pack Flashcards
(10 cards)
What is the inorganic phase of bone?
An impure form of hydroxyapatite (Ca10[PO4]6[OH]2).
What is the organic phase of bone predominantly composed of?
Type I collagen
What comprises the cortex of bone?
Compact (cortical) bone.
What is contained in the medullary canal of bone?
Variable amounts of cancellous (trabecular) bone fatty and hematopoietic marrow blood vessels and nerves.
How is bone tissue categorized histologically?
Into woven and lamellar types based on the organization of type I collagen fibers.
What characterizes woven bone?
Collagen fibers arranged in a seemingly random organization.
What characterizes lamellar bone?
Collagen fibers deposited in parallel arrays either longitudinally or circumferentially.
What are the cylindrical units of mature cortical bone called?
Osteons.
What does an osteon consist of?
A central Haversian canal surrounded by 4-20 concentric lamellae.
What is the outer boundary of each osteon called?
cement line
