Deoxygenated fetal blood passes through umbilical arteries to the placenta. Hematopoietic stem cells are found in the bone marrow and umbilical cord blood. Roskam supported adult and umbilical cord stem cell research. Male fetal pigs have an urogenital opening located behind the umbilical cord. Abdominal ultrasound can be used to visualize the insertion site of the umbilical cord. It is used in ultrasound testing of umbilical artery for placental insufficiency. The umbilical cord is available after a birth. There is only one umbilical vein in the human umbilical cord. Branches of the umbilical arteries carry embryonic blood to the villi. Menstrual discharge from the umbilicus is a rare disorder associated with umbilical endometriosis. In the third stage, delayed clamping of the umbilical cord is generally recommended. Other early symptoms may include inguinal and umbilical hernias. Many children also have umbilical or inguinal hernias. There is decrease in magnitude of umbilical venous volume flow. Apep's origin usually describe it as being born from Ra's umbilical cord.