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Is one of the smallest ganglions of the body, and formed by the 5th and 3d pairs of encephalic nerves. It is situate at the outer side of the optic nerve near the bottom of the orbit; is irregularly quadrilateral and flat; its colour of a reddish gray. Behind, it communicates by its posterior angles-by means of nervous filaments-with the nasal nerve of the ophthalmic, the motor oculi, and offsets from the sympathetic. Each of its anterior angles furnishes a fasciculus of small nerves. These are the ciliary nerves.