Clinical lectures on the principles and practice of medicine . pecially tumors, are very variableas to rapidity of increase ; but the manner iu which the development isaccomplished is of three distinct hinds. 1st, The elementary texturesare produced in the same manner as they are in adult tissues. Theyare either more numerous or larger, but preserve their normal relationand mode of arrangement (lipoma, adenoma, anigonoma). 2d, A matteris thrown out from the blood, which serves as a blastema for the forma-tion of cells, which may be detected in various stages of development,undergoing the same
Clinical lectures on the principles and practice of medicine . pecially tumors, are very variableas to rapidity of increase ; but the manner iu which the development isaccomplished is of three distinct hinds. 1st, The elementary texturesare produced in the same manner as they are in adult tissues. Theyare either more numerous or larger, but preserve their normal relationand mode of arrangement (lipoma, adenoma, anigonoma). 2d, A matteris thrown out from the blood, which serves as a blastema for the forma-tion of cells, which may be detected in various stages of development,undergoing the same changes that similar textures are seen to present inthe embryo (fibroma, osteoma). 3d, The cells, whether pre-existing ornewly formed, assume such a property of self-multiplication that theirnormal relation and mode of arrangement is destroyed (epithelioma,enchonclroma, carcinoma). These 4hree modes of increase may occursingly or together. Any one or two of them may be superadded to thethird, and their occurrence at different times and in various proportions. Fig-. 301. accounts to a great extent for the apparent anomalies exhibited in theprogress of individual growths. The third mode of development just alluded to deserves special con-sideration. It consists of the usual kind of endogenous multiplication ofcells, with this difference, that sometimes these cells previously existed,whilst at others they have been newly formed in an exudation. Toexplain my meaning, I must beg the reader to consult two figures—one byKolliker (Fig. 301), representing cell structures in the softened articular Fig. 301. Cartilage cells from a velvety articular cartilage of the condyle of thefemur of a man.—(Kolliker.) 350 diam. 236 PKINCIPLES OF MEDICINE.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectmedicine, bookyear187
