Royal Society Publishing

Morphological Types of Horizontal Cell in the Retina of the Domestic Cat

B. B. Boycott, L. Peichl, H. Wassle


Two morphologically distinct types of horizontal cell are described from Golgi-stained whole mounts of the cat retina. They are referred to as A-type and B-type cells. The two types differ in their dendritic branching pattern, their overall size and the absence or presence of an axon. At every retinal position the dendrites of B-type cells branch more densely and overlap each other more frequently than do the dendrites of A-type cells. At equivalent retinal positions the dendritic field size of A-type cells is greater than that of B-type cells by a factor of about 1.5. Only B-type cells have an axon, which branches at the end into a large axon terminal system. The axons have no preferred direction of orientation. The stainability of horizontal cells by different Golgi methods is discussed.