Term: type (a) narrow-field unistratified amacrine cell

Definition: The type (a) narrow field unistratified cell has previously been described by Perry (1979), and was called a type IV [collator note: retinal ganglion] cell. This type of cell can be found with its cell soma in either the ganglion cell layer or the inner nuclear layer. Unlike the other types of amacrine cell this type is found with its cell soma in the ganglion cell layer than in the inner nuclear layer. The dimensions of these cells (mean soma size 10.1 micrometers and mean dendritic field size 219 micrometers, from Perry (1979)) are the same in both layers. Examples of this cell type are shown in figure 3, plate 1, and figure 11.