has synaptic IO in region alpha retinal ganglion cell (Mmus) retinal ganglion cell A1 https://orcid.org/0000-0001-7258-9596 BAMS:1045 https://orcid.org/0000-0002-5260-9315 inner alpha retinal ganglion cell I-2 cell CL:0004120 A retinal ganglion A cell found in the retina with large somata, often polygonal in shape. The dendritic fields consist of three to seven stout dendrites that are sparce near soma. Dendrites terminate in S4. type I sublaminar layer S4