Alpha ganglion cells, which were defined b … 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 to 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 and plusmn; 15% of the IPL (inner) or 34 and plusmn; 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). dendrites surrounding the soma (Fig. 3B).