Abstract
The nephrort and ureteral system in the fowl were investigated by the anatomical and histological observation. The nephron was classified into Nephronum corticale and medullare according to their location in the lobule. The collecting duct system carrying urine from nephron to ureter was also divided into the cortical and medullary parts, i.e., Ductulus colligens perilobularis and Ductulus colligens medullaris. Ductulus colligens perilobularis was classified in five types according to the branching modes of the Tubulus colligens. The Ductulus colligens medullaris gathering many Ductulus colligens perilobularis becames the ureteral branch and drains into the ureter. In the cross section of the Lobulus medullaris, the histological feature of the Ductulus colligens medullaris was rosette or clump in outline. These features are shown in Table 3. The ureteral branches ramifying from the proximity of the ureter to the terminal were named the Rami ureterici primarii, secundarii, and tertiarii, in regular order. The average numbers of the Rami ureterici primarii in the Divisio renalis cranialis, media and caudalis were 9.93, 5.14 and 1.43, respectively, and total average number was 16.50. The branching interval of the Rami ureterici primarii in the Divisio renalis media was wider than that in the Divisio renalis cranialis, and in the Divisio renalis caudalis it was variable.
