An electron microscopic study on the development of muscle spindles.
D000818:Animals; D002454:Cell Differentiation; D005260:Female; D005333:Fetus; D008854:Microscopy, Electron; D009132:Muscles / Q000196:embryology* / Q000648:ultrastructure; D011247:Pregnancy; D051381:Rats; D011919:Rats, Inbred Strains