title: Some problems of the developmen and aging of nervous system. I. Spinal cord in the 2nd half of fetal life and early infancy.
mesh_terms: D000375:Aging; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D009186:Myelin Sheath; D011247:Pregnancy; D011712:Pyramidal Tracts / Q000254:growth & development; D013116:Spinal Cord / Q000196:embryology / Q000254:growth & development*