Practical pathology; a manual for students and practitioners . lls of thealveoli. Note the transparency of the clot, and that it does not takeon the staining material at all readily. Observe also that the clot fillsthe air vesicle. The tunica adventitia of the small vessel seen insection is infiltrated with carbon pigment. /;-. bronchus. Harden (§ 62 or 63), stain (.^.^ 102, 103, or 104, and 167), andmount (iii- 195 or 193 and 199). ( X 50).—The air cavities are now completely y^Z/v/with a delicatelooking film, through which //X//^ s readily trausmitteJ. In this filmare seen numerous nuclei. T
Practical pathology; a manual for students and practitioners . lls of thealveoli. Note the transparency of the clot, and that it does not takeon the staining material at all readily. Observe also that the clot fillsthe air vesicle. The tunica adventitia of the small vessel seen insection is infiltrated with carbon pigment. /;-. bronchus. Harden (§ 62 or 63), stain (.^.^ 102, 103, or 104, and 167), andmount (iii- 195 or 193 and 199). ( X 50).—The air cavities are now completely y^Z/v/with a delicatelooking film, through which //X//^ s readily trausmitteJ. In this filmare seen numerous nuclei. The blood vessels forming the outlines of k 442 THE LUNG the air vesicles are less distinctly seen than in the normal lung, andsometimes contain a comparatively small amount of blood. The vessels in the deep layer of the pleura and in the interlobularsepta are engorged with blood, and there is thickening of the fibroustissue (due to oedema); on the surface, often above the flat cell layer,is a quantity of coagulated fibrinous lymph, which has all the char-. Fig. 131.—Drawing of series of air vesicles wiih contained fibrinousexudation. Red hepatisation. Weigerts fibrin stain and alum carmine.(X90.) Blood vessels in interalveolar septa, in this case somewhatdistended with Network of fibrinous lymph attached to the wall of the airvesicle; at some points it has retracted from the wall. Thewhite and red blood corpuscles may be seen en;angled inthe meshes of the fibrinous Carbon pigment in perivascular lymph Vessel with elastic tissue in its wall. acters of that seen filling the air cavities and the smaller bronchi,except that it is stained somewhat more brown, is more granular, andis not (|iiite so transparent. ( X 300).—The exudation completely fills, and even distends, theair vesicles; it is composed of a delicate meshwork of coagulatedfibrin (exuded from the capillary vessels), the fibrils of which areattached to the walls of the air vesic
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