In the developing embryo all the long bones are first represent by rods of cartilage covered by perichondrium ( the membrane covering cartilage). A primary centre of ossification call the the diaphysis appear at the middle of what will eventually be the shaft of a long bone. calcium is laid down in the matrix and bone cell develop. The perichondrium becomeperiosteum and from it bone cells are laid down show that the bone increase in in circumference as well as in length.
Later in the process of development a secondary centre of ossification appears at each extremity or emphasis begins there and extends towards the shaft and also towards the ine of each epiphysis. The end of the bone remain covered by high line catalyse which becomes the the articular cartilage area of cartilage remains between the soft or devices and each extremity or Emphasis and this layer is called the official 30 days which processed until the bone is fully grown.
Later in the process of development a secondary centre of ossification appears at each extremity or emphasis begins there and extends towards the shaft and also towards the ine of each epiphysis. The end of the bone remain covered by high line catalyse which becomes the the articular cartilage area of cartilage remains between the soft or devices and each extremity or Emphasis and this layer is called the official 30 days which processed until the bone is fully grown.
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