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Bones - Anatomy & Physiology
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Revision as of 12:44, 10 July 2008
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12:44, 10 July 2008
→Composition of Bone
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==Composition of Bone==
==Composition of Bone==
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*Cortical (compact) bone
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*
'''
Cortical (compact) bone
'''
**Sheath covers external surface of long bone, thicker in shaft and thins over epiphyses
**Sheath covers external surface of long bone, thicker in shaft and thins over epiphyses
**Comprised of thin lamallae in a series of concentric tubes arranged around small central canals (collectively known as an '''osteone''')
**Comprised of thin lamallae in a series of concentric tubes arranged around small central canals (collectively known as an '''osteone''')
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*Cancellous (spongy) bone
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*
'''
Cancellous (spongy) bone
'''
**Forms the hematopoeitic center of epiphyses
**Forms the hematopoeitic center of epiphyses
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*Medullary Cavity and Cancellous Interstitium: bone marrow storage and production
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*
'''
Medullary Cavity and Cancellous Interstitium
'''
: bone marrow storage and production
**Red Marrow: richly vascularized, gelatinous tissue with hematopoeitic properties found abundantly in young animals
**Red Marrow: richly vascularized, gelatinous tissue with hematopoeitic properties found abundantly in young animals
**Yellow Marrow: fat infiltration converts red marrow to yellow, causing hematopoeitic properties to dwindle
**Yellow Marrow: fat infiltration converts red marrow to yellow, causing hematopoeitic properties to dwindle
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