Fibrous tissue formation in connection with the foetal vascular system and visible vessels on the surface of the iris / by E. Treacher Collins.

  • Collins, E. Treacher (Edward Treacher), 1862-1937
Date:
[1913]
Catalogue details

Licence: In copyright

Credit: Fibrous tissue formation in connection with the foetal vascular system and visible vessels on the surface of the iris / 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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    . tissue are most frequently met with in connection with the . central hyaloid artery of the vitreous, either as a dense ■ layer at the posterior surface of the lens, as one or more ^ white cords extending forwards through the vitreous from rthe region of the optic disc, or as a spur projecting u upwards into the vitreous from the region of foetal ocular 0cleft. In these masses or columns of fibi-ons tissue, blood- V vessels, patent and carrying blood, are usually present, lit has been customary to speak of such formations as atypical development of the vitreous humoui-, The general opinion of embryologists seems now to be that the vitreous humour is not mesoblastic but epiblastic lin origin. Salzmann (1), writing on this matter, says : The views of embryologists have undergone a significant change in the last decades with respect to the genesis of the vitreous. Previously the vitreous was held to be a mesodermal structure. Now, with a few exceptions, the :trend of the views is that the mesoderm forms only the vitreous vessels, that, however, the framework of the vitreous is of ectodermal origin. In respect to the finer details the views are still very much at variance; I, myself, have mainly followed the more intermediate views of Kolliker, von Szily, and Wolf rum. In a recent and lengthy investigation on the subject by Mawas and 'Magitot (2) the ectodermic origin of the vitreous body is ilso arrived at. The blood-vessels, which grow in at the foetal cleft, ippear then only to supply nutriment.to the developing ntreous, much as they supply nutriment to the developing ens during its most active period of growth. A formation of fibrous tissue in connection with these /essels cannot any longer be strictly described as atypical levelopment of the vitreous ; it will be better to ipeak of it in future as atypical development of the total vascular system. That this is the correct way to regard it is, moreover. Mown by the fact that formation of fibrous tissue of this ^cnption is not always confined to the vitreous chamber. I
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