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===Physis (Growth plate)===
 
===Physis (Growth plate)===
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[[Image:Growth plate.jpg|left|thumb|100px|<small><center>Growth plate (Image sourced from Bristol Biomed Image Archive with permission)</center></small>]]
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[[Image:Growth plate closer.jpg|right|thumb|100px|<small><center>Growth plate magnified(Image sourced from Bristol Biomed Image Archive with permission)</center></small>]]
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*Originates from the cartilage model that remains only at the junction of the diaphyseal and epiphyseal centres
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*Cartilage of metaphyseal growth plate is divided into: (from right to left on the magnified image)
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** - Resting (reserve) zone
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** - Proliferative zone
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** - Hypertrophic zone
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*Site of many '''congenital''' or '''nutritional''' bone diseases in the growing animal
 
*Site of many '''congenital''' or '''nutritional''' bone diseases in the growing animal
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**Regulated by androgens
 
**Regulated by androgens
 
*If growth teporarily stops -> layer of bone seals the growth plate -> moves into metaphysis when growth resumes -> forms '''Harris lines'''
 
*If growth teporarily stops -> layer of bone seals the growth plate -> moves into metaphysis when growth resumes -> forms '''Harris lines'''
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===Bone resorption===
 
===Bone resorption===
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