Abstract
The ganglion cells of the cat retina form classes distinguishable in terms of perikaryal size, dendritic morphology and functional properties. Further, the axons differ in their diameters, patterns of chiasmatic crossing and in their central connections. Here we define, by 3H-thymidine autoradiography, the order of production of cells of each class and relate the order of the 'birthdates' to the known axonal pathways. The ganglion cell classes are produced in broad waves, which overlap as cells are produced first for central then for peripheral retina. Medium-sized cells are produced before the largest cells, and small ganglion cells are produced throughout the period of cell generation. This sequence of cell production relates to the orderly arrangement of axons in the optic tract, and can also be related to the rules of chiasmatic crossing observed for each ganglion cell class.
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