fetal structure การใช้

• In both sexes the gonad goes on to form the testes and ovaries, because they are derived from the same undeveloped structure they are considered analogous structures as they arise from different fetal structures.
• The ligament is a vestige of the ductus arteriosus, a temporary fetal structure that shunts blood from the pulmonary arteries to the aorta, in order to avoid circulating blood to the lungs, which are inactive in the womb.