Question | Answer |
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" |