title: Morphological evidence concerning the problem of skin ridge formation.
mesh_terms: D002196:Capillaries / Q000196:embryology; D002455:Cell Division; D004475:Ectoderm / Q000166:cytology; D005385:Fingers / Q000098:blood supply / Q000196:embryology* / Q000294:innervation; D005865:Gestational Age; D006801:Humans; D008854:Microscopy, Electron; D009024:Morphogenesis; D009474:Neurons / Q000166:cytology; D012867:Skin / Q000196:embryology*; D013545:Sweat Glands / Q000196:embryology