Retina

(rel'-in-a/i). The chief and e ential peripheral organ of vision, the third or internal coat or membrane of the eye, made up of the end organs or expansion of the optic nerve within the globe. It is composed of ten layers from without inward, as follows: 1. Pigment-cells. 2. Rods and 1, 1. Layer of rods and cones. 2 Rods. 3. Cones. 4. Upper portion of rods. tion. 6. Point por of S. Lower union parts. of these two 7, 7. Two cells of the granular layer. S, 8. of Two cells the other same layer.other 9, 9. cells Still two of the same of the la layer. 10. Cell gr iv 'natter with which tnnnicate 11. 12. Other cells of the granu'ar layer. 13 Tripolar cell with which these are continuous. other lay uous con tin with the it A rod elements of the Proce 1' v tiicatesw which it cotnnuiof t h e external 16. Proci graintlai which!l co tn m u n icates with a cell of the by lar layer. granuco in in 11 11 icates Elements of thk Retina. with the laverot which layer. Proce from the last entering into the fibrous A radiating fiber of Miiller. 20. Conoid swelling by which this fiber is attached to the internal limiting I cone continuous with the other elements oi the 1 Cell of external granular layer. 23 Intermedia! between two cells of the granular layer. 24 Pn meting a cell of the granular layer with a cell ol the la of gray matter. 25. Proce of cell of layer of gray m A radiating fiber..'. External granular. 3. External limiting. cones. 7. Internal granular. 5, Outer molecular. 9. Nerve-fib 8. Ganglionic. nal molecular. R., Central Artery of, a bi Internal limiting. of the ophthalmic artery that pierces the optic in the orbit, branching 'within the globe, and Coarctate, a term used to desi ing the retina. the morbid condition caused by an effusion of liquid between the retina and the choroid. R., Detachment of, disconnection from the choroid. R., Epilepsy of, a symptom of migraine or of epilepsy, characterized by transient lo of sight. R., Fovea central is of. See Fovea . R., Leopard or Tiger, i, i. Layer of rods and cones, a. Rods. 3 Cones. 4, limitans extern a, s, 5. Outer and inner granular layers. 6. Outer granular layer. 7. Inter-granular c. Inner granular layer. 9. Layer of gray matter. 10. Granular portion of this layer. 11. Cellular portion. Fibrous layer. intern a. 14, 14. Radiating fibers inserted into this membrane. Vertical Section of the Retina.