Abstract

Publisher Summary This chapter gives a qualitative description to quantify receptor contacts and presents a topographical analysis of the network they form in the retina. It is shown that there are only two basic morphological types of horizontal cell in the cat retina. Their dendritic patterns differ. One, A-type, has no axon; the other, B-type, has an axon ending in a terminal system. There are about 2.5 more B- than A-type cells. The B-type axon connects to between 2000 and 3000 rods. Both cell types contact at least 80% of the cones in their dendritic field; therefore, 60% of the cones that a horizontal cell contacts are common to both classes of horizontal cell, and there is no strict selectivity of cone type. The coverage factor of the retina for the dendrites of both horizontal cell types is about 4, except in the central area where that of the B-type rises to 7.

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