Human anatomy, including structure and development and practical considerations . s of the cone visual cells, are broaderthan the corresponding parts of the rods and are continued through the outer nuclearlayer as far as the outer portion of the external plexiform layer, where they end witha broad base, from which delicate processes extend inward to interlace with theterminal arborizations of the cone-bipolars. The outer nuclear layer is about .05mm. in thickness. The outer plexiform layer is a narrow granular looking stratum, between theouter and the inner nuclear laver, and constitutes the f
Human anatomy, including structure and development and practical considerations . s of the cone visual cells, are broaderthan the corresponding parts of the rods and are continued through the outer nuclearlayer as far as the outer portion of the external plexiform layer, where they end witha broad base, from which delicate processes extend inward to interlace with theterminal arborizations of the cone-bipolars. The outer nuclear layer is about .05mm. in thickness. The outer plexiform layer is a narrow granular looking stratum, between theouter and the inner nuclear laver, and constitutes the first of the cerebral layersof the retina. It is composed of the dendritic arborizations of the bipolar nerve-cellsof the succeeding layer, which lie in close relation with the centrally directed proces-ses from the foot-plates of the cone-cells and with the end-knobs of the addition to these constituents of the plexiform layer, numerous fibres arising fromthe protoplasmic processes of the horizontal cells of the inner nuclear layer also takepart in its Pigment layerSection of human retina from near posterior pole. X 230. THK NERVOUS TUNIC. 1465 Fig. 1221. The inner nuclear layer, the most compHcated of the retinal strata, mm. in thickness near the optic disc. It contains nervous elements of threemain t\pes—the horizontal cells, the bipolar cells, and the amacrine cells—and,associated with these, the nuclei of the sustcntaciilar cells. The horizontal cells form the external layer, and were formerly included in theouter layer. They have flattened cell-bodies and send out from five toseven dendrites, which divide into innumerable branches and, passing- into the layer, terminate in close association with the bases of the rod and conevisual cells. Each horizontal cell possesses also an axone, which is directed outwardthrough the outer plexiform layer, and ends in a richly branched arborization aboutthe visual cell
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