Term: horizontal cell

Definition: Lucifer-Yellow injections in rat and gerbil retinae revelead only one type of horizontal cell, which resembles the B-type cells of cat and rabbit (Figs 5 and 6). They have a relatively densely branched, approximatively circular dendritic tree with several fine-primary dendrites. The dendrites carry single terminals or small aggregates of terminals which are all in the same place and thus presumably contac cones. On all-well filled individuals an axon is found. Axons commonly originate at a dendrite, are up to 300 micrometers long, and expand into profusely branched axon terminal systems which are densely covered with terminals. These terminals end on various planes and thus presumably contact rods. Horizontal cell soma diameters are 11-14 micrometers in rat.