Manual of pathological anatomy . Aneurism of the posteriortibial artery, with the nervespread over the back partof the pouch ; the sac isentirely obliterated by con-centric layers of tibr ne,growing paler towards thesurface. (St. Georges Museum,i\ 41.) STATISTICS OF ANEUEISiM. 385 rism, though apparently of exactly the same nature as that liningthe arteries, differs from it in not presenting any epithelium. Thisso-called membrane is in fact the condensed external layer of thecoagulum, similar to that which forms on the surface of old clots Fra. Section of tlie arch of an aorta, with an an
Manual of pathological anatomy . Aneurism of the posteriortibial artery, with the nervespread over the back partof the pouch ; the sac isentirely obliterated by con-centric layers of tibr ne,growing paler towards thesurface. (St. Georges Museum,i\ 41.) STATISTICS OF ANEUEISiM. 385 rism, though apparently of exactly the same nature as that liningthe arteries, differs from it in not presenting any epithelium. Thisso-called membrane is in fact the condensed external layer of thecoagulum, similar to that which forms on the surface of old clots Fra. Section of tlie arch of an aorta, with an aneurism arising from its upper part. Thecavity of the sac is nearly tilled by laminated coag-ulum, the internal membrane of theartery is thickened. The sac presses ag-ainst the trachea, the aiteria innominata, andthe right carotid and subclavian arteries. (St. Bartholomews Museum, Series xiii. No. 11.) in veins. It is not, properly speaking, organized. The coagulaform in proportion as the sac is cut off from the rest of the circu-lation ; the more shallow it is, and therefore the more exposed tothe force of the current, the less the liability to the formation offibrinous laminae, and the less, we may also add, the coincidentdanger of perforation of the coats of the vessel. It is through theagency of this deposit that a spontaneous cure may take place,either by an obliteration of the sac, or by pressure upon the artery,and consequent obliteration of its channel. The coagula maysubsequently undergo secondary metamorphoses, such as a conver-sion
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectanatomy, booksubjectp
