. Kirkes' handbook of physiology . Fig. -Distribution of the Rods and Cones. A, In the peripheral part of the retina;B, from the region of the macula lutea. In man and mammals the number of rod cells are much greater than the cones,but it is said that in birds cones predominate. Even in man the center of thefovea centralis is devoid of rods and consists of cones only, figure 450. All the elements of the retina are sustained and isolated by large cellslying vertically which are known as the fibers of Mutter. The nucleus of thefiber of Miiller is found at the level of the internal granular
. Kirkes' handbook of physiology . Fig. -Distribution of the Rods and Cones. A, In the peripheral part of the retina;B, from the region of the macula lutea. In man and mammals the number of rod cells are much greater than the cones,but it is said that in birds cones predominate. Even in man the center of thefovea centralis is devoid of rods and consists of cones only, figure 450. All the elements of the retina are sustained and isolated by large cellslying vertically which are known as the fibers of Mutter. The nucleus of thefiber of Miiller is found at the level of the internal granular layer, and thetwo extremities of the protoplasm or cell body are condensed in two homo-geneous layers, known as the external and the internal limiting layer. Theexternal limiting layer is placed just between the two segments of the rodand cone cells. The internal limiting layer is situated upon the internalsurface of the retina. At the ora serrata the layers are not perfect and disappear in this order:nerve fibers and ganglion ce
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