Inquiries respecting the anatomy of the eye / [Arthur Jacob].

  • Arthur Jacob
Date:
1823
Catalogue details

Licence: Public Domain Mark

Credit: Inquiries respecting the anatomy of the eye / [Arthur Jacob]. Source: Wellcome Collection.

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    edge of the central opening. It is quite impossible for words to give an adequate idea of this appear¬ ance ; X have, therefore, caused a magnified draw¬ ing to be made from an excellent specimen ; which specimen, along with some other preparations, il¬ lustrating the subjects of the present communica¬ tion, I have presented to the Hunterian Museum, where they may be seen. (Vide PI. IX. Fig. 1.) If I ventured to compare the appearance which I de¬ scribe with any other with which we are acquainted, I should say that it resembled strongly the carnece columnce and cordw tendinece of the heart, both in form, arrangement, and irregularity of conforma¬ tion. This structure is more strongly marked in the hazel than the blue iris; and, in many cases, the fleshy projections coalesce, by which they appear less distinct; but the loops or cords which arise from them always exist, and often project so much from the plane of the iris, as to admit of having a small probe or bristle passed beneath them. That this appearance of the iris does not depend on any particular disposition of its vessels, is, I think, obvious; from the thick¬ ness of these stria?, or cords, being so much greater than the vessels of the iris; from their beinn* ar- ranged in a manner altogether different from vas¬ cular inosculation; and finally, because the iris, when successfully injected and expanded, does not present that interlacement of branches surrounding the pupil, which has so often been described from observation of it in its uninjected state. If the iris
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