Comparative Anatomical Studies on Ductus Venosus in Fetuses of Domestic Ruminants

Abstract The study has aimed to investigate and determine the anatomical position, shape, size, histological features of ductus venosus, its role as a shunt in fetal circulatory system domestic ruminants. research was conducted on 19 bovine, 11 sheep 5 goat fetuses, aborted at late stage pregnancy or deceased just after delivery. general anatomy venosus investigated by in-situ dissection corrosive cast obtained injection 25% solution Vinylite mass through umbilical vein. For examination, tissue samples were stained with Hematoxylin Eosin, Masson’s trichrome, Verhoeff-Van Gieson Gomoriꞌs silver stain. results showed that ruminant is curved, trumpet-shaped vessel, situated central part liver, above porta hepatis. Its ventral constricted form an isthmus, having prominent lip-like thickening junction portal sinus. Histological examination dominant presence collagen elastic fibers tunica media, thin bands smooth muscle oriented longitudinal circular direction indicating ability for vasoconstriction vasodilatation.