Prenatal development

Indifferent Penis of Human Embryo: Medical visualization of an embryonic indifferent penis at 7 weeks. The external genitalia of men and women are derived from the same (homologous) tissues. Shown are the genital tubercle (which will become the penis or the clitoris), urogenital groove and sinus (which will become the bladder and urethra, and also forms the vagina and hymen), labioscrotal folds (which will form the scrotum or the labia majora), and anal groove. These indifferent structures form by the end of the 7th week of development, and fully differentiate into male or female by week 12.

Prenatal or antenatal development is the process in which a human embryo and later fetus (or foetus) develops during pregnancy, from fertilization until birth. Often, the terms fetal development, or embryology are used in a similar sense.

After fertilization, the process of embryogenesis (the early stages of prenatal development) begins. By the end of the tenth week of gestational age the embryo has acquired its basic form and the next period is that of fetal development where the organs become fully developed. This fetal period is described both topically (by organ) and chronologically (by time) with major occurrences being listed by gestational age.

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