This is a stained cross section of spongy bone from a human fetus. The spongy bone is blue (1). You can also see the connective tissue between the bones in light blue and gold (2). The outer layers of ...

Myelofibrosis is a rare cancer that affects your bone marrow, the spongy tissue inside some of your bones. In a healthy person, stem cells in the bone marrow make the red blood cells, white blood ...

What is a bone marrow test? A bone marrow test is a way of testing cells from your bone marrow. Bone marrow is the spongy tissue inside your bones that makes blood cells. To find out whether there are ...