Term: retinal ganglion cell A2

Definition: Alpha ganglion cells, which were defined by Peichl (1989), were identified and termed RGA2 in the present study (see Table 1). The RGA2 cell has a large soma from which a thick axon emerges. Four to eight stout primary dendrites project radially from the cell body and branch repeatedly in a Y-shaped pattern. The dendrites branch at regular intervals, with the first branch point being within half of a soma diameter of the cell body. This branching pattern gives the appearance of a relatively uniform, medium density of dendrites across the dendritic arbor. The cell body is usually situated at the centre of the dendritic field. They stratify at ... 72 ± 15% of the IPL (inner) or 34 ± 10% of the IPL (outer). RGA2 cells had a round soma and 4 to 7 primary dendrites that branch repeatedly proximal to the soma. In contrast to the RGA1 cells, RGA2 cells have many more dendrites surrounding the soma (Fig. 3B).