title: Variation of the origin of the umbilical vein in the human placenta.
mesh_terms: D005260:Female; D006801:Humans; D010920:Placenta / Q000098:blood supply*; D011247:Pregnancy; D014470:Umbilical Cord / Q000033:anatomy & histology; D014471:Umbilical Veins / Q000033:anatomy & histology*