[Solved] ________ The most common numerical autosomal abnormality A)47, XXX B)45, XO C)Trisomy 18 D)Trisomy 21 E)47, XXY Caudal Vein: A term usually referring to a tail vein in laboratory animals, used for injections or sample collection. Internal Iliac Vein: A vein located in the pelvis that drains blood from the lower abdomen and pelvis into the common iliac veins. Hepatic Portal Vein: A blood vessel that carries nutrient-rich blood from the gastrointestinal tract and spleen to the liver. Postcava: Also known as the inferior vena cava, it's a large vein that carries deoxygenated blood from the lower half of the body into the heart.