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#'''Dead cells''' become the matrix for bone growth.
 
#'''Dead cells''' become the matrix for bone growth.
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===Girth===
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===Width===
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*The '''perisosteum''' lines the outer surfae of the diaphysis of the bone.
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**It has a cellular inner layer, consisting of osteoblasts, and a fibrous outer layer.
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*The '''endosteum''' lines the inner surface of the diaphysis of the bone.
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**It contains osteoblasts ''and'' osteoclasts.
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*''Bone growth occurs by a shift in the equilibrium between osteoblasts and osteoclasts''.
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**Osteoblasts on the outside in the periosteum, add bone to increase the bone's diameter.
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**Osteoclasts on the inside in the endosteum remove this bone to maintain bone diameter.
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**When osteoclasts start removing less bone, or osteoblasts start adding more bone, the girth increases.
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