. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. 936 THE SENSORY APPARATUSES. Fiff. 509. Layer of ganglion-cells. 4. Molecular layer. 5. Inner granular layer. 6. In- termediate layer. 7. Outer granular layer. 8. Outer limitary membrane. 9. Layer of rods and cones. 10. Pigmentary layer of the choroid, if this be attached to the retina, as Schultze proposes. It is to be remarked, that at the om serrafa all the nerve-elements of the retina disappear. Pigment Layer.—This is represented by a row of cells spread on the posterior face of the rod-and-cone stratum. The
. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. 936 THE SENSORY APPARATUSES. Fiff. 509. Layer of ganglion-cells. 4. Molecular layer. 5. Inner granular layer. 6. In- termediate layer. 7. Outer granular layer. 8. Outer limitary membrane. 9. Layer of rods and cones. 10. Pigmentary layer of the choroid, if this be attached to the retina, as Schultze proposes. It is to be remarked, that at the om serrafa all the nerve-elements of the retina disappear. Pigment Layer.—This is represented by a row of cells spread on the posterior face of the rod-and-cone stratum. These cells have many small prolongations, which are insinuated be- tween the rods and cones, and the elongated or rounded pigmentary granules of a more or less dark colour. (At the papilla conica, all the other elements than the nerve-fibres are entirely absent; hence this is presumed to be a " blind ;) Blood-vessels.—The retina possesses a particular vascular distribution. The arteria centralis retinm, with its vein, enters the optic nerve at a short distance from the globe, and with it passes into the eye; they traverse the papilla, and immediately divide into two branches, one of which is directed upwards, the other downwards. Close and fine anastomoses unite the vessels of the retina with the ciliary vessels at the back of the sclerotic. The distribution of the vessels in the different strata of the retina is variable. They are only found in the layer of nerve-fibres, in the retina of the Horse, Rabbit, and Guinea-pig ; but they are seen in all the layers—that of the rods excepted— of the retina of the other CAPILLARIES IN THE VASCULAR LAYER OF THE RETINA. THE MEDIA OP THE EYE. 1. The Crystalline Lens (Fig. 502,/). The lens, as its name imphes, is a (solid) transparent body, sustained at the smaller circumference of the zone formed by the ciliary processes (behind the pupil, and partially embedded in the vitreous humour). It is biconvex in sha
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