Nature of Macrophages in Rat Brain

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Abstract
The nature of phagocytes appearing in lesions of the central nervous system is strongly debated with a tendency to assess an exclusively hematogenous origin. We studied the origin of phagocytes appearing in a stab wound in the rat brain. Histochemical stains for acid phosphatase and peroxidase, and silver impregnation techniques were used for our study. The results obtained showed the existence of two macrophage types: endogenous microghocytes and exogenous monocytes.