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Fine structure of tortoise skeletal muscle
Author(s) -
Page Sally G.
Publication year - 1968
Publication title -
the journal of physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.802
H-Index - 240
eISSN - 1469-7793
pISSN - 0022-3751
DOI - 10.1113/jphysiol.1968.sp008583
Subject(s) - sarcomere , myofibril , anatomy , tortoise , triad (sociology) , electron microscope , protein filament , chemistry , skeletal muscle , biophysics , biology , crystallography , physics , myocyte , optics , zoology , microbiology and biotechnology , psychology , biochemistry , psychoanalysis
1. The fine structure of tortoise skeletal muscle has been studied with the electron microscope. 2. The packing of the A filaments (1·6 μ long) and the I filaments (2·35 μ long) within the myofibril is similar to that in frog twitch fibres. 3. The position of the N line within the I band is found to vary with the sarcomere length. 4. The T‐system tubules in these muscles form a three‐dimensional network across the fibre at the level of the I band. On either side of the Z line it forms triad relationships with the other network of tubules of the sarco‐plasmic reticulum.