Publication: Morphological and physiological bases of crayfish local circuit neurones
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Date
1994
Authors
Nagayama, T. ; Namba, H. ; Aonuma, H.
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Publisher
Murcia : F. Hernández
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DOI
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info:eu-repo/semantics/article
Description
Abstract
As the subject of neuroethological studies,
arthropods offer several advantages to elucidate the
neural processes that generate and control behavioural
acts. The relative simplicity of their neural organization
and their identifiable neurones are particularly
advantageous. The crayfish, Procambarus clarkii,
uropods are paired appendages of the last abdominal
segment that show bilateral closing movement in
response to mechanical stimulation. This movement, the
avoidance «dart» response, is mediated by a cascade and
parallel organization of local circuit neurones in the
terminal abdominal ganglion. Thirty intersegmental
ascending interneurones and 20 spiking local
interneurones have been identified both morphologically
and physiologically. They receive exteroceptive inputs
directly from the sensory afferents. Two complementary
groups of unilateral nonspiking local interneurones have
also been functionally identified. They exert fine control
over the wide range of activity of motor neurones in a
graded and sustained manner. These nonspiking
intemeurones form opposing and parallel pathways that
are essential in modulating the pattern of movement of
the uropods.
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