Key result
Stretching of rat skeletal muscle induced a large cytoplasmic space devoid of myofibrils at the ends of lengthening fibers, containing irregularly running tubular elements and orderly spaced SR.
The orderly spacing of the sarcoplasmic reticulum in stretched rat skeletal muscle suggests a potential role in myofibril assembly and/or T tubule arrangement.
The transverse (T) tubules and the sarcoplasmic reticulum (SR) at the myotendinous junction of stretched rat skeletal muscle were examined by conventional and intermediate voltage electron microscopy. Stretching induced a large cytoplasmic space devoid of myofibrils at the ends of lengthening fibers. In this space, irregularly running tubular elements were seen. They were connected both with subsarcolemmal caveolae and with T tubules traversing to the A-I junctional level of the preexisting myofibrils. The SR was arranged at regular intervals which were narrower than those of the adult sarcomere. This orderly spacing of the SR seems to indicate that they may play some role(s) in myofibril assembly and/or T tubule arrangement.
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Sonoda et al. (1993) studied Stretched skeletal muscle. Stretching was evaluated on Morphological changes in transverse tubules and sarcoplasmic reticulum. Stretching of rat skeletal muscle induced a large cytoplasmic space devoid of myofibrils at the ends of lengthening fibers, containing irregularly running tubular elements and orderly spaced SR.
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