摘要
本文对东方对虾消化道及肝胰脏进行大体解剖和组织学观察,并将其结构与功能同其它主要十足动物作比较。 前肠和后肠内壁有几丁质层覆盖,中肠则没有。食道壁向四个角落内褶,在其表皮层之下的结缔组织中充满皮肤腺,环肌层连续,纵肌成束分散排列:胃的组织学结构除没有皮肤腺分布外,大体与食道相似。中肠从胸部延伸到第六腹节前区,约占消化道总长的60％,其上皮是一层柱状细胞,环肌层薄,纵肌成束分散排列;中肠前,后盲囊分别从中肠的前端和后端发出。后肠是一短管,内壁突出四个大的垫状隆脊,肛门开口于尾节腹面,和食道一样后肠壁分布大量皮肤腺:后肠上皮由单层柱状细胞组成,环肌层连续,纵肌在后肠前段成束分散排列于环肌之下,在后段则在环肌层之上。肝胰脏由许多分支肝小管构成,肝小管内壁为单层柱状上皮,中央为管腔:肝管细胞分为分泌细胞、吸收细胞、纤维细胞和原始细胞四种。原始细胞是一种未分化的细胞,分布于肝小管末端。
The anatomy and histology of the alimentary tract and hepatopan-creas of the Penaeus orientalis have been carried out. The structure and functions have been compared with a number of other decapods.The fore-gut (oesophagus and stomach) and hind-gut are lined with cuticle, which is lacking in the mid-gut.The oesophageal wall is folded inward between the corners. Below its epithelium the connective tissue is packed with tegumental glands. The oesophagus is enclosed by a layer of circular muscle, beneath whichThe anatomy and histology of the alimentary tract and hepatopan-creas of the Penaeus orientalis have been carried out. The structure and functions have been compared with a number of other decapods.The fore-gut (oesophagus and stomach) and hind-gut are lined with cuticle, which is lacking in the mid-gut.The oesophageal wall is folded inward between the corners. Below its epithelium the connective tissue is packed with tegumental glands. The oesophagus is enclosed by a layer of circular muscle, beneath which lie discrete bundles of longitudinal fibers. Historically the stomach has the same general appearance as the oesophagus with the exception that tugumental glands are absent.The mid-gut extends from the thorax to the anterior region of the sixth abdominal somite, and is about 60% of the total lenght of the alimentary tract. The mid-gut is lined with columnar epithelium. The circular muscle is thin, and the longitudinal fibers are arranged in discrete bundles. Two dorsal caeca (anterior mid-gut caeca and posterior mid-gut caecum) arise from the anterior and posterior ends of the mid-gut respectively.The hind-gut is a short tube, which possesses four large padlike ridges, and openes to the exterior by the anus. Like the oesophagus, the tegumental glands are found in great numbers in the hind-gut. The epithelium of the hind-gut is a layer of columnar cells. The circular muscle is enclosed and the discrete bundles of longitudinal fibers are beneath the circular muscle in the fore region, and are above the circula
关键词
东方对虾
消化系统
肝脏解剖
组织学观察
Penaeus orientalis
Digestive system
Oesophagus
Stomach
Mid-gut
Hind-gut
Hepatopancreas
