. American journal of obstetrics and gynecology. l wall. During this process of swelling,which in many instances is quite enormous, they appear in differentstages and show a distinct change in staining reaction. Weigert-VanGieson stain is used. With the fiist swelling the elastica appears blackand this is gi-adually changed into a deep, port-wine red color, whichlater changes to a brick-red and then fades into a pale yellow. When SCHWARZ AND MC XALLEY : TTERIXK VESSELS DURING PREGNANCY 159 the pale yellow stage is reached, absorption takes place and the entirevessel wall disappears in due time
. American journal of obstetrics and gynecology. l wall. During this process of swelling,which in many instances is quite enormous, they appear in differentstages and show a distinct change in staining reaction. Weigert-VanGieson stain is used. With the fiist swelling the elastica appears blackand this is gi-adually changed into a deep, port-wine red color, whichlater changes to a brick-red and then fades into a pale yellow. When SCHWARZ AND MC XALLEY : TTERIXK VESSELS DURING PREGNANCY 159 the pale yellow stage is reached, absorption takes place and the entirevessel wall disappears in due time, provided that involution is these changes which Goodall describes as occurring before delivery,the degenerated elastica is frequently present as a yellow-staining, thick-ened band with here and there remains of the brick-red color. All stagesof transition from one color to the other are found. The changes in the veins arc briefly: A diffuse thickening of the en-tire wall, with a marked hyaline change in fibrous, elastic and muscle. Fig. 4.—Ob. Path. No. 2734. Haematoxylin-Eosin Stain. Thirty-six weeks piog-nant uterus. Shows a large artery with swollen intc;rnal elastic membrane aroumlentire vessel. This membrane stains yellow with Weigerts, showing its Normal vessels in some section stain well. It also shows in the upper por-tion a well developed intimal plaque. tissues; this degenerated tissue is absorbed during the process of involu-tion and the new vein wall is chiefly rebuilt by the proliferation of theremaining muscle cells of the media. If the hyaline material is not com-pletely absorbed, just as is the ease in subinvolution of the arteries, itis diffused throughout the vein wall, particularly near the peripherybetween the muscle fibers of the media and appears as black areas whenstained with Weigerts or Van Gieson stain. The black staining prop- 160 THE AMERICAN JOlRXAL OF OBSTETRICS AND GYNECOLOGY erty is due to tlie fact that the dea
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