Fiber Types Distribution in the Digastric Muscle of Tufted Capuchin Monkey (Cebus apella) |
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| Authors: | J C Andreo V D Pai J A C Navarro J A DE Oliveira |
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| Institution: | Department of Morphology, School of Odontology of Bauru, 17043–101, IB, UNESP, Botucatu;Department of Morphology, School of Odontology of Bauru, 17043–101, UNESP, Araçatuba;Department of Morphology, School of Odontology of Bauru, 17043–101, SP, Brazil |
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| Abstract: | Fiber types distribution in the diagastric muscle of tufted capuchin monkey was studied by means of NADH-TR, myosin-ATPase, after alkaline and acid preincubations and SDH histochemical reactions. Three different types of fibers were found presenting an equal distribution. The percentage and types of fibers were as follow: 18.2 % SO (Slow Oxydative), 38.4 % FOG (Fast Oxydative Glycolytic) and 43.4 % FG (Fast Glycolytic). FG fibers revealed the largest area. The relatively high concentration of fast twitch (81.2 %) seems to indicate this muscle is involved with the acceleration and fast speed of jaw movements. Aerobic metabolism represented by SO + FOG fibers (56.6 %) suggestes that this muscle possesses an additional role than that related to the lowering of the jaw. |
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