Archive image from page 467 of The development of the human. The development of the human body : a manual of human embryology . developmentofhum00mcmu Year: 1914 456 THE RETINA the ciliary region, forms the pigment layer of the retina (Fig. 272, p). The retinal layer increases in thickness and early becomes differen- tiated into two strata (Fig. 268), a thicker one lying next the pigment layer and containing numerous nuclei, and a thinner one containing no nuclei. The thinner layer, from its position and structure, suggests an homology with the marginal velum of the central nervous system, an
Archive image from page 467 of The development of the human. The development of the human body : a manual of human embryology . developmentofhum00mcmu Year: 1914 456 THE RETINA the ciliary region, forms the pigment layer of the retina (Fig. 272, p). The retinal layer increases in thickness and early becomes differen- tiated into two strata (Fig. 268), a thicker one lying next the pigment layer and containing numerous nuclei, and a thinner one containing no nuclei. The thinner layer, from its position and structure, suggests an homology with the marginal velum of the central nervous system, and probably becomes converted into the nerve-fiber layer '0&BoS' 00 0° o o o o Fig. 272.—Portion of a Transverse Section of the Retina of a New-born Rabbit. ch, Chorioid coat; g, ganglion-cell layer; r, outer layer of nuclei; p, pigment layer.— (Falchi.) of the adult retina, the axis-cylinder processes of the ganglion cells passing into it on their way to the optic nerve. The thicker layer similarly suggests a comparison with the mantle layer of the cord and brain, and in embryos of 38 mm. it becomes differentiated into two secondary layers (Fig. 272), that nearest the pigment layer if) consisting of smaller and more deeply staining nuclei, probably representing the rod and cone and bipolar cells of the adult retina,
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