Efferent controls in crustacean mechanoreceptors.
Microsc. Res. Tech.. 2002-08-15; 58(4): 312-324
DOI: 10.1002/jemt.10139
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1. Microsc Res Tech. 2002 Aug 15;58(4):312-24.
Efferent controls in crustacean mechanoreceptors.
Cattaert D(1), Le Bon M, Le Ray D.
Author information:
(1)Laboratoire de Neurobiologie des Réseaux, LNR, UMR 5816, CNRS, Université de
Bordeaux 1, Biologie Animale, 33405 Talence, France.
Since the 1960s it has been known that central neural networks can elaborate
motor patterns in the absence of any sensory feedback. However, sensory and
neuromodulatory inputs allow the animal to adapt the motor command to the actual
mechanical configuration or changing needs. Many studies in invertebrates,
particularly in crustacea, have described several mechanisms of sensory-motor
integration and have shown that part of this integration was supported by the
efferent control of the mechanosensory neurons themselves. In this article, we
review the findings that support such an efferent control of mechanosensory
neurons in crustacea. Various types of crustacean proprioceptors feeding
information about joint movements and strains to central neural networks are
considered, together with evidence of efferent controls exerted on their sensory
neurons. These efferent controls comprise (1) the neurohormonal modulation of the
coding properties of sensory neurons by bioamines and peptides; (2) the
presynaptic inhibition of sensory neurons by GABA, glutamate and histamine; and
(3) the long-term potentiation of sensory-motor synapses by glutamate. Several of
these mechanisms can coexist on the same sensory neuron, and the functional
significance of such multiple modulations is discussed.
Copyright 2002 Wiley-Liss, Inc.
DOI: 10.1002/jemt.10139
PMID: 12214298 [Indexed for MEDLINE]