Granulation and Scarification.
SUPPURATING wounds heal in the same way as ulcers. The chasm is filled up by the appearance of little soft elevations of new substance, which originate at all points, and meet at the centre, drawing the sides nearer together, and raising the bottom towards the surface. This is called granulation, because these elevations look like grains; and the result is a new tissue, of a peculiar character, which constitutes the cicatrix, or sear.
Reproduction of Lost Parts.
Among some of the lower animals, whole limbs which have been destroyed are easily reproduced. It is not so with man; though certain parts, when only partially destroyed, are sometimes regenerated. Thus, portions of skin, of considerable extent, are often reproduced; and so are the whole of some long bones, when destroyed by necrosis.
The same is true, to some extent, of ligaments. But portions of brain, and spinal marrow, and muscle, and mucous membrane, when once removed, are never regenerated.
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