Direction of spiral of the umbilical cord.
D004292:Dominance, Cerebral; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D012399:Rotation; D014469:Umbilical Arteries / Q000033:anatomy & histology; D014470:Umbilical Cord / Q000033:anatomy & histology*; D014471:Umbilical Veins / Q000033:anatomy & histology