ISSN:
1432-1351
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Summary 1. The inhibition of near-field mechanosensory elements in crayfish was analyzed by intra- and extracellular recording. 2. In intact, restrained animals, inhibition of mechanosensory interneurons (MSIs) that respond to environmental water motion accompanies spontaneous, walking-like movements of the legs. Similar inhibition is seen when passive movements are imposed upon the legs. 3. Inhibition accompanying both active and passive movements is distributed to distant central targets by units that travel in a discrete central tract, here termed the ventro-medial bundle (VMB). 4. All MSIs encountered in this study were inhibited by VMB stimulation. In some, the inhibition was clearly postsynaptic, or a combination of pre- and postsynaptic mechanisms. In others, suppression of activity may be produced by inhibition that is exclusively presynaptic. 5. Of the four mechanosensory interneurons with known excitatory connections to the escape response command cell (the lateral giant), only one (Interneuron A) was clearly inhibited postsynaptically by VMB stimulation. Two of the remaining three MSIs in this circuit are also inhibited, but entirely presynaptically.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00619218
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