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Mature human egg and sperm
Maturation of sperm and egg
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abnormalities adult amniotic amniotic sac arms and legs become belly wall birth bladder blood vessels bones brain called cartilage cartilage model changes chest child chromosomes circulation cleft completely degenerate descent egg cells embryo embryology embryonic disc external eyes fertilization fetal fetus fetuses fingers and toes formation function fuse fusion 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 mother's mouth muscles neck nerve neural plate newborn infant normal occur ovary ovum pelvis penis period placenta region ridge scrotum second month seven-month sex cords sex ducts sex glands sex organs sexual development sexual organs side sixth month skin sperm structures surface tail testes testis third month tissue trophoblast tubules twins umbilical cord upper urethral usually uterine tubes uterine wall uterus vagina variations yolk yolk-sac