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Journal of Experimental Biology 49,645-656 (1968)
Published by Company of Biologists 1968

Some Features of the Central Co-Ordination of a Fast Movement in the Crayfish

ALAN ROBERTS ¹

¹ Neurosciences Department, University of California San Diego, La Jolla, California; Zoology Department, University of Bristol

(i) The nervous and muscular activity pattern produced in an abdominal segment by a single giant-fibre impulse when all peripheral reflexes are abolished is described.

(ii) This description depends on criteria for the identification of efferent neurones to the tail muscles. These are discussed and the identification of the inhibitor to the fast flexor muscles is established by anatomical homology.

(iii) The pattern of response to a giant-fibre impulse is summarized in Fig. 4.

(iv) Inhibition of the fast flexors, the lack of an extension command, the slow flexor contraction, the accessory neurone discharge and central nervous inhibition during the escape movement are among the features discussed.

Note:

Partly supported by a U.S. Public Health Service Cardiovascular traineeship in the Zoology Department, University of California Los Angeles.