page_title: Bone marrow
hierarchical_section_title: Bone marrow
caption_attribution_description: Human bone marrow. Highly magnified.
context_page_description: Bone marrow is a type of tissue that can be found in hollow bones of many animals including humans. In adults, the bone marrow in large bones makes new blood cells. Bone marrow makes up about 4% of an adult human's weight.
context_section_description: Bone marrow is a type of tissue that can be found in hollow bones of many animals including humans. In adults, the bone marrow in large bones makes new blood cells. Bone marrow makes up about 4% of an adult human's weight (about 2.6 kilograms).
caption: Gray's Anatomy illustration of cells in bone marrow
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