The spiral pattern during development.
D000818:Animals; D005314:Embryonic and Fetal Development; D005121:Extremities / Q000196:embryology; D005260:Female; D005865:Gestational Age; D006257:Head / Q000196:embryology; D006801:Humans; D009132:Muscles / Q000196:embryology; D011247:Pregnancy; D013249:Sternum / Q000196:embryology; D014714:Vertebrates / Q000196:embryology