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3 Cards in this Set
- Front
- Back
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3 main osteocells used in this process: Osteoblasts Osteoclasts Osteocytes |
B for ‘building cells’, they deposit minerals into the bone tissue CL for clearing old tissue, by occupying the cracks in the bone and dissolving surrounding damaged tissue Mature osteoblasts that have created their own site within bone tissue to maintain structure |
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Bone facts |
Bone tissue nearly always starts from cartilage (strong collagen fibres) The presence of minerals and salts is required to convert it to skeletal tissue- one of the main minerals being calcium Lengthening is achieved by the expansion of epiphyseal plates and each end of the diaphysis Plates expand, allowing new cells to form and increase the length of the shaft at both ends Process stops when thickness of epiphyseal plates decreases which occurs at different rates for different bones |
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4 stages of bone growth and repair: 1) Hematoma formation 2) Bone generation 3) Bony callus formation 4) Bone remodelling |
1) Blood vessels tear and haemorrhage Results in formation of clotted blood at site of break Severed blood vessels are sealed by clotting process Bone cells deprived of nutrients begin to die 2) Within days capillaries growth into hematoma Phagocytic cells begin to clear away the dead cells Fibroblasts and osteoblasts enter the area to begin to reform bone Fibroblasts produce collagen fibres that connect the broken bone ends Osteoblasts start to form spongy bone The repair tissue between the ends of the broken bone (the fibrocartilaginous callus) is composed of both hyaline and fibrocartilage 3) The fibrocartilaginous callus is converted into a bony callus spongy bone Takes 2 months for bone ends to be firmly joined together 4) The bony callus is remodelled by osteoblasts and osteoclasts. Excess material from exterior of bone and medullary cavity is removed Compact bone is added to create bone tissue similar to original, unbroken bone Remodelling can take months and bones can be uneven for years |
