Neuronal Organization and Ontogeny in the Lobster Swimmeret System

General principles of neuronal organization and ontogeny in locomotor systems are explored, using the lobster swimmeret system as a model. Centrally, this motor system consists of command interneurones that activate segmental ganglionic oscillators that in turn drive the swimmeret motoneurones. Several sensory receptors excite the command interneurones, and in some cases the corresponding receptive fields have been mapped on the periphery. Swimmeret motoneurones are normally recruited in order of increasing size. The motoneurones follow this size principle also in their effects on muscles (smaller motoneurones have less effect) and in their normal discharge patterns (smaller motoneurones show less adaptation).

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