Fine structure of transverse tubules and the sarcoplasmic reticulum at the myotendinous junction of stretched muscle fibers of the rat
✍ Scribed by Masaki Sonoda; Hideshige Moriya; Dr. Yutaka Shimada
- Publisher
- John Wiley and Sons
- Year
- 1993
- Tongue
- English
- Weight
- 924 KB
- Volume
- 24
- Category
- Article
- ISSN
- 1059-910X
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✦ Synopsis
The transverse (TI tubules and the sarcoplasmic reticulum (SR) a t 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 a t regular interverals 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. Q 1993 Wiley-Liss, Inc.