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Cholinergic amacrine cells in the developing cat retina

Antiserum directed against the ACh‐synthesizing enzyme choline acetyltransferase (ChAT) was used to determine the development of cholinergic amacrine cell distributions in wholemounted kitten retinae. From birth (P0) two populations of cholinergic amacrine cells were immunolabelled; one population was located in the inner nuclear layer (INL) and the other was displaced to the ganglion cell layer (GCL). Dendrites from cholinergic amacrines in the INL stratified in the outer third of the inner plexiform layer (IPL), whilst those from displaced amacrines in the GCL stratified in the centre of the IPL. There was a centroperipheral gradient of development in both populations, and the total number of cholinergic amacrines in the GCL always exceeded that of the INL.