Megakaryocyte proplatelet processes

Scanning electron micrograph (x3000) shows the luminal view of the confluence of two bone marrow sinusoids with two proplatelet processes protruding through the lining endothelial cells. One of the processes has intermittent constrictions (arrows), indicating potential sites for platelet formation. Other cells depicted include lymphocytes and erythrocytes.

Reproduced with permission from: Becker, RP, Bruyn, PPH. The transmural passage of blood cells into myeloid sinusoids and the entry of platelets into the sinusoidal circulation; A scanning electron microscopic investigation. Am J Anat 1975; 145:183. Copyright © 1975 John Wiley &Sons, Inc.

Graphic 73160 Version 1.0

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