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Compact/Spony Bone

What is an osteon Functional unit of compact bone
Central canal (bone) Contains blood vessels and nerves -lined with endosteum (thin vascular membrane of connective tissue)
Perforating canals -perpendicular to surface of Bone -carry blood vessels into deep bone marrow
Lamellae Layers of bone matrix -collagen fibers of neighboring lamellae run in opposite directions to resist twisting and bending forces
Concentric lamellae Surround central canal
Interstitial lamellae Fill spaces between osteons
Circumferential lamellae Are at outer and inner bone surfaces
Trabecular of spongy bone Matrix of open network of struts -helps reinforce bone strength by resisting forces from multiple directions
What does spongy bone lack? Osteons
What does trabecular lack? Capillaries and venules
Red bone marrow -fills spaces between trabecular -consists of lose connective tissue that supports hematopoietic (blood forming cells) -contains blood vessels that supply nutrients to osteocytes
Yellow bone marrow Stores fat (triglycerides)
Periosteum Vascular membrane that covers outside of Bones -outer, fibrous later and inner, cellular layer -rich with blood vessels -fingers are interwoven with tendons and ligaments
Perforating fibers Fingers that become incorporated into bone today
Function of periosteum -isolate Bone -provide a route for blood vessels and nerves -participate in bone growth and repair
Endosteum Incomplete cellular layer that lines medullary cavity -consists of flattened layer of osteogenic cells and osteoblasts "Incomplete layer containing osteoblasts osteogenic cells and osteoclasts"
Created by: Garciamentzer
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