Quain's elements of anatomy . ich the vessels of the retina branch. When examined during life by the aid of the ophthalmoscope, the optic discappears of a light grey tint, contrasting strongly with the colour of the rest ofthe field (see fig. 344). MICROSCOPIC STRUCTURE OF THE RETINA. WTien vertical sections of the retina, , sections made perpendicu-larly to its surface, are submitted to microscopic examination, eightdistinct strata are recognizable, together with certain fibrous structuresvshich pass vertically through the membrane and connect the severallayers. The following are the desi
Quain's elements of anatomy . ich the vessels of the retina branch. When examined during life by the aid of the ophthalmoscope, the optic discappears of a light grey tint, contrasting strongly with the colour of the rest ofthe field (see fig. 344). MICROSCOPIC STRUCTURE OF THE RETINA. WTien vertical sections of the retina, , sections made perpendicu-larly to its surface, are submitted to microscopic examination, eightdistinct strata are recognizable, together with certain fibrous structuresvshich pass vertically through the membrane and connect the severallayers. The following are the designations of the layers, from within out-wards 1. The layer of nerve-fibres (nerve-layer). 2. The layer of nerve-cells (ganglionic layer). 3. The inner molecular layer. 4. The inner nuclear layer. 410 THE EYE. 5. The outer molecular layer (internuclear). 6. The outer nuclear layer. 7. The layer of rods and cones (columnar layer). 8. The layer of hexagonal pigment cells (pigmentary layer). Fig. or choroidal TT^ 8. Layer of pigment cells. 7. Layer of rods and cones.• ? Membrana limitans externa. 6. Outer nuclear layer. 5. Outer molecular layer. 4. Inner nuclear layer. 3 Inner molecular layer. 1. Layer of nerve-fibres. . Membrana limitans interna. Inner surface. Fig. 346.—Diagrammatic section of the human retina (Sclmltze). In addition to these eight strata two very delicate membranes aredescribed—the one, memhrana limitans interna, bounding the retina onits inner surface, next to the hyaloid membrane of the vitreous humour ;the other, memdrana limitans externa, lying between the outer nuclearlayer and the layer of rods and cones ; but, as will be afterwardsexplained, these so-called membranes are merely the boundary linesof the sustentacular tissue of the retina. The accompanying figure,from Max Schultze, represents (somewhat diagrammatically) the generalarrangement and structure of the layers. The several layers of theretina will first be considered succ
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