Abstract
1. The motor supply to the closer muscles of the snapper and pincer claws in alpheid shrimp was examined using electrical stimulation and recording techniques. Closer muscles of both claws are innervated by two excitatory and two inhibitory axons. Details of the relative distribution of the two excitatory axons to both sets of closer muscle fibers in each claw are similar. 3. Properties of synaptic transmission at the neuromuscular junction in the pincer claw resemble those in developing or regenerating muscle, with frequent failures and fluctuating ejp amplitudes. 4. We conclude that gross reorganization of claw motor innervation does not occur during the phenomenon of pincer-snapper transformation. Moreover the developmentally primitive state of neuromuscular transmission in the pincer provides a clue to possible control mechanisms in the transformation of the closer muscle.
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