Abstract
Retinal projections to the basal forebrain in male Syrian hamsters were examined at the ultrastructural level following bilateral intraocular injections of horseradish peroxidase conjugated to either cholera toxin (CT-HRP) or wheat germ agglutinin (WGA-HRP). Light level microscopic analysis confirmed retinal projections along basal telencephalon, and examination on the electron microscope of individual fibers from the peri-amygdaloid area revealed en passant synaptic profiles. Sections from animals treated with WGA-HRP showed evidence of transsynaptic communication in the form of labeled dendrites in the peri-amygdaloid area. Taken together, these data show that the retina communicates directly with the periamygdaloid area, where photic and chemosensory information may be integrated to modulate reproductive behavior.
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