. Pathology and bacteriology [electronic resource]. Ophthalmology; Eye; Eye; Bacteriology; Ophthalmology; Eye; Bacteriology; Eye. ABNORMALITIES IN THE ARTERIA CENTRALIS RETINA 63 Little rounded bodies of steel grey colour, presenting a cyst-like appearance, are sometimes seen ophthalmoscopi- cally in front of and attached to the optic disc. They are probably cystic distentions of the sheath of the artery. Abnormalities in the Arteria Centralis Retinae. Cilio- retinal Vessels.—-It is only in mammals that blood-vessels are present in the retina and in the different species there are striking var
. Pathology and bacteriology [electronic resource]. Ophthalmology; Eye; Eye; Bacteriology; Ophthalmology; Eye; Bacteriology; Eye. ABNORMALITIES IN THE ARTERIA CENTRALIS RETINA 63 Little rounded bodies of steel grey colour, presenting a cyst-like appearance, are sometimes seen ophthalmoscopi- cally in front of and attached to the optic disc. They are probably cystic distentions of the sheath of the artery. Abnormalities in the Arteria Centralis Retinae. Cilio- retinal Vessels.—-It is only in mammals that blood-vessels are present in the retina and in the different species there are striking variations in their Fig. 37.—An eyeball the sight of which had been destroyed by ulceration of the cornea. Prolonged forward into the vitreous from the optic nerve is a tag of white membrane, which is due to a persistence of the central hyaloid artery. In some mammals the retina is devoid of blood-vessels. In some they come entirely from the ciliary blood-vessels in the sclerotic, and gain access to the retina at the margin of the optic disc, around which they curl. In others there is a mixed supply of blood-vessels, some coming, as just mentioned, from the ciliary vessels, and some from the central retinal vessels. In all primates the chief supply is the central retinal artery. In all the Leporidae^ what are called the retinal vessels are internal to the membrana limitans interna. 1 Lindsay Johnson. Philosoph. Trans, of the Royal Society of London, 1901, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Collins, E. Treacher (Edward Treacher), 1862-1937; Mayou, M. Stephen (Marmaduke Stephen), 1876-1934; Pyle, Walter L. (Walter Lytle), 1871-1921, editor; University College, London. Library Services. London : William Heinemann
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