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i0 Embryo at the end of first month
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abnormalities adult amniotic amniotic sac arms and legs become birth bladder blood vessels bones brain called cartilage cartilage model changes chest child chromosomes cleft completely degenerate descent egg cells embryo embryology embryonic disc eyes female fertilization fetal fetus fetuses fingers and toes formation fourth month function fuse genital tubercle gonad groove grow head heart human body human embryo individual inguinal canal inter-sex internal organs intestine kidney layer ligament liver lower end lungs male mature membrane ment middle kidney Miillerian ducts mother's mouth muscles neck nerve neural neural plate newborn infant normal occur ovary ovum pelvis penis period placenta plate region ridge scrotum second month seven-month sex cords sex ducts sex glands sex organs sexual development side sixth month skin sperm structures surface swelling tail testes testis third month tissue trophoblast tubules twins umbilical cord upper urethral usually uterine tubes uterine wall uterus vagina variations yolk-sac