[Correlation between the prostatic vessels and vertebral venous system of the dog].

We examined the correlation between the intrapelvic vessels, especially prostatic vessels, and the vertebral venous system in the male dog by radiography. Aorta abdominalis branches the right and left external iliac arteries at the 6th lumbar vertebra, and is divided into the right and left internal iliac arteries and arteria sacralis mediana at the 7th lumbar vertebra. Arteria urogenitalis arises from the internal iliac artery at the middle of articulatio iliosacralis, and is divided into arteria vesicalis caudalis cranially and arteria prostatica caudally. Arteria prostatica is divided in the prostatic capsule and distributed to the prostatic parenchyma in which arteries form the network. Vena prostatica is distributed to the prostatic parenchyma, forming the network and entered vena urogenitalis after joining vena vesicalis caudalis. Vena urogenitalis joins the internal iliac vein, and then the common iliac vein and vena cava posterior after joining the external iliac vein. The anastomosis between the intrapelvic vein and the vertebral venous system is formed by the vena intervertebralis. The vertebral venous system is anastomosis with the vena cava posterior, the common iliac vein, the internal iliac vein and vena pudenda interna.