[Morphology and development of bovine testicular vein (V. testicularis) during the prenatal and neonatal periods].

Investigation into the morphology and development of the testicular vein in bovine was carried out with 85 male foetuses from the 8-40th week of pregnancy and with 10 newborns aged 1 to 10 days of life, the total being 95 preparations. The age of the foetuses was determined by Kantorova method complemented with those by other authors. The observations were made with using rubber latex introduced into the lumen of the tested veins by means of an automatic device of our own construction. It was found out that the developmental transformations of the testicular veins, initiated in the embryo, progress very dynamically in foetuses up to about the 20th week of pregnancy and them gradually slow down in older foetuses. Finally, in a fully formed testicular vein of the oldest foetuses and newborns there can be distinguished the proximal and distal part of this vessel. The proximal part carries the blood away from labile components of the testicular vein, the only exceptions being the aortic branch and the ureteral vein. Now, the solid components escape into the distal part of testicular vein. In the course of the distal part of the vessel there are its three basic plexuses, i.e. the testicular plexus, the marginal plexus of testicular vein and the largest of them--the pampiniform plexus of testicular vein. The blood from the last plexus is carried away into the main trunk of testicular vein by two anastomotic branches--lateral and medial. Of the veins examined the right one usually escapes to the caudal vena cava or to the deep circumflex iliac vein, while the left one to deep circumflex iliac vein or to the common iliac vein.