Abstract
1. 1. Mechanisms involved in ERG cireadian rhythm synchronization were studied. 2. 2. Functional communication between the 6th abdominal ganglion photoreceptors and some structures involved in the ERG circadian rhythm, i.e. the visual photoreceptors and the shielding pigmentary cells, was analyzed. 3. 3. Spontaneous and evoked light potentials in the abdominal chain showed differences depending on day hour with maxima by night. 4. 4. Reduction induced by photostimulation of the 6th abdominal ganglion upon visual photoreceptors activity and shielding pigments position, was also maximum by night. 5. 5. Our results support an anatomical-funtional relationship between the caudal photoreceptors and visual photoreceptors, related to ERG circadian rhythm synchronization and involving the distal pigment dispersing hormone released from the sinus gland.
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