Changes

==Composition of Bone==

==Composition of Bone==

*Cortical (compact) bone

*'''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''')

*Cancellous (spongy) bone

*'''Cancellous (spongy) bone'''

**Forms the hematopoeitic center of epiphyses

**Forms the hematopoeitic center of epiphyses

*Medullary Cavity and Cancellous Interstitium: bone marrow storage and production

*'''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