THE ATRIAL ARTERY IN CHINESE Ⅱ. ANASTOMOSIS OF THE ATRIAL ARTERIES / 解剖学报

ABSTRACT

1.There were 80 heart specimens(age17～95,with no marked pathological chauges) used to observe the origin,course and the site of anastomosis of the atrial arteries. 2.Within the 80 specimens there are 34 hearts with anastomoses,and the frequen- cies of the anastomoses are 53,including one case of anastomosis between an artery of extracorary origin and the atrial artery. 3.The commonest site of the anastomosis is the posterior wall of the left atrium, there are 23 cases(43.40%)within the 53.The other sites are the base of interatrial septum,13 cases(24.53%);anterior wall of the atrium,13 cases(24.53%);the lateral wall of the right atrium and the orifice the superior vena cava being 2 cases respecti- vely(3.77%). 4.The diameters of the anastomosis are as followsIn the A.B.S.castsWe have measured the anastomotic diameter in 38 cases.Most of them are within the range of 100～200?m in 20 cases(52.6%),200～300?m in 9 cases(23.6%). In dissecting specimensWithin the measured 19 cases,50～100?m in 8 cases (42.1%),100～200?m in 5 cases(26.3%),200～300?m in 3 cases(15.8%),300～ 500?m in 3 cases(15.8%).Among the adult hearts,it seems that the diameter of the anastomosis and the site of the anastomosis are not increased by advancement of the age. 5.The origin of the anastomotic branch of the A-V node artery is near the A-V node.This is very important for the blood supply of A-V node,when there is patholo- gical changes of the coronary artery. 6.Since there is a great range of variation in the diameter of the anastomosis and the formation of the anastomosis,such as two-branches-form,three-branches-form, four-branches-form,or network-like anastomosis,perhaps,the morphological charact- eristics of the anastomosis is closely related with the pathogensis of coronary artery. 7.In this set of specimen,we have observed three cases in which the ventricular branches of the coronary artery joined the anastomosis on the wall of the atrium.