On the development of the accommodative power of the human lens / by E. Treacher Collins.

  • Collins, E. Treacher (Edward Treacher), 1862-1937.
Date:
[1904]
Catalogue details

Licence: In copyright

Credit: On the development of the accommodative power of the human lens / by E. Treacher Collins. Source: Wellcome Collection.

Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)

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    wliich by that time have become somewhat separated. The apex of these folds extends so far back along the side of the lens as to reach its posterior lateral parts. (PI. Ill, Fig. 1.) In the later growth of the eye both plicated and non- plicated parts of the ciliary body become separated away from the sides of the lens. The development of the anterior chamber, and consequent displacement backward of the lens, tends still further to draw the ciliary processes away from a level with its posterior surface to a level with its anterior surface. (PI. Ill, Fig. 2.) The final stage in the development of the ciliary body, and one which is not complete until some time after birth, consists in the lengthening out of the non-plicated part of the ciliary body, and the further displacement backwards of it and of the ora serrata away from the lens, (PI. IV, Figs. 1 and 2.) It will thus be seen that different portions of the ciliary body are in contact with the sides of the lens at different times, and that adhesions which form between them must originate at different times. The first to be formed are those passing between the anterior part of the lens capsule and the non-plicated part of the ciliary body, which as these structures grow apart become stretched out into the orbiculo-antero-capsular fibres of the suspensory ligament. Next in formation are the adhesions between the posterior part of the non-plicated part of the ciliary body, together with the ora serrata, and the posterior part of the lens capsule which later result in the orbiculo-posterio-capsular fibres. As the ciliary processes commence to form and grow, extending backwards between the rudimentary non-plicated part and side of the lens, they pass between the several bundles of the orbiculo-antero-capsular fibres, which latter come ultimately to lie in the valleys between the ciliary processes. While the ciliary procissjs lie in contact with tlic sides b 2