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Another type of connective tissue is cartilage which is a tough yet flexible solid extracellular tissue that is part of the skeletal system. Cartilage is used as padding between bones at the joints and is also used as flexible support for structures like the windpipe, nose, and ears.
In compact bone, the haversian systems are packed tightly together to form what appears to be a solid mass. The osteonic canals contain blood vessels that are parallel to the long axis of the bone. These blood vessels interconnect, by way of perforating canals, with vessels on the surface of the bone.Bone cells are called osteocytes. There are similarities and differences between spongy and compact bone types.The obvious difference is in their density--spongy is less dense than compact, just as the name implies. The combination of the two give both strength and flexibility.n compact bone, the haversian systems are packed tightly together to form what appears to be a solid mass. The osteonic canals contain blood vessels that are parallel to the long axis of the bone. These blood vessels interconnect, by way of perforating canals, with vessels on the surface of the bone.