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J Anat. 1983 Jan;136(Pt 1):175-9.

The arrangement of muscle fibers and tendons in two muscles used for growth studies.

Abstract

The arrangement of muscle fibres and tendons was examined in the soleus muscle of rats from 6 to 175 days post partum. The muscle was seen to change from a simple structure, with mean fibre length of approximately 90% of complete muscle length, to a unipennate structure, with mean fibre length of only about 60% of muscle length. The dog pectineus muscle was also investigated and found to have a bipennate structure throughout postnatal growth. The arrangement of muscle fibres in both these muscles is such that it might be difficult (particularly in the older animals) to cut a transverse section through all the fibres contained in the muscle; some fibres might not enter the plane of section. Results on muscle fibre number in these muscles at different ages may therefore be misleading.

PMID:
6833118
PMCID:
PMC1171938
[Indexed for MEDLINE]
Free PMC Article

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