Practical pathology; a manual for students and practitioners . aths arenot so readily distinguished as in the normal condition. They aremore fibroid, and the lymphoid cells are not so numerous. Thewalls of the vessels are usually somewhat thickened. The cellularelements of the pulp are obscured, but delicate strands of fibrillatedtissue may be seen running through the section in the walls of theenlarged venous sinuses. ( X 300).—The venous sinuses are greatly distended. In themlie numerous coloured corpuscles, with here and there phagocyticpolymorpho-nuclear leucocytes in which are granules of
Practical pathology; a manual for students and practitioners . aths arenot so readily distinguished as in the normal condition. They aremore fibroid, and the lymphoid cells are not so numerous. Thewalls of the vessels are usually somewhat thickened. The cellularelements of the pulp are obscured, but delicate strands of fibrillatedtissue may be seen running through the section in the walls of theenlarged venous sinuses. ( X 300).—The venous sinuses are greatly distended. In themlie numerous coloured corpuscles, with here and there phagocyticpolymorpho-nuclear leucocytes in which are granules of altered bloodpigment. The flattened endothelial cells lining the venous sinuses alsocontain altered blood pigment. Between the sinuses there frequentlyappears to be very little tissue, but careful examination reveals the exist-ence of fibrous strands, on which rest the lining endothelial cells. The CHRONIC VENOUS CONGESTION 523 Malpighiaii corpuscles contain more fibrous tissue than usual, andfewer lymphocytes are seen. Perhaps the most marked changes are. Fig. 163.—Chronic venous or passive congestion of the with logwood. ( x 300.) a. Large pulp sinus cut longitudinally, lined with flattened nucleated endothelium, and filled with red blood corpuscles, with here andthere a deeply stained leucocyte. b. A similar sinus seen in transverse section. Large mononuclear cell seen lying in the centre. c. Small sinuses. d. Vessel in the centre oi{e.) a Malpighian corpu clc. The walls of the vessel are somewhat swollen, and the adventitia l)mphoid and other cells of the adenoid sheath (Mal-pighian corpuscle) are well Around the sinuses in this position there are regular accumula-tions of small rovmd cells in the walls. in the fibrous trabecule, which appear to be considerably thickened,and around the vessels running in them are usually a number of 524 THE SPLEEN leucocytes. There is also fibroid or cartilaginoid thickening of thecapsule (Fig. 162).
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