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Biol Bull 175: 284-288. (October 1988)
© 1988 Marine Biological Laboratory
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Fiber Types in the Limb Bender Muscle of a Crab (Pachygrapsus crassipes)

MICHAEL P. MCDERMOTT 1 and PHILIP J. STEPHENS 1

1 Villanova University, Department of Biology, Villanova, Pennsylvania 19085

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.

Submitted on October 13, 1987
Accepted on July 27, 1988






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Copyright © 1988 by the Marine Biological Laboratory.