the hard material that makes up the shaft of long bones and the outside surfaces of other bones.
Compact bone is where marrow spaces are narrow or lacking and the bone substance is densely packed. Both varieties, spongy and compact, have the same types of cells and intercellular substance.
ery dense bone tissue that forms the outer shell of bones and composes a large part of the long bones of the arms, legs, and ribs. It is also called cortical bone or lamellar bone.