The hyaloid canal and its relation to cyclitic exudation / by Angus M'Gillivray.

  • MacGillivray, Angus.
Date:
1898
Catalogue details

Licence: Public Domain Mark

Credit: The hyaloid canal and its relation to cyclitic exudation / by Angus M'Gillivray. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    IVM the Author^s Compli?nenis. Reprinted from The Scottish Medical Surgical Jourtial, October 1898. THE HYALOID CANAL AND ITS RELATION TO CYCLITIC EXUDATION! By ANGUS M‘GILLIVRAY, C.M., M.D., F.R.S.Ed., Lecturer on Ophthalmology, University College, Dundee, St Andrews Uni- versity ; Ophthalmic Surgeon, Dundee Royal Infirmary ; Surgeon, Dun- dee Eye Institution ; and Ophthalmic Surgeon, Dundee Institution for the Blind In foetal life the hyaloid canal and artery play an important part in the nutrition and development of the eyeball. The artery makes its appearance at a very early stage in the de- velopment of the mammalian eye, and is, comparatively speak- ing, of considerable size owing to its extensive and important distribution. It is the continuation of the central artery of the retina, which in adult life occupies the axial area of the distal portion of the optic nerve, and passes forwards to near the posterior pole of the lens, where it divides into numerous small branches, forming a vascular network—membrana capsularis— enveloping the entire lens. The anterior portion of this vas- cular network, which corresponds to the pupillary area— membrana pupillaris—is supplemented by arterial branches from the vessels of the anterior surface of the iris. The central and hyaloid arteries gain access to the interior of the optic nerve and eyeball respectively through the so-called choroidal fissure, situated along the ventral surface of the optic vesicle. This fissure is a continuation backwards of the distal or lenticular invagination of the primary optic vesicle, and is prolonged into the optic pedicle for a short distance, thus con- verting the originally tubular pedicle into a more or less solid structure grooved longitudinally along its ventral surface. Into this groove the central artery of the retina is prolonged forward till it reaches the interior of the secondary optic vesicle, where it gives off the retinal arteries, which we see with the ophthalmoscope. The continuation of the artery from the point where the retinal arteries are given off to the posterior pole of the lens is called the hyaloid or central artery of the vitreous. The groove along the ventral surface of the optic pedicle and the choroidal fissure eventually become obliterated, the former by its margins growing round the central artery of the retina, and the latter by simple approximation and coales- cence of its margins. 1 Read before the Section of Ophthalmology, British Medical Association, Edin- burgh, August 28, 1898.