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**As it forms, it fuses with the bone surface
 
**As it forms, it fuses with the bone surface
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==Periosteum and blood supply==
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*'''Periosteum''':
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**Specialised sheath of connective tissue covering bone except at the articular surfaces
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**Loosely attached except at tendon insertions and boney prominences (associated with major blood vessels penetrating bone)
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**Histologically:
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***Outer layer - fibrous for support
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***Inner layer - osteogenic
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**Rich supply of nerves and lymph vessels
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**Nutrient, metaphyseal, periosteal arteries
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**Normal flow of blood from medulla to periosteum due to higher pressures in medulla
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**Young animals have greater blood supply
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*'''Endosteum''' lines the marrow cavity
 
*'''Medullary Cavity and Cancellous Interstitium''': bone marrow storage and production
 
*'''Medullary Cavity and Cancellous Interstitium''': bone marrow storage and production
 
**[[Bone Marrow - Anatomy & Physiology#Red marrow|Red Marrow]]: richly vascularized, gelatinous tissue with hematopoeitic properties found abundantly in young animals
 
**[[Bone Marrow - Anatomy & Physiology#Red marrow|Red Marrow]]: richly vascularized, gelatinous tissue with hematopoeitic properties found abundantly in young animals
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