. Cunningham's Text-book of anatomy. Anatomy. 816 THE OKGANS OF SENSE. ganglionic layer; a few are centrifugal and end in branched clubbed extremities in the inner molecular or inner nuclear layers of the Fig. 688.—Perpendicular Sections op Mammalian Retina (Cajal). A, Layer of rods and cones ; B, Outer nuclear layer ; C, Outer molecular layer ; D, Inner nuclear layer ; E, Inner molecular layer ; F, Ganglionic layer ; G, Stratum opticum ; r, rods ; c, cones, , rod granules ; eg, cone granules ; , rod bipolars ; , cone bipolars ; , contact of rod bipolars with the spherules
. Cunningham's Text-book of anatomy. Anatomy. 816 THE OKGANS OF SENSE. ganglionic layer; a few are centrifugal and end in branched clubbed extremities in the inner molecular or inner nuclear layers of the Fig. 688.—Perpendicular Sections op Mammalian Retina (Cajal). A, Layer of rods and cones ; B, Outer nuclear layer ; C, Outer molecular layer ; D, Inner nuclear layer ; E, Inner molecular layer ; F, Ganglionic layer ; G, Stratum opticum ; r, rods ; c, cones, , rod granules ; eg, cone granules ; , rod bipolars ; , cone bipolars ; , contact of rod bipolars with the spherules of the rod fibres ; c. c, contact of cone bipolars with the branches of the cone fibres ; ar, internal arborisation of cone bipolars ; ar, internal arborisation of rod bipolars ; , centrifugal nerve fibre ; h, horizontal cells; , stratified spongioblasts ; , diffuse spongioblasts; , stratified ganglion cell ; M, Sustentacular fibre. 2. Ganglionic or nerve-cell layer.—The cells of this stratum vary in size, are oval or piriform in shape, and form a single layer, except at the macula lutea, where several strata are present. Each cell contains a large nucleus, and gives off, from its inner surface, an axon which is continued as a fibre of the stratum opticum. From the outer surface of each cell numerous dendrites arise, which form arborisations in the inner molecular layer. The cells may be divided into uni- stratified, nrulti-stratified, and diffuse, according as their den- drites ramify in one or in several strata of the inner molecular layer, or extend throughout nearly its whole thickness. 3. Inner molecular or inner plexiform layer.—This is constituted chiefly by the interlacement of the dendritic arborisations of the cells of the ganglionic layer with those of the inner nuclear layer, and has been divided by Ramon y Cajal into five strata. It sometimes contains horizontal cells (spongio- blasts), whose branched processes ramify in it. 4. Inner nuclear laye
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