Organ system development
Development of the cardiovascular system
Development of the ear
Development of the eye
Development of the face and palate
Pharyngeal arches, pouches, and clefts
Development of the digestive system and body cavities
Development of the gastrointestinal system
Development of the teeth
Development of the tongue
Development of the integumentary system
Development of the axial skeleton
Development of the limbs
Development of the muscular system
Development of the nervous system
Development of the renal system
Development of the reproductive system
Development of the respiratory system
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The limbs (arms and legs) develop around the 4th week of gestation. They develop from buds that form along the sides of the body, which start to grow into long, thin structures called "limb buds" in a proximal-to-distal direction. Limb buds consist of a central core of mesenchymal cells, covered with a layer of ectoderm.
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