In photosensory pineal organ, the functions of luminosity and chromatic signals and their afferent pathways.

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Pineal and parapineal ganglion cells projected on three areas of the mid-brain. Some terminals of them which reached at most dorsal area were contact the dendrites of giant neuron projecting to spinal cord. The pineal neurons extended deeper area of the brain than the parapineal. On the luminosity signal, it was demonstrated that the pineal complex took part in the locomotor activity rhythm, daily and circadian rhythms, in the far eastern brook lamprey.