Summary
The distribution of capillaries in teleost and rat striated muscles was investigated using a number of different methods. A new method for directly viewing capillaries was developed.
Teleost white muscle has a capillary: fibre (C∶F) ratio of between 0.2 and 0.3; and 0.6 to 1.0 peripheral capillaries per muscle fibre. 26–49% of fibres had no peripheral capillaries. Values for the rat gastrocnemius were 1.2, 2.6 and 4.8% respectively which compares well with literature values.
Flathead red muscle had a C∶F ratio of between 1.9 and 2.5; and between 5.3 and 6.6 peripheral capillaries per muscle fibre depending on the method used. Values for rat soleus were 1.8 and 4.1 respectively.
Teleost pink fibres had an intermediate number of capillaries.
Rat striated muscle, particularly the gastrocnemius, was found to be heterogeneous with respect to the distribution of capillaries. Flathead red muscle was homogeneous whilst teleost white muscle was only slightly variable.
Flathead red muscle fibres are well supplied with subsarcolemmal mitochondria. These show a clumped distribution corresponding to the position of capillaries. In contrast teleost white fibres are almost totally devoid of these and all other mitochondria.
No differences were observed in the vascularisation of either muscle type along the length of the fish.
The results are discussed in relation to the division of labour between fibre types during swimming.
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The author wishes to thank Dr. R.C.L. Hudson and Professor G.D. Campbell for their useful criticism of the manuscript. The technical assistance of Mr. I.L. Gibbins in operating the JEOL electron microscope is also gratefully acknowledged
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Mosse, P.R.L. The distribution of capillaries in the somatic musculature of two vertebrate types with particular reference to teleost fish. Cell Tissue Res. 187, 281–303 (1978). https://doi.org/10.1007/BF00224371
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DOI: https://doi.org/10.1007/BF00224371