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BONES.ppt - Components of the Skeletal System Bones...

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Components of the Skeletal System Bones Cartilage Component of embryonic, growing and mature bones and joints Ligaments & Tendons Dense fibrous connective tissue Ligaments connect bones Tendons connect muscles to bones
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Types of Bone Cells stem cells derived by mesenchyme develop into osteoblasts Found in bone membranes synthesize and secrete osteoid (collagen) Found in bone membranes Maintain matrix, monitor stress Present within and surrounded by bone tissue Formed by fusing bone marrow cells Digest and dissolve bone matrix Found in bone membranes
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Osteoid (largely collagen) produced by osteoblasts Gives bone tensile strength by resisting stretching, contribute to flexibility Crystals (largely calcium phosphate) deposited around collagen fibers Hardened matrix accounts for relative rigidity of bones Inorganic Removed-Organic Remains Organic Removed-Inorganic Remains Bone Matrix Organic 2/3 Matrix is Inorganic 1/3 Matrix is Organic Inorganic
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Types of Bone Tissue Compact Bone ( Dense or cortical bone) Relatively dense CT Appears white, smooth, and solid 80% of bone mass Spongy Bone ( Cancellous or trabecular bone) Located internal to compact bone Appears porous 20% of bone mass
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Internal circumferential lamellae Interstitial lamellae partially resorbed osteo n found between newer, complete osteons Interstitial lamellae External circumferential lamellae Circumferential lamellae External: rings of compact bone found immediately internal to bone periosteum Internal: rings of compact bone adjacent to the endosteum Osteon Central (Haversion) Canal Perforating (Volkmann’s) Canal Perforating Canal Carry blood vessels and nerves through compact bone, interconnecting Central canals of osteons Central Canal Carry blood vessels and nerves through the middle of osteons Lined by Osteon Functional unit of compact bone composed of concentric lamellae
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