Gross and Micro
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| Cortical Bone | Dense, Concentric layers ("osteons" or Haversian systems) | Strength - for bearing Weight
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| Cancellous Bone | spongy bone - open Latticework of struts (Trabeculae) | Support, transfers energy, Light
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| Medullary Canal | space with the Shaft of bone | contains Yellow Marrow for Energy storage
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| Nutrient Foramina | Holes in Compact bone | for Larger Blood Vessels
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| Periosteum | layers of Dense Regular Connective Tissue on the Outer surface of bone | source of Cells in-case Repair is needed
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| Haversian Canals | Longitudinal channels in bone | contain Blood Vessels and Nerve fibers
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| Osteocytes | Mature bone cells trapped in small pockets (Lacunae) | Maintain the matrix
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| Canaliculi | Cracks in Matrix | connect Lacunae to Haversian Canals
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| Lamellae | Rings of intercellular Matrix | contain the Haversian Canals, Osteocytes, and Canaliculi
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| Osteoblasts | Young bone cell | Forms bone
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| Osteoclasts | Large bone cell | lysosomes dissolve and absorb existing bone (to remodel)
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| Intramembranous Ossification | Hardening within Fibrous Connective Tissue | the Formation of the Flat bones of the Skull, Clavicle, and Repair bone Fractures
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| Endochondral Ossification | Replacement of Cartilage replica with Bone cells | to Form ALL parts of Skeleton EXCEPT Skull and Clavicles
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| Red Marrow | Myeloid Connective Tissue | produces Red and White BC - in Flat bones and Epiphyses of Long bones
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| Yellow Marrow | Adipose | for Energy storage - found in Medullary canals
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| Skeleton | ALL the bones of the body | 1. Protection: from trauma; ribs cranium
2. Permits movement/leverage: forms joints
3. Support: provides resistance to gravity
4. Passage of Soft Tissue, Nerves, and Blood Vessels
5. Mineral Reserve: Calcium and Phospherous
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