Visual system of the @entity4576 ( @entity4576 ): II. The morphology associated with the multiple optic papillae and XXXX cell distribution.

@entity2479 @entity4576 @entity4494 @entity1829 @entity1274 @entity4616 @entity4037
The retinal organization associated with the multiple optic papillae of the catfish @entity4576 was examined. In each retina from ten to 17 papillae form an @entity4616 (which is wider dorsoventrally than mediolaterally). The dorsalmost papilla in this ring lies at the center of the retina. In addition, up to seven small papillae lie within the ring. Bundles of fibers leave the @entity1274 . These bundles remain separate as they pass through the distal portions of the neural retina and then merge before passing through the choroid. Bundles running through @entity1829 receive fibers from a roughly wedge-shaped retinal area; bundles running through @entity4037 receive fibers from a small area of central retina and a disproportionately large area of peripheral retina. A band of high @entity4494 cell density was observed extending between the nasal and temporal poles of the retina. No correlation was found between the retinal areas contributing fibers to the bundles of axons emerging from individual papillae and the areas of high cell density. Furthermore, no correlation was found between the average area of the @entity2479 cells and the @entity4494 cell density. From HRP preparations and axon counts we estimate that each retina of 95-mm catfish contains about 50,000 @entity4494 cells.
