On the development and abnormalities of the zonule of zinn / by E. Treacher Collins.

  • Collins, E. Treacher (Edward Treacher), 1862-1937.
Date:
[1892]
Catalogue details

Licence: Public Domain Mark

Credit: On the development and abnormalities of the zonule of zinn / 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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    [Bepriitted from the Rinjal Lotidon Ophthalmic Hospital Reporif, Vol. XIII, Fart 1.] ON THE DEVELOPMENT AND ABNOEMALITIES OE THE ZONULE OE ZINN. By E. Teeacher Collins, Curator of the Museum. Very little is known as to the development of the sus- pensoiy ligament of the lens or zonule of Zinn. Balfour* in his work on Comparative Embryology thus refers to it:— The development of the zonula of Zinn in mammalia, which ought to throw some light on the nature of the vitreous humour, has not been fully investigated. According to Lieberkiihn, this structure appears in half- grown embryos of the sheep and calf. He says, ' At the point where the ciliary processes and the ciliary part of the retina are entirely removed, one sees in the meridian bundles of fine fibres, which correspond to the valleys between the ciliaiy processes and fill them; also between these bundles there extend, as a thin layer, similar finely striated masses, and these would have been on the top of the ciliary processes.' He further states that these fibres may be traced to the anterior and posterior limb of the lens capsule, and that amongst them are numerous cells. KolUker confirms Lieberkiihn's statements. There can be httle doubt that the fibres of the zonule are of the nature of connective tissue; they are stated to be elastic. By Lowe they are believed to be developed out of the substance of the vitreous hamour, but this does not appear to me to follow from the observations hitherto made. It seems quite possible that they arise from mesoblast cells which have grown into the cavity of the vitreous humour ; solely in connection with their production. In the tenth edition of Quain's Anatomy,! we find:— The development of the hyaloid membrane has not been * Vol. ii, p. 495. t Vol. i, p. 87. b