The lymphatics of the walls of the larger blood-vessels and lymphatics / by George Hoggan and Frances Elizabeth Hoggan.

  • Hoggan, George.
Date:
[1882]
Catalogue details

Licence: Public Domain Mark

Credit: The lymphatics of the walls of the larger blood-vessels and lymphatics / by George Hoggan and Frances Elizabeth Hoggan. 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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    found on page 543 of the third edition of his Principles of Surgery. Professor Sliller Scays of such ligatured vessels :— Plastic exudation is not limited to within the vessel. It occurs, and more extensively, on its exterior, forming a dense swelling of some size, within which the ligature's noose is deeply em- bedded. The highly important, and even essential character, of this external exudation of plastic fibrin is fully elucidated by the experiments of Mr. Spence, from whose unpublished drawings the illustrations herewith given are derived. He has shown clearly that the internal clot, so far from being, as was supposed by Manec and others, essential to the separation of the ligature without haemorrhage, is not unfrequently wanting when the vessel has been successfully tied, the closure being entirely effected in these cases by the plastic exudation between the cut edges of the internal coats and by the bulky fibrinous mass within and around the sheath. It is this external exudation which, becoming vascularised, forms the medium whereby blood is supplied from all the surrounding parts to the important new formations within the external coat of the occluded vessel; and which, by its equable pressure upon the divided ends of the internal coats, prevents the tender adhesions within the sheath from being broken up, even when there is no coagulum. According to Mr. Spence, the vessels of the new plastic lymph are formed with great rapidity. In one instance, in the dog, he found them present in considerable numbers sixty hours after the operation. After a longer time, vessels begin to pass even into the clot when this is present; these vessels being always in connection with those of the sheaths and external lymph, and not proceeding, as has been supposed, from the interior of the artery. Comment on the above description, given for the sake of comparison with the facts which we have discovered, is scarcely necessary. The lymphatics which we have described as rami- fying in what is called the outer portion of the middle coat would be completely ruptured in satisfactory tying, leading to the effusion of their contained lymph only where it has been described as lying. Indeed, the facts being as we have described them, the consequences could not well be otherwise; and the subsequent direction of vascularisation only tends to confirm