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Thelateral giant interneuron (LG) is aninterneuron in theabdominalnerve cord ofcrayfish,lobsters,shrimp of the orderDecapoda and their relatives in thecrustacean classMalacostraca. It is part of the system that controls a special kind ofescape reflex of these organisms known as the "caridoid escape reaction."[1]
When thesensory hairs of thetail fan of crayfish are stimulated, the LG activates themotor neurons that control flexion movements of theabdomen in a way that propels the crayfish away from the source of the stimulation. The LG bypasses the main neural system that controls locomotion, thus shortening thereaction time.
The lateral giant connection to motor giant fast flexor neurons was the first known example of anelectrical synapse (Furshpan & Potter 1957).
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