Fiber types distribution in the digastric muscle of tufted capuchin monkey (Cebus apella).
Fiber types distribution in the digastric 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 Oxidative), 38.4% FOG (Fast Oxidative 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%) suggests that this muscle possesses an additional role than that related to the lowering of the jaw.
Andreo
J C
JC
Department of Morphology, UNESP Campus of Botucatu, Rubiao, São Paulo, Brazil.
Pai
V D
VD
Navarro
J A
JA
de Oliveira
J A
JA
D000818:Animals; D002428:Cebus / Q000033:anatomy & histology* / Q000502:physiology; D006651:Histocytochemistry; D008297:Male; D008410:Masticatory Muscles / Q000033:anatomy & histology* / Q000502:physiology