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Cytoarchitectural analysis of the telencephalon in Serranus scriba fish enabled us to differentiate a rather specialized morphological structure. Nerve cells identified in this structures cannot be classified following classical categories met in higher vertebrates neither be related to the isodendritic type of nonspecialized neurons. A centripetal orientation of dendrites and exons from all regions to the striatum is clearly expressed. Numerical prevalence of large cells is remarkable for similar structures in mammals in their prenatal and postnatal ontogenesis.

Histochemical analysis of AMPS (AB-staining materials) in Serranus scriba brain showed its irregular distribution in different brain regions. The highest AMPS content was observed in the optocoele and ependymal cells lining it, above the marginal telencephalon and optic tectum as well as the molecular cerebellum layer. Particularly significant AMPS concentrations were noted in Purkinje cell regions. The telencephalon and optic tectum showed AB-negative-staining materials. Following histochemical changes during a 24 h period, AMPS concentrations were shown to follow circadian variations, especially in the Purkinje cell region. The highest AMPS content was noted during the morning and the lowest during the evening hours. The above changes were discussed in the context of the role of AMPS in neural functions.

The caudate nucleus has an inhibitory role (3, 14) in the integrational function of the central nervous system. Electrophysiological and behavioral signs of inhibition might be produced by low frequency stimulation of the caudate and blocked by natural or artificial arousing stimuli (4). The inhibitory effects integrate into the basic neural processes of excitation and inhibition which interact with the impulses reaching the central nervous system trhough the various sensory modalities (5, 8), and especially the visual system (2, 15). Inhibitory electrographical responses in the electroencephalogram elicited by caudate stimulation (“caudate spindle”) are blocked by the stimulation of the visual system. Similar relationships were observed in the other electrophysiological parameters as well (1, 15).