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***Fine collagen fibres in concentric or parallel laminae
***Fine collagen fibres in concentric or parallel laminae
***Two main types:
***Two main types:
****'''Compact bone''' (cortical)
****'''Compact bone (cortical)'''
*****Forms 80% of total bone mass
*****Forms 80% of total bone mass
*****Consists of cells and interstitial substance - 30% ossein (type of collagen) and 70% minerals, especially calcium phosphate
*****Consists of cells and interstitial substance - 30% ossein (type of collagen) and 70% minerals, especially calcium phosphate
*****Forms the shell of long bone shafts - contain [[Haversian systems]]
*****Forms the shell of long bone shafts - contain [[Haversian systems]]
****'''Cancellous bone''' (spongy or trabecular)
****'''Cancellous bone (spongy or trabecular)'''
*****Made up of plates, tubes or bars arranged in lines of stress
*****Made up of plates, tubes or bars arranged in lines of stress
*****In vertebrae, flat bones and epiphyses of long bones
*****In vertebrae, flat bones and epiphyses of long bones