Centrifugal innervation of the rat retina

Visual Neuroscience
M Schütte

Abstract

Centrifugal fibers innervating the retina have been shown in all classes of vertebrate, except for mammals where conventional tract-tracing methods have not been able to unmistakably demonstrate their existence. In a previous study, a unilateral, intravitreal injection of 5,7-dihydroxytryptamine was used to reveal indoleamine-accumulating centrifugal fibers which were visualized by an immunoreaction against serotonin. In the present study, I employed a modification of this method to stain retinopetal neurons in the rat. Terminals were located preferentially in the outer retina; labeled fibers could be traced back along an ipsilateral pathway to somata in the dorso-caudal portions of the chiasm or the medio-lateral preoptic area, and thence towards the suprachiasmatic nuclei. The unique beaded appearance of the fibers distinguishes them from retinal ganglion cell axons. The labeling of central cell bodies strongly suggests that they possess terminals in the retina. Thus, at least some mammalian retinas receive centrifugal innervation. This indoleamine-accumulating retinopetal pathway may be involved in retinal melatonin synthesis, coordination of circadian rhythms, and interocular phenomena.

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