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Journal of Electron Microscopy 44(5): 307-310 (1995)
© 1995 Oxford University Press

Capillaries with Fenestrae in the Rat Soleus Muscle after Experimental limb Immobilization

Sadaaki Oki, Junzo Desaki*, Yoshiro Matsuda, Hideo Okumura and Taihoh Shibata

Department of Orthopedic Surgery Ehime, 791-02 Japan
*Department of Anatomy, Ehime University School of Medicine Ehime, 791-02 Japan

Capillaries in the rat soleus muscle were examined by electron microscopy 4 weeks after limb immobilization and compared to those in untreated muscle. Immobilized muscles showed degenerative changes such as dissolution of sarcomeres, vacuoles, and a small increase in connective tissues, including collagen fibers, around muscle fibers. Eight percent of the capillaries in these muscles were found to have fenestrae. The non-nuclear portions of the endothelial cells were extremely thin and were perforated by several fenestrae which were bridged by a single-layered diaphragm. The untreated muscles contained only continuous capillaries. These findings suggest that the occurrence of capillaries with fenestrae in the immobilized muscle may be a result of structural changes in the muscle.

Keywords     rat, skeletal muscle, immobilization, capillary, fenestrae

Received     23 March 1995, accepted 3 August 1995


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