1. A circuit that produces a 70-100 ms IPSP in the crayfish giant motoneuron is described.
The IPSP is produced by a disynaptic pathway from the nongiant fast flexor motoneurons to …

METHODS Crayfish(P1-ocambarus clarltii) were maintained and prepared for experiments
as described in the first paper in this series (28). The abdomen was pinned ventral side up in …

The crayfish abdomen contains separate slow and fast neuromuscular systems that mediate
posture and escape tailflips. It was recently demonstrated that impulses in the medial and …

1. Crayfish giant fibers are generally believed to generate tailflip movements by means of
direct connections to two classes of phasic flexor muscle motoneurons, the motor giants …

Abstract Professor Cornelis Wiersma, whom we honor in this volume, introduced the giant
fiber system of the crayfish (Johnson, 1924) into modern neurophysiology in an important …

Crayfish possess two pairs of giant axons that travel the length of the central nervous
system. The giant cells are command neurons, which produce, with a single impulse, a …

Intracellular recordings from neuronal somata and extracellular recordings from peripheral
nerves were used to study the effects of impulses in the giant escape command interneurons …

1. The giant command neurons for tailflip escape behavior in crayfish have been thought to
excite the nongiant fast flexor (tailflip producing) motor neurons (FFs) via monosynaptic …

Stereotyped responses were evoked in a number of motoneurones in the appendages of
semi-intact crayfish when the command neurones for escape behaviour were activated. The …

The neural circuitry that is responsible for the escape behavior of crayfish has been a
favorite object of study for neurobiologists ever since Weirsma first showed, about half a …