A probationary essay on the formation of new blood-vessels : submitted, by the authority of the President and his Council, to the examination of the Royal College of Surgeons of Edinburgh, when candidate for admission into their body, in conformity to their regulations respecting the admission of ordinary Fellows / by Allen Thomson.

  • Thomson, Allen, 1809-1884.
Date:
[1832]
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Licence: Public Domain Mark

Credit: A probationary essay on the formation of new blood-vessels : submitted, by the authority of the President and his Council, to the examination of the Royal College of Surgeons of Edinburgh, when candidate for admission into their body, in conformity to their regulations respecting the admission of ordinary Fellows / by Allen Thomson. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

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    pletely enclosed in a mass of coagulated lymph some inches long. This lymph presented throughout its substance many red points which seemed to indicate so many new blood- vessels springing up in it. In a horse in which the right carotid had been tied with two ligatures an inch and a half separate, and the intervening portion of artery removed, Dr Ebel found, two months after the operation, the ends of the artery two inches from one ajiother, and surrounded with much dense lymph with which many small vessels were inter- woven. The ends of the artery were obliterated as far as the nearest considerable collateral branches, and adhered so firm- ly to the lymph that they could only be separated by the knife. Vessels originating from the lower end, and conse- quently passing through the lymph, proceeded to the neigh- bouring muscles ; they were unusually tortuous and sinuous, and communicated by open mouths with dilated collateral branches coming from the upper end of the carotid. Dr ScHffiNBERG ^, whose experiments were performed on goats by cutting through the carotids of both sides at inter- vals of some weeks, and immediately afterwards closing up the external wound, relates that he found, in examining a goat two months after the operation had been performed, the ends of the artery separated to a considerable distance from one another, and immersed in a dark coloured clot. The cellular texture on the outside of this clot was completely filled with a very fine network of vessels, (some of which might obviously give rise by their subsequent dilatation to the arches, of which mention has already been made;) and in the clot itself a tortuous and intricate network of vessels, between the obliterated ends of the artery, was filled with the injection mass, and carefully dissected out; it is obvious that these last (at least the part of them that was enclosed in tlie lymph) could only be regarded as vessels of new forma- tion. There seems then, to be every reason to believe, that ' Journal des Progres, vol. xii. 1828, p. 70.