Structure Of Bone Flashcards
Elements of bone tissue
Cells
Ground tissue
Fibres
Bone cells
Stem cells -osteoprogenitor
Young cells-osteoblast
Mature cells-osteocytes2
Bone removingcells-osteoclasts
Which cells transform into osteoblqst during bone formation
Osteoprogenitor
Osteoprogenitor cells
*Numerous in fetus
*stem cells of mesenchymal origin
*in adults over the bone surface
Resembles fibroblast
Osteoblast
Formed from progenitor
Shapes-cuboidal,oval,triangular
Nucleus -oval shape
Abundant RER,golgi-sythetic activity
Function of osteoblast
Calcification of matrix
Collagen fires,ground substance lays on it
Mature bone cells
Osteocytes
Cytoplasmic processes
Bw the adjacent osteocytes hence situated in lacunae of bone
Seen in large numbers in Young and get decreased as ages
Osteocytes
Function of canaliculi
*deposition/removal of matrix/calcium
*keeping lacunae and canaliculi open by ensuring nutrition of bone
Bone removing cells(demineralisation and removal of matrix
Osteoclasts
Helps in the proper shape of growing bone
Found in surface where resorption takes place
Size of osteoclasts
Very large cells
Multinucleated
Stimulated by parathyroid hormone
Ground substance of bone cells
Proteins
Mineral salt organic and Inorganic
Water
carbohydrates
Structure Of compact bone
1,circumferential system
Outer(periosteal
Inner(endosteal
2,haversian
3,interstitial
Adjacent haversian canal interconnected by
Volkmanns canal(refer fig on note)
