Evidence for connections of the sarcoplasmic reticulum with the sarcolemma and with the Z line in skeletal muscle fibers of fetal and newborn rats.
D000818:Animals; D000831:Animals, Newborn; D002462:Cell Membrane; D005333:Fetus / Q000033:anatomy & histology*; D008854:Microscopy, Electron; D009132:Muscles / Q000166:cytology*; D009210:Myofibrils; D051381:Rats; D012159:Reticulum; D012508:Sarcolemma