Gametogenisis, fertilization, and the first week; the second week; the third week; the fourth week; development of the peripheral nervous system; embryonic folding - development of the heart; development of the vasculature; development of the gastrointestinal tract; development of the urogenital system; development of the limbs; development of the head, the neck and the eyes and the ears - development of the head and neck, development of the eyes, development of the ears; development of the brain and cranial nerves; development of the integumentary system; foetal development and the foetus as patient.
