Increase in number of intrafusal muscle fibres during the development of muscle spindles in the rat.
D000818:Animals; D002455:Cell Division; D002467:Cell Nucleus; D009470:Muscle Spindles / Q000033:anatomy & histology / Q000166:cytology / Q000196:embryology*; D009210:Myofibrils / Q000166:cytology; D051381:Rats