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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    mina cribrosa, as has been represented; but it is obvious that they are altogether continuous, with¬ out any line of separation between them. The lamina cribrosa, as it is called, has the same white colour as the nerve, without any of the dark tinge of the surrounding sclerotic, and, if compared with a section of the nerve at some distance from the eye, is found to present exactly the same appear¬ ance. If the optic nerve be forcibly compressed, the medullary matter is forced through these ori¬ fices at its extremity in the bottom of the eye in vermicular coils, as the sebaceous matter is forced from the follicles in certain parts of the skin ^ a similar appearance is produced upon the cut ex¬ tremity of any part of that portion of the nerve which is external to the cavity of the scull. After death, especially if the parts be placed for some time in water, the medullary matter of the nerve is projected in the form of a button or tuft in the bottom of the eye ; an appearance arising either from the contraction of the firmer part or neurilcma upon the medullary portion, or from the medullary matter imbibing the water, and thus becoming too large in quantity for the unyielding structure within which it is enclosed: at the same time, a similar tuft or button presents itself at the cut extremity of the nerve. This button or projection has been noticed by most anatomists in their descriptions of the organ, and is represented in a remarkable man¬ ner by Soemmering, in his enlarged outline section of the eye j but I think the explanation now given
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