. Anatomy, descriptive and applied. Anatomy. THE RETINA, OR TUNICA INTERNA 1103 7. The outer nuclear or outer granular layer, like the inner nuclear layer, contains several strata of clear oval nuclear bodies; they are of two kinds, and on account of their being respec- tively connected with the rods and cones of Jacob's membrane (rod fibres and cone fibres) are named rod granules and cone granules. The rod granules are much the more numerous, and are jjlaced at different levels throufihout the layer. Their nuclei present a peculiar cross-striped appearance, and prolonged from either extremity
. Anatomy, descriptive and applied. Anatomy. THE RETINA, OR TUNICA INTERNA 1103 7. The outer nuclear or outer granular layer, like the inner nuclear layer, contains several strata of clear oval nuclear bodies; they are of two kinds, and on account of their being respec- tively connected with the rods and cones of Jacob's membrane (rod fibres and cone fibres) are named rod granules and cone granules. The rod granules are much the more numerous, and are jjlaced at different levels throufihout the layer. Their nuclei present a peculiar cross-striped appearance, and prolonged from either extremity of the granule isa fine process; the outer process is continuous with a single rod of Jacob's membrane; the inner passes inward toward the outer -Jio plexiform layer and terminates in an I 4,7 it. enlarged extremity, and is embedded X) in the tuft into which the outer pro- cess of the rod bipolars break up. In its course it presents numerous varicosities. The cone granules, fewer in number than the rod gran- ules, are placed close to the mem- brana limitans externa, througl which they are continuous with th: cones of Jacob's membrane. Thej^ do not present any cross-striping, but contain a pyriforra nucleus which almost completely fills the cell. From their inner extremity a thick process passes inward to the outer plexiform layer, upon which it rests by a somewhat pyramidal enlargement, from which are given External segment Intermediary (Use- ElUptoid- Myoid-— ^^ ' ' * Fig. 822.—Cones in the different regions of the retina. 7. Near the era serrata. 11. At 3 mm. from the ora serrata. ///. At an equal distance from the ora serrata and the papilla. IV. At the periphery of the fovea centralis. V. In the fovea centralis. VI. Fig. 821.—The cells of the rods of the At the centre of the fovea centralis. E. Length of the external retina in the frog. A. Red rod. B. Green segment. /. Length of the internal segment. D. Diameter of rod. (Poirier and Charpy.) the internal segment
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
