Abstract

The bender muscle in the walking limb of the Pacific shore crab (Pachygrapsus crassipes) is composed of fibers with different structural (sarcomere length) and histochemical (NADH diaphorase and myofibrillar ATPase) properties. Slow fibers are located along the dorsal margin of the muscle and along the ventral margin in the distal portion of the muscle. The remaining bender muscle is composed of intermediate-type fibers, which can be differentiated into two groups based upon the pH sensitivity of the myofibrillar ATPase activity and the polysaccharide content of the fibers.

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