PMID: 9183034May 1, 1997Paper

Fibre type grouping in porcine masseter and soleus muscles assessed by the enclosed fibre type concept. A statistical and computational analysis

Journal of Oral Rehabilitation
D Ström, S Holm

Abstract

Muscle function is determined not only by the frequency of slow (type I) and fast (type II) fibres but also the spatial fibre type organization. During ageing as well as in muscle disorders, divergencies from the normal pattern may occur and are expressed as 'fibre-type grouping'. To elucidate whether intramuscular differences in spatial fibre type arrangements may underlie the functional heterogeneity of the porcine masseter, the arrangements of intrafascicular type I and type II fibres were assessed in terms of the number of enclosed fibres in whole fascicles. The intrafascicular proportions of edge- and centrally located type I and type II fibres were investigated. Two hundred and forty-two porcine masseter fascicles (six masseters) and 63 pig soleus fascicles (five soleus muscles) were investigated by ATP-ase histochemistry. All fascicles were from 11 domestic pigs (1 year, 70-90 kg body weight, all female). Sixty-nine to 90% of the total fibres were type II fibres in the porcine masseter (P < 0.01). In four of five soleus muscles the type II fibre population was dominant. No enclosed type I fibres could be identified in the porcine masseter muscles. This was in contrast to the finding of 1270 enclosed type II fibres. Five ...Continue Reading

Citations

Sep 13, 2003·Nursing Philosophy : an International Journal for Healthcare Professionals·C A Niven, P A Scott
Jun 16, 2006·Nursing Philosophy : an International Journal for Healthcare Professionals·P Anne Scott
Jun 16, 2006·Nursing Philosophy : an International Journal for Healthcare Professionals·Joan McCarthy
Jun 16, 2006·Nursing Philosophy : an International Journal for Healthcare Professionals·Søren Holm

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