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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    membrcina papillaris is found in great perfection, extended across a very large pupil; the vessels pre¬ senting that singular looped arrangement (with a small irregular transparent portion in the centre) so well depicted by Wrisberg, Blumenbach, Albinus, Sdemmerring, Cloquet, and others. About the sixth month, it is equally perfect; the pupil is, however, smaller, the iris being more developed. Fig. 5. PI. IX. is a very faithful drawing from a specimen at this period. Subsequently to this date, the vessels begin to diminish in size and number, and a larger transparent portion occupies the centre. At the approach of the eighth month, a few vessels cross the pupil, or ramify through the membrane at a short distance from the margin; without at all pre¬ senting the looped appearance of the previous pe¬ riod, but admitting a free communication between the vessels of the opposite sides of the iris (see Fig. 6. PL IX). The pupil is now still more diminished in size, and the iris has assumed its characteristic coloured appearance; notwithstanding the absence of vessels, the membrane still preserves its inte¬ grity, though perfectly transparent. The period now approaches when it is to disappear; this occur¬ rence takes place, according to my observations, a short time previous or subsequent to birth. In every instance where I have made the examination, I have found the membrana pupillaris existing in a greater orless degree of perfection in the new-born infant; frequently perfect without the smallest breach, sometimes presenting ragged apertures in
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