Bone Structure - space between the trabeculae are filled...

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Bone Structure Compact Bone Compact bone is very dense and has a regular repeating shape. It is found on the external surface of most bones and on both the external and internal surface of flat bones. The osteon is the basic structural unit of compact bone. The osteon is comprised of cylinders of tissue formed from layers of matrix arranged around central canal holding a blood vessel. Lacunae containing osteocytes (recall that individual osteocytes are connected to each other and their blood supply by tiny cell processes in canaliculi) are located at regular intervals within the layers of the osteon. Perforating canals are vascular canals that run perpendicular to the length of the bone and join the central canals to the main blood supply. Spongy Bone Spongy bone has a sponge-like appearance formed by rods and plates of bone called trabeculae . Unlike compact bone, trabeculae have an irregular shape with few osteons or central canals. The
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Unformatted text preview: space between the trabeculae are filled with red bone marrow; therefore no osteocyte is far from the blood supply of the bone marrow. Spongy bone provides strength with little weight and trabeculae often develop along stress lines of the bones. Bone Marrow The center cavity of bones and the spaces between trabeculae are filled with a soft, gelatinous tissue called bone marrow. Red marrow is a mesh of reticular fibers and stem cells that looks similar to thickened blood. This tissue is hemopoietic and gives rise to red blood cells, white blood cells and platelets. Red bone marrow is found in the vertebrae, ribs, sternum, pelvic girdle and proximal heads of femur and humerus in adults. Yellow marrow is a fatty substance that fills the shafts of most long bones in adults. It is not hemopoietic and is mostly an energy reservoir....
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This note was uploaded on 01/30/2012 for the course BSC BSC1085 taught by Professor Sharonsimpson during the Fall '10 term at Broward College.

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