Extremities of a placental villus. Labels: a, lining membrane of the vascular system of the mother; b, cells immediately lining a; d, space between the maternal and fetal portion of the villus; e, internal membrane of the chorion; f, internal cells of the villus, or cells of the chorion; g, loop of umbilical vessels.

Placental Villus

Extremities of a placental villus. Labels: a, lining membrane of the vascular system of the mother;…