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Ppt4 ac5 [recovered]
- 1. Compact bone CTcovering Bone matrix & cells Haversian system periosteum endosteum
- 2. Periosteum isa membrane that lines the outer surface of all bones ,except at the joints of long bones .Periosteum consists of dense irregular connective tissue . Periosteum is divided into " 1-periosteum an outer "fibrous " layer inner "cambium layer“ (or "osteogenic layer"). fibroblasts contains contains progenitor cells that develop into osteoblasts . These osteoblasts are responsible for increasing the width of a long bone and the overall size of the other bone types. After a bone fracture the progenitor cells develop into osteoblasts and chondroblasts , which are essential to the healing process. As opposed to osseous tissue periosteum has nociceptive nerve endings, making it very sensitive to manipulation. It also provides nourishment by providing the blood supply. Periosteum is attached to bone by strong collagenous fibers called Sharpey's fibres , which extend to the outer circumferential and interstitial lamellae . It also provides an attachment for muscles and tendons.
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- 4. It is adelicate layer linning the marrow spaces , medullary cavities , volkmanns canals & haversian canals. It consists of single layer of squamous to cuboidal cells with a small cells and variable content of supporting reticular and collagen fibers. It is similar to periosteum but it is thin and not fibrous and it have the ability to form new bone under proper stimulation It is a vascular connective tissue layer rich in osteogenic cells osteoclast and blood vessels. As do cells of the inner periosteum , cells of endosteum retain osteogenic potential 2- Endosteum
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- 7. It is thestructure unit of compact bone . 3-Haversian system