The outer layers of the spongy bone, in red (3), are where it begins to intermingle with the connective tissue that’s starting to become ossified – that is, harder and less flexible ... Bones give our ...

The term “spongy bone” doesn’t mean that the bone is soft or can compress, he says. Rather, it indicates that the bone is porous and lightweight – which is critical for flying birds.

They can be performed at your doctor's office or in a hospital clinic.

Scientists found the stem cells, which give rise to bones, cartilage and the spongy bone that harbors bone marrow, in fetal bones, adult bones and fat, researchers report online September 20 in Cell.

“The structure of the trabecular, or spongy bone that forms in the interior of (the) bones we studied is unique within dinosaurs,” said Anthony Fiorillo, a Southern Methodist University ...