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Journal of Electron Microscopy 48(3): 297-300 (1999)
© 1999 Oxford University Press

Aged neuromuscular junctions in the extensor digitorum longus muscle of the rat as revealed by scanning electron microscopy

Sadaaki Oki*, Junzo Desaki1, Taichi Ezaki2 and yoshiro Matsuda

Departments of Orthopaedic Surgery Japan
1Anatomy, Ehime University School of Medicine Shigenobu, Ehime 791-0295, Japan
2Department of Anatomy, Kumamoto University School of Medicine Honjo, Kumamoto 860-0811, Japan

*To whom correspondence should be addressed

We examined the overall morphology of subneural apparatuses (SNAs) at neuromuscular junctions by scanning electron microscopy in the extensor digitorum longus muscle of aged (18 months) rats. Most of aged SNAs were mainly characterized by a large number (more than 20) of cup-like depressions (2–5 urn in diameter) with numerous slit-like junctional folds about 0.1 urn wide and 5 urn at maximum length, while some SNAs consisted of a small number (fewer than 10) of depressions or poorly-developed gutters containing pit-like and/or slit-like junctional folds. Additionally, numerous slits were often found outside the depressions, possibly indicating the preexisting junctional folds persisted for a long time after the gutter-into-cup transformation of the SNAs. These structural changes of SNAs during ageing are discussed briefly.

Keywords     subneural apparatus, cup-like depression, slit-like junctional fold, aged rat, scanning electron microscopy

Received      9 August 1998, accepted 9 March 1999


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