Venous drainage follows the course of the arterial system. '''Medullary veins''' are large and tortuous. The '''ovarian artery''' is closely associated with the '''uterine vein'''. This is important for the transfer of luteolytic PGF2α from the [[Female Reproductive Tract - Horse Anatomy#Uterus|uterus]] to the ovary. | Venous drainage follows the course of the arterial system. '''Medullary veins''' are large and tortuous. The '''ovarian artery''' is closely associated with the '''uterine vein'''. This is important for the transfer of luteolytic PGF2α from the [[Female Reproductive Tract - Horse Anatomy#Uterus|uterus]] to the ovary. |