On the visible remains of the vitreous canal : with a report of cases / Burton Chance.

  • Chance, Burton Kollock, 1868-1965.
Date:
1907
Catalogue details

Licence: In copyright

Credit: On the visible remains of the vitreous canal : with a report of cases / Burton Chance. 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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    WITH A REPORT OF CASES * Burton Chance, M. D. Philadelphia. Some apology may be needed for speaking of.a subject so well known as that of the visible remains of the Canal of Cloquet. But for the past ten years it has been my good fortune to ob- serve several typical cases of these unusual vestiges. In hos- pital practice I have seen several instances a year, but of no special value. In my private practice liowevcr, I have had four cases which present typical features. An account of my observ^ations in these cases is the object of this paper. The Canal of Cloquet is the lymph channel found in the axis of the vitreous body. Besides transmitting the lymph it also gives passage to an artery, the hyaloid, which helps to form the vascular tunic of the lens. Between the fifth month and the seventh of human fetal life, this canal and its artery disappear, the obliteration beginnning at the posterior pole of the lens. In animals born blind the canal usually persists until the eighth or tenth day; while in certain animals, as the cow, all of the Ruminants, and a large number of the Rodents, it does not dis- appear. At times we find the canal with its artery, in whole or in part, remaining in Man, especially when the eye is imperfectly de- veloped, as in microphthalmic eyes. Schobl found them fre- quently in twins and in triplets, though they were lost again after a week or so. Lindsay Johnson found these rudiments in the Primates as well as in Man, and he has grouped their occurrence under three forms: I. A hollow trumpet-shaped tube with the base at the disk and free from blood, which we speak of as the visible remains of Cloquet’s Canal. ♦Read Before the Section on Ophthalmology, College of Physicians Philadelphia, Oct. 15, 1907.