Chinese Giant Salamander Of The Circulatory System Anatomy And Histology

In order to enrich the content of the anatomy and histology about Andrias Davidianus,obtain new data about systematic position and blood circulation physiology and also provide reference for comparative anatomy and vertebrate evolution reseach , we studied the anatomy and histology about Andrias Davidianus by means of normal inject method , normal paraffin section method, microcopy system and digital camera.Examination shows that the heart of Andrias Davidianus have three chamers-two atria and one ventride ,the atria on the left of midline, the ventricle on the right of midline,and the atria are divided into two cavities by septum interatriale . There are four Valvula semilunaris in conus arteriosus, but no spiral valve in conus arteriosus. The coronary artery is made by Arterica carotis externa branches. The Ductus carotis arteriosus and Ductus Botalli are still present and link up the arterial arches separately. There are two Aa. gastrica , one coming from Aorta dorsalis directed branch, the other coming from A. gastrolinealis which branch ofAa. coeliacomesenterica . The veins: the Vena postcardinalis and V. cava posterior still exist. There are no communication branch between V. portae renalis and V. cava posterior ;V. oviductlis join V. portae renalis；There are three branches enter the liver:①V. pancreaticoduodenalis V. mesenterica and A. gastrolinealis join together and then enter the right liver;②V. gastrica anterior V. oesophagea join together and then enter the left liver③V. abdominalis enter the liver by the ortho-axis of liverThe characteristic of histology about the heart and blood vessels: Cardiac muscle cells are not linked by the structure of intercalated discs; the endothelium of blood vessels is simple columnar epithelium.