Are the megakaryocytes of the spleen of white laboratory rats identical to megacariocytes of the bone marrow?

Many aspects of spleen histophysiology in humans and mammals still remain unsolved until today. This includes the spleen in white rats. The presence of megakaryocytes in its parenchyma has been only briefly indicated in some papers. As for appropriate information, let alone illustration, it is not available even in manuals on histology or the current histological atlases. The aim of the study is to obtain comparative morphological data on the spleen and marrow megakaryocytes in white rats. The object of this study is the spleen and marrow of the mandibular bone of outbred white rats (n=17) weighing 180,0-200,0 g. Staining the spleen preparations and mandibular trabecular bone tissue paraffin sections with hematoxylin and eosin, Azur-II-eosin and according to Van Gieson. In the spleen of white rats, megakaryocytes they appear identical to the marrow megakaryocytes.