. The elements of pathological histology with special reference to practical methods . y--<^ i/:^ ...^tV^ I ; ; / ^-^7 .. ? -*^ • . „ ;^/j - N / /.^ „^. „,; - .....V •Al-. Fig. 143.—Wall of a Tubercular Cavity in the Lung, x 545; the bacteria drawnin under a power of X 025. (Koch-Ehrlich method.) A, External portion of wall ofcavity, composed of round-celled and spindle-celled tissue; J5, Inner caseous portion ofwall; a, Tubercle bacilli; h, Streptococcus pyogenes: c, Micrococcus tetragenvs. frequently contain arterial twigs, the lumen of which is in most casesnarrowed or even closed
. The elements of pathological histology with special reference to practical methods . y--<^ i/:^ ...^tV^ I ; ; / ^-^7 .. ? -*^ • . „ ;^/j - N / /.^ „^. „,; - .....V •Al-. Fig. 143.—Wall of a Tubercular Cavity in the Lung, x 545; the bacteria drawnin under a power of X 025. (Koch-Ehrlich method.) A, External portion of wall ofcavity, composed of round-celled and spindle-celled tissue; J5, Inner caseous portion ofwall; a, Tubercle bacilli; h, Streptococcus pyogenes: c, Micrococcus tetragenvs. frequently contain arterial twigs, the lumen of which is in most casesnarrowed or even closed by fibrous thickening of the intima. Some-times, however, the arteries show aneurysmal dilatations, which maythen lead to rupture of the vessel. If the tubercular process ceases to advance, the walls of the 286 THE LUNGS cavities become transformed into connective tissue, by the contrac-tion of which the cavity may gradually be reduced in size orentirely closed, while its contents calcify. Frequently, however,new tubercles form in the vicinity of the cavity, and by their dis-integration contribute to its enlarcjement. Since tubercle bacilli may make their way into the air
Size: 2894px × 864px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectpatholo, bookyear1895
