Directions for making anatomical preparations : formed on the basis of Pole, Marjolin and Breschet, and including the new method of Mr. Swan / by Usher Parsons.

  • Parsons, Usher, 1788-1868.
Date:
1831
Catalogue details

Licence: Public Domain Mark

Credit: Directions for making anatomical preparations : formed on the basis of Pole, Marjolin and Breschet, and including the new method of Mr. Swan / by Usher Parsons. Source: Wellcome Collection.

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    It should be the object of the student to examine the muscles separately and in classes, according to their respec- tive offices; to study their situation and direction with respect to the arteries and nerves, and other parts that are concerned in surgery. Ifnot intended to be preserved, the muscles may after full dissection be removed, and the liga- ments and structure of the joints examined, before the bones are immersed for maceration. The student will hardly find it advantageous to make dry preparations of the muscles alone. They require as much attention, and are attended with as great expense, as when prepared with the blood-vessels, and unless he adopts the method of Mr. Swan hereafter described they will change in colour and size so much by drying, as to represent a recent dissection less satisfactorily than good plates. COMPARATIVE VALUE OF COLD AND WARM INJECTION. The comparative value of the two kinds of injection de- pends somewhat upon the kind of preparation intended to _ be made. For corroded’ preparations the cold injection is entirely unsuitable. For wet preparations it is immaterial which kind is used, excepting that the warm kind is attend- ed with loss of time and expense. For common dissec- tions, the cold injectionis in most respects preferable, not only © on account of the trouble and expense saved in heating the subject, and its not heating and crisping the aorta to the risk of its strength, but also for its withstanding the greatest heat of summer, when the warm kind is apt to liquify and ooze out from the orifices of divided branches. There is, however, a greater smoothness of the vessels that have been filled with the warm kind, which is pleasing to the eye of an anatomist. In respect to fineness, they will, either of them, if properly con- ducted, answer every purpose for surgical reference, though beyond this, I have found the cold injection succeed better than the warm, especially for filling vessels of the hol- low organs, and of the membranes of the large cavities. Therefore as respects utility and convenience I should, except for corroded preparations, prefer the cold injection.