Elementary anatomy and physiology Elementary anatomy and physiology : for colleges, academies, and other schools elementaryanato00hitc Year: 1869 374 HITCHCOCK'S ANATOMY 685. Humors of the Eye; Aq ucous— Of the three Hu- mors or liquid substances composing the eye, the Aqueous or watery is situated in the anterior portion of this organ behind the cornea, and in front of the crystalline humor soon to be described. It is a liquid like water, with an alkaline taste, and only a few drops in quantity. The Iris is placed directly in the middle of this fluid. 686. The Lens.—The Crystalline Lens or
Elementary anatomy and physiology Elementary anatomy and physiology : for colleges, academies, and other schools elementaryanato00hitc Year: 1869 374 HITCHCOCK'S ANATOMY 685. Humors of the Eye; Aq ucous— Of the three Hu- mors or liquid substances composing the eye, the Aqueous or watery is situated in the anterior portion of this organ behind the cornea, and in front of the crystalline humor soon to be described. It is a liquid like water, with an alkaline taste, and only a few drops in quantity. The Iris is placed directly in the middle of this fluid. 686. The Lens.—The Crystalline Lens or Humor (so called because it refracts light and is transparent like a crys- tal) is a double convex lens, the posterior convexity being Fig. 345. Fig. 346. Front View of the Crystalline Lens. Side View of the Lens. 1, Anterior Face. 2, Posterior Face. 3, Circumference. greater than the anterior, and is located directly behind the pupil, so that all the light which enters the eye, must pass through this and be refracted. This lens is made up of con- centric layers like an onion, and also of three triangular seg- ments, with their sharp edges directed towards the center, both of which structures, by boiling the lens in water for a short time, can be readily seen. Fig. 347 represents the difference in diameters Fig. 347. of the lens at different j, c d periods of life, a, rep- resents it at birth, b, at six years of age, c, its appearance in an adult, Crystalline Lens, a, At birth, b, At six years i * js. '± I 'U old. * c, Adult, d, Altered by alcohol. ancl alter it IiaS been 0
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