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Structure of muscle fibres and motor end plates in extraocular muscles of the grass snake, Natrix natrix L.

Authors
  • Witaliński, W
  • Loesch, A
Type
Published Article
Journal
Zeitschrift für mikroskopisch-anatomische Forschung
Publication Date
Jan 01, 1975
Volume
89
Issue
6
Pages
1133–1146
Identifiers
PMID: 1234815
Source
Medline
License
Unknown

Abstract

Six extraocular muscles of the grass snake, Natrix natrix L. together with their motor end plates were examined in the light and electron microscope, and the measurements of the diameter of muscle fibres and the area of their motor end plates were performed. Morphologically, two types of muscle fibres: tonic and red phase ones were distinguished. The former fibres, 2,3 to 14,5 mum in diameter possess single or multiple (up to five on a single fibre) "en grappe" motor end plates, without postsynaptic junctional folds. The latter fibres, 10...40 mum in diameter have single, "en plaque" motor end plates, with numerous postsynaptic junctional infoldings. The morphological features of muscle fibres and motor end plates as well as the correlation between the diameter of muscle fibres and the area of motor end plates are discussed.

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