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Volume :21 Issue : 2 1994      Add To Cart                                                                    Download

Muscle fiber type, number and size in the EDL and soleus of Jaculus jaculus

Auther : M. A. ALNAQEEB AND E. AL-BAKER

 Department of Zoology, University of Kuwait, P.O. Box 5969, Safat 13060, Kuwait

 ABSTRACT

The adaptation of the extensor digitorum longus (EDL) and soleus muscles of Jaculus jaculus to bipedal movement was examined. Fiber type, number and diameter in both muscles were analyzed and compared to mouse muscles. Total fiber number in jaculus muscles was higher than mouse. The EDL was dominated by FOG fibers, while the soleus was dominated by SO fibers. Fiber diameter appears to reflect the load placed on each filter type during locomotion. The relative ratios of the fiber types and fiber diameter in each muscle appears to be adapted to the bipedal mode of locomotion. The EDL being mostly fast and predominantly oxidative and glycolytic, while the soleus being purely slow with no glycolytic fibers.

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