Hematopoiesis in the Suprarenal Body of the Albino Rat

Abstract

The authors observed hematopoiesis in the suprarenal body of albino rats after birth. The hematopoiesis in this organ is a normal occurence, though it varies individually to a great extent in amount even at the same age.
Erythropoiesis is generally most active nearly for five days after birth, then gradually diminishes and ceases soon. It occurs in both the cortex and medulla. Although the erythrocytes seem to be extravascular in origin, their proliferation and maturation proceed also within the blood vessels. Granulopoiesis is comparatively conspicuous for several days after birth as the erythropoiesis. The leucocytes (special and eosinophil) are formed extravascularly in the medulla, particularly in the vicinity of the cortex.
Megakaryocytes also appear accompanied with the erythro- and granulopoiesis. These cells are seen generally intravascularly, and occasionally extravascularly.