PMID: 9542151Apr 29, 1998Paper

Non-myotendinous force transmission in rat extensor digitorum longus muscle

The Journal of Experimental Biology
P A HuijingG T Rebel

Abstract

The extensor digitorum longus muscle (EDL) of the rat hindleg consists of four heads. The heads are named after their insertions on the digits of toes II, III, IV and V. The EDL heads share a proximal tendon and aponeurosis, but have separate distal aponeuroses and tendons. By cutting the distal tendons of selected heads, direct myotendinous force transmission within these heads is prevented. Therefore, force exerted by the muscle would be expected to decrease according to the physiological cross-sectional area disconnected if myotendinous force transmission were the only mechanism of force transmission. The results indicate that EDL force production remained at high levels after acute tenotomy: muscle length-force curves did not alter significantly following cutting of the tendons of heads II and III. Cutting the tendon of head IV as well leaves only head V in its original condition. After tenotomy of head IV, length-force characteristics were altered significantly, but optimum force was maintained at 84% of that of the intact muscle. After separation of head IV from head V intramuscularly for some distance along their interface, the force dropped to much lower levels, with optimum force approaching 50% of that of the intact m...Continue Reading

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