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**As it forms, it fuses with the bone surface
**As it forms, it fuses with the bone surface
==Periosteum and blood supply==
*'''Periosteum''':
**Specialised sheath of connective tissue covering bone except at the articular surfaces
**Loosely attached except at tendon insertions and boney prominences (associated with major blood vessels penetrating bone)
**Histologically:
***Outer layer - fibrous for support
***Inner layer - osteogenic
**Rich supply of nerves and lymph vessels
**Nutrient, metaphyseal, periosteal arteries
**Normal flow of blood from medulla to periosteum due to higher pressures in medulla
**Young animals have greater blood supply
*'''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