Upper limb tissue differentiation in the human embryo.
The major histologic process throughout the fetal period is differential growth. Most congenital deformities occur in the third through the seventh weeks, when the tissues are rapidly developing. After the seventh week, certain types of insults may result in deformity, but the intricate structures of the limb have been determined in the time between the third and eighth postovulatory weeks.
D001132:Arm / Q000196:embryology*; D001808:Blood Vessels / Q000196:embryology; D002454:Cell Differentiation; D000013:Congenital Abnormalities / Q000196:embryology; D005314:Embryonic and Fetal Development; D005260:Female; D006225:Hand / Q000196:embryology*; D006801:Humans; D007596:Joints / Q000196:embryology; D009132:Muscles / Q000196:embryology; D010012:Osteogenesis; D010525:Peripheral Nerves / Q000196:embryology; D011247:Pregnancy