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bones form the
skeleton
joints form the passive locomotor system controlled by muscles
there are 2 parts:
dense part
spongy part - contains bone marrow
bone contains:
blood vessels
lymphatics
nerves
does bone grow?
yes, it's the subject of disease and can self-repair
bone constantly remodels to:
preserve its mechanical efficiency
unnecessary bone is:
removed
e.g. the walls of an empty alveolus (tooth socket) disappears after tooth extraction
functions:
supporting framework
enables attachment muscle, essential for movement
protects organs
stores calcium and phosphorous
creates blood cells which are formed in the bone marrow
Development: osteoblasts (mesenchymal cells) secrete
osteoid (ground substance & collagen)
Development: bone develops from
embryonic mesenchyme from either intramembranous ossification or chondral ossification
Development: intramembranous ossification
bone develops from CT e.g facial bones, skull cap
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