title: The structure of the cusps of valves in the human foetal great saphenous vein.
abstract: The study was performed on 110 great saphenous veins in human foetuses of both sexes aged 9 to 37 weeks. The earliest well-shaped valves were observed in foetuses aged 13 weeks. In these foetuses the number of valves varies from 2 to 7. Consecutive microscopic sections revealed that the developing valves at their origin present thickening of the endothelium which is continuous into the cusps of the valves. The bicuspid cusps are crescent-shaped and both surfaces are lined by endothelium.
mesh_terms: D019521:Body Patterning / Q000502:physiology; D005260:Female; D005333:Fetus / Q000196:embryology* / Q000502:physiology; D006801:Humans; D007866:Leg / Q000098:blood supply; D008297:Male; D012039:Regional Blood Flow / Q000502:physiology; D012501:Saphenous Vein / Q000196:embryology* / Q000502:physiology