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Spongy (cancellous) bone is lighter and less dense than compact bone. Spongy bone consists of plates (trabeculae) and bars of bone adjacent to small, irregular cavities that contain red bone marrow. The canaliculi connect to the adjacent cavities, instead of a central haversian canal, to receive their blood supply.
Cortical bone is dense and forms the surface of bones. It is solid in appearance, and constitutes as 80% of total bone mass. Compact bone is composed of many cylinder shaped units called osteons, or Haversian Systems (after the anatomist who discovered them.).Spongy Bone: Cancellous bone is a type of osseous tissue with a low density and strength but very high surface area, that fills the inner cavity of long bones.Cancellous bone lies between two layers of compact bone, and this helps contribute to bone strength. As you can guess by it's name, it looks spongy, or porous.ortical bone is dense and forms the surface of bones. It is solid in appearance, and constitutes as 80% of total bone mass. Compact bone is composed of many cylinder shaped units called osteons, or Haversian Systems (after the anatomist who discovered them.).