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. 1989 Mar;86(6):2061–2065. doi: 10.1073/pnas.86.6.2061

Retinal ganglion beta cells project transiently to the superior colliculus during development.

A S Ramoa 1, G Campbell 1, C J Shatz 1
PMCID: PMC286847  PMID: 2467298

Abstract

In adult cats, retinal ganglion cells of the beta class project almost exclusively to the lateral geniculate nucleus rather than to the superior colliculus (SC). We have examined whether this target specificity is present during early development. To identify ganglion cells that send axons to the SC in development, rhodamine-labeled microspheres were deposited in the SC at embryonic day (E) 38, E43, or postnatal day (P) 4. Retinae were then removed between E56 and P32 and kept alive in a tissue-slice chamber so that ganglion cells that had been retrogradely labeled with microspheres could be injected intracellularly with Lucifer yellow to reveal their morphological class. Many beta cells could be retrogradely labeled by microspheres injected into the SC at E38 or E43. They were indistinguishable from beta cells projecting to the lateral geniculate nucleus and were found even when a single injection was restricted to the caudal portion of the SC. In contrast, beta cells could not be retrogradely labeled by microspheres injected into the SC at P4. The disappearance of a beta-cell projection to the SC cannot be explained entirely by cell death since as late as P32, well after the major period of ganglion cell death, many beta ganglion cells labeled with microspheres at E38 were still present. These observations suggest that many beta cells initially extend an axon collateral to the SC that is subsequently lost some time after E43. Thus, to achieve the remarkable specificity present in the adult visual system, beta cells must withdraw axon collaterals from an entire target nucleus. Similar collateral elimination may give rise to the specificity of afferent connections in other sensory systems.

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