Buddington Randal K, Doroshov Serge I
Department of Physiology, UCLA Medical Center, Los Angeles, California 90024.
Department of Animal Science, University of California, Davis, California 95616.
J Morphol. 1986 Nov;190(2):201-213. doi: 10.1002/jmor.1051900205.
The anatomy and histology of the white sturgeon digestive system is described for the adult stage and the first 36 days of posthatch development. Although the adult gut is only 87% of standard length, absorptive surface area is effectively increased by the thick mucosa of the postgastric gut and by lengthening of the gut due to the presence of the spiral valve and the pyloric caecum. Modifications of the gut of this species, relative to that of other chondrosteans, are consistent with its durophagous feeding habits. The arrangement of the intestinal epithelium differs from that of most fish and is organized so that absorptive activities occur in deeper regions, whereas goblet cells dominate the lumenally exposed epithelium. The gut develops from an intraembryonic yolk endoderm. At conclusion of the endogenous nutrition phase the alimentary canal is similar to the adult form and a functional gastric region is present. The anatomical characteristics coincide with physiological data collected throughout the life history of this species.
本文描述了成年白鲟以及孵化后36天内幼鱼阶段消化系统的解剖结构和组织学特征。尽管成鱼肠道长度仅为标准体长的87%，但由于胃后肠道黏膜较厚，以及螺旋瓣和幽门盲囊的存在使肠道延长，有效增加了吸收表面积。相对于其他软骨硬鳞鱼类，该物种肠道的适应性变化与其食硬食物的摄食习性一致。肠上皮的排列方式与大多数鱼类不同，其组织方式使得吸收活动发生在更深的区域，而杯状细胞则在管腔暴露的上皮中占主导地位。肠道由胚胎内的卵黄内胚层发育而来。在内源性营养阶段结束时，消化道与成鱼形态相似，且存在功能性胃区。这些解剖学特征与该物种整个生活史中收集到的生理学数据相符。
