Flat bones

Flat bones
Definition:
Flat bones consist of a layer of spongy bone between two thin layers of compact bone. Their cross-section is flat, not rounded. Examples include the skull and ribs. Flat bones have marrow, but not a bone marrow cavity.
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Bone marrowA spongy tissue located within the body's flat bones--including the hip and breast bones and the skull. Marrow contains stem cells, the precursors to platelets and red and white blood cells.
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The most frequent sites of bony involvement are the flat bones of the skull, ribs, pelvis, and scapula (wing bone). Chronic otitis media due to involvement of the mastoid and the temporal bone is common.
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These cysts usually affect children primarily between the ages of 5 to 15, but can affect older children or adults. In older children and adults, they tend to occur in flat bones (such as the pelvis, jaw, skull or rib cage) or in the large heel bone ...
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The tumor may arise anywhere in the body, usually in the long bones of the arms and legs, the pelvis, or the chest. It may also develop in the skull or the flat bones of the trunk.
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