Topography of a-type horizontal cells in the retina of the capybara

A-type horizontal cells inh retinal flat mounts obtained from capybaras and stained by the method of Gros-Schultze were examined for horizontal cell density distribution and dendritic field size. The total number of A-type horizontal cells was 69,316,76,667 and 79,524 in three retinae. The A-type horizontal cell distribution presented a visual streakk that parallels that observed in the ganglion cell distribution. A-type horizontal cell density decreased from the retinal center toward the periphery, whereas the dendritic field size increased toward the periphery. However, the coverage factor did not remain constaant along the retina