ABSTRACT
Immunochemical studies using a range of probes have been carried out on whole mounts of the radial nerve cord of the brittelestar Ophiura ophiura. Probes developed against GABA, Glycine, 5 HT, SALMFamide and RFamide were used. They show that there are discrete populations of each type of neurone and that these have a consistent pattern in each segment of the nerve cord. In the case of SALMFamide and RF-amide a single giant fibre with complex axon processes occurs in each segment and the shape of this neurone may be identical to a class of neurones that have been described from intra-cellular dyefills
