. The anatomy and physiology of the human body. Containing the anatomy of the bones, muscles, and joints; and the heart and arteries . ructure of the lens is quite pe-culiar, and resembles neither the vitreous nor the aqueoushumour. By maceration it splits into lamellae, and at the sametime bursts up into equal parts, so that there is first a stellated-like fissure, and then it separates into pretty regular divisions;and after maceration in acids, the lens can be teased out intominute shreds and fibres.* From it form, density, and central nucleus, it has greatpower of converging the rays of li
. The anatomy and physiology of the human body. Containing the anatomy of the bones, muscles, and joints; and the heart and arteries . ructure of the lens is quite pe-culiar, and resembles neither the vitreous nor the aqueoushumour. By maceration it splits into lamellae, and at the sametime bursts up into equal parts, so that there is first a stellated-like fissure, and then it separates into pretty regular divisions;and after maceration in acids, the lens can be teased out intominute shreds and fibres.* From it form, density, and central nucleus, it has greatpower of converging the rays of light; and in an eye properlyconstituted it concentrates them accurately to the surface ofthe retina. For this reason, it is placed before the vitreoushumour, and socketed in its anterior part. It is contained in acapsular membrane, the tunica aranea^ improperly called,|which membrane is continued from, or connected with, themembranes of the vitreous humour; but this is a subjectAvhich requires a more particular investigation. ©F THE CAPSULE OF THE LENS AND VITREOUS HUMOUR. Marginal Plate 2. Fig. 3. Petitian Canal. The Lens. Vitreous humour. In fig. 1. we have the appearance of the Petitian canal blownup. It is not found full of any fluid, it is only the laminae of * See further of the muscularity of the lerts,j Ophtkalmographtti. 50 OF THE HUMOURS OV THE EYE. membrane inflatctl, and it is best demonstrated when the eyeis slightly putrid by cutting olF the cornea, and with it a smallcircular portion of the sclerotica, and taking with these theiris also, \\hcn the lens presents itself seated ftrmly in its cap-sule on the vitreous humour. Now laying back the ciliary pro-cesses, we make a fine puncture with a lancet by the side ofthe lens, and then blow gently into it with the blowrpipc. Every anatomist acknowledges the existence of the Petitiancanal, and a distinct capsule to the lens is also pretty generallyallowed. But many deny that the vitreous membrane has two
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Keywords: ., bookcentury1800, bookidanatomyphysiolog, booksubjecthumananatomy
