Bone marrow. Coloured Scanning Electron Micrograph (SEM) of cells making up human bone marrow. Branching sinusoids (channels, black) are seen in the bone marrow tissue. Bone marrow consists of densely packed red blood cells (erythrocytes, red spheres), white blood cells (granulocytes, blue), and smaller platelets involved in blood clotting (top left, red). Large fat (adipose) cells are coloured brown. Bone marrow occupies the spaces in bone & when active, is dominated by production of red blood cells. With increasing age bone marrow becomes less active, and filled with fat cells. Magnification: x660 at 5x7cm size.
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