It is well established that a proprioceptive organ in the walking legs of decapod Crustacea is able to influence not only the muscle of the joint where it is situated but also most of the other muscles of the same leg. Resistance reflexes elicited by several chordotonal organs have been described (Bush, 1962, 1965), and it has been demonstrated that one of them (the CB chordotonal organ) evokes a response in the main muscles of the same leg when it is passively stretched (or relaxed) (Clarac, Vedel & Bush, 1978). In addition to proximo-distal reflexes, such as CB proprioceptive action, disto-proximal controls also have been described. For example, an imposed mero-carpus (M-C) movement influences the discharge of the motoneurones which command the muscles of the thoracico-coxal (T-C) or of the coxo-basal (C-B) joint (Ayers & Davis, 1977; Vedel & Clarac, 1979). When...

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