Human bones have a hard outer layer made of condensed bone and a softer inner core of spongy bone. This landscape of blue, red, and gold is a cross section through a developing human bone. Human bones ...

Medically reviewed by Gagandeep Brar, MD Bone marrow is the deep, interior portion of your bone. Your bone marrow, which has ...

Chronic lymphocytic leukemia-- or CLL-- is a type of cancer that happens in your blood and bone marrow, the spongy tissue inside your bones. While the exact cause isn't known, doctors do know that ...