. Human physiology (Volume 1) . GAN OF VISION. 185 ciliary processes. Ribes, indeed, derives it from the vitreous hu-mour. Howsoever secreted, it is very rapidly regenerated whenevacuated; as it must be in every operation for cataract by ex-traction. It is not lodged in cells, and hence readily flows outwhen the cornea is punctured. The quantity of aqueous humour,in the adult, is about five or six grains. Its specific gravity is notrigorously established, but it differs slightly from that of water, beinga little greater. According to Berzelins, it is composed of water,98-10 ; a little albumen
. Human physiology (Volume 1) . GAN OF VISION. 185 ciliary processes. Ribes, indeed, derives it from the vitreous hu-mour. Howsoever secreted, it is very rapidly regenerated whenevacuated; as it must be in every operation for cataract by ex-traction. It is not lodged in cells, and hence readily flows outwhen the cornea is punctured. The quantity of aqueous humour,in the adult, is about five or six grains. Its specific gravity is notrigorously established, but it differs slightly from that of water, beinga little greater. According to Berzelins, it is composed of water,98-10 ; a little albumen ; muriates and lactates, 1-15 ; soda, with asubstance soluble in water, 0* The crystallinelens is a small body, F\g. 34. of a crystalline ap-pearance, and lenti-cular shape, whenceits name. It mea-sures in the adult,about 1-33 of an inchin its greatest cir-cumference ; and isabout 2\ lines thickat its centre. It issituate between theaqueous and vitreoushumours, and atabout one-third ofthe antero-posteriordiameter of the or-. Longltudinal Section of the Globe of the Eye. 1. Sclerotic, thicker behind than in front. 2. Cornea, receded within anterior margin of sclerotic, and connected with it by g^n A Hpnrp«s<?inn means of a bevelled edge. 3. Choroid, connected anteriorly within. n. ucpcooiun, (4) ciliary ligament, and (5) ciliary processes. 6. Iris. 7. Third layer of eye, retina terminating anteriorly by abrupt bor-der at commencement of ciliary processes. 9. Canal of Petit, encir-cles the lens(12); the thin layer in front of this canal is the zonulaciliaris, a prolongation of vascular layer of retina to the lens. chamber of eye containing aqueous humour; lining mem-brane by which the humour is secreted is represented in Posterior chamber. 12. Lens, more convex behind than before,enclosed in its proper capsule. 13. Vitreous humour enclosed inhyaloid membrane, and in cells formed in its interior by thatmembrane. 14. Tubular sheath of hyaloi
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectphysiology, bookyear1
