[Retinal afferents of hypothalamic origin in a prosimian primate: Microcebus murinus. Study using retrograde...

The central efferent connections to the retina in Microcebus were identified using the retrograde axonal transport of fluorescent dyes. After unilateral intraocular injection of the tracer, two populations of labeled neurons were observed. Fluorescent neurons were located immediately posterior to the optic chiasma, in the anterior part of the arcuate nuclei. In addition, fluorescent neurons were observed in the suprachiasmatic nuclei; the latter pathway appears to close up an anatomical retino-hypothalamo-retinal loop between the suprachiasmatic nucleus and the retina.