The morphogenesis of the vasculature in bovine fetal skin.

The morphogenesis of the blood vessels in the bovine fetal skin, from the third to the tenth month of pregnancy was studied. Bovine fetal skin was found to be divided into 'unit vascular zones'. Each unit was centrally supplied with a ramus arteriosus cutaneous. The venous blood was drained from each unit through the tributaries of the plexus venosus dermis profundus. The formation of the venous plexus started at the fourth month and the primary elements of the arterial rete developed at the sixth month of intra-uterine life.