. Kirkes' handbook of physiology . he lids. The conjunctiva, or lining membrane of the lids, which is reflected on tothe free surface of the eyeball, protects the eye from injury by its extraor-dinary sensitiveness to irritation by dust or other external substance. Itsstimulation produces reflex secretion of the lachrymal fluid that flows overthe surface of the eye, and tends to wash away the stimulating substance. The Eyeball and its Parts. The detail of the structure of the eye-ball is too complex to be given here except in so far as seems necessary for aclearer presentation of the physiolog
. Kirkes' handbook of physiology . he lids. The conjunctiva, or lining membrane of the lids, which is reflected on tothe free surface of the eyeball, protects the eye from injury by its extraor-dinary sensitiveness to irritation by dust or other external substance. Itsstimulation produces reflex secretion of the lachrymal fluid that flows overthe surface of the eye, and tends to wash away the stimulating substance. The Eyeball and its Parts. The detail of the structure of the eye-ball is too complex to be given here except in so far as seems necessary for aclearer presentation of the physiological facts. A gross dissection reveals THE CORNEA 631 the tough, white, sclerotic coat; the intermediate thin, vascular, pigmentedchoroid coat; and the inner nervous coat, the retina. The section also shows that the eyeball is specialized in structure in itsanterior region and that its contained cavity is divided into two parts, viz., Canal of 8ch]emraSuspensory llga: Anterior chamber Posterior chamberCiliary processCanal of Petit. Fig. 441.—Section of the Eyeball. the anterior and posterior chambers are filled with the transparent aqueousfluid. This fluid is like lymph in its composition. The vitreous chamberbetween the lens and the retina is filled with the clear jelly-like vitreoussubstance. The Cornea. The sclerotic coat is continuous with the cornea infront of the eyeball, but the cornea is transparent and its radius of curvature
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