粒,细胞器位于核周及下方,贲门和盲囊部胃小凹处有粘液腺,固有膜含大量胃腺,幽门部没有胃腺;胃腺细胞为矮锥形,细胞内含有微管泡系和酶原颗粒,是一种典型的泌酸胃酶细胞。前肠、中肠和后肠粘膜上皮均为单层柱状上皮,其中有许多杯状细胞,肠上皮有密集的微绒毛,侧面有连接复合体,胞内各种细胞器均较丰富。大黄鱼消化道组织结构的特点与消化、吸收作用密切相关。

The histological structure of digestive tract of Pseudosciaena crocea was studied using light and electronic microscopy. The epithelium of lingual mucosa was multilayered epithelium and contained mucussecreting cells and taste buds. There were serous alveolis in menbrana propria of lingual ventral region. The oesophagus covered a multilayered epithelium and the mucous cells under the squamous cells. The stomach mucosa epithelium formed with a singlelayered columnar epithelium, a great deal number mature mucinogen granules were present in the free edge of the cells, and immature stages mucinogen granules in the around near nucleus of the cell, and the cell organs were present in circumambient and under the nucleus. There were mucous glands in the cardiac and fundic portion, and the stomach glands were present in the membrana propria enormously, and absent in the pylorus. The stomach cell shape was short taper, typical oxynticopeptic cell, in which there were tubulovesicular systems and pepsinogenic granules. The fore, mid and hind intestine epithelium was singlelayered columnar epithelium, and there were a lot of mucussecreting cells and dense microvillus in the epithelium, and the connecting complex was present in lateral edge, and abundant cell organs in the cells. The results showed that there were close correlation between the characteristic of histology structure of digestive tract and digestion and absorption of Pseudosciaena crocea.