Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
16 Cards in this Set
- Front
- Back
|
Name the two types of bone tissue in mature bones.
|
cortical (compact) bone and cancellous (spongy) bone
|
|
|
Cortical bone represents what percent of the skeletal human body?
|
80%
|
|
|
Why is it called a compact tissue?
|
Because it forms a protective outer layer around every bone in the body.
|
|
|
The osteon is?
|
The structural unit of compact bone.
|
|
|
Osteons look like
|
groupings of bullseyes.
|
|
|
Each osteon has a central canal known as
|
Haversian canal
|
|
|
Haversian canals contain
|
capillaries, arterioles, venules, nerves, and probably lymphatics. Between the osteons are interstitial lamellae (3–15 layers of mineralized bone). The overall structural pattern of cortical (compact) bone gives it a plywood-like strength that is highly resistant to bending, torsion, and breakage. Cortical bone has a very slow turnover rate.
|
|
|
Cancellous Bone is called
|
spongy
|
|
|
Cancellous bone represents
|
about 20% of the skeletal mass, but 80% of bone surface.
|
|
|
Cancellous bone consists of
|
Cancellous bone contains a trabecular (mesh-like) network of bone tissue that allows it to maintain its shape despite compressive forces.
|
|
|
The structural unit of cancellous bone has several characteristics:
|
The structural unit of cancellous bone has several characteristics: (1) it does not contain osteons; (2) it is less dense than cortical bone; (3) it is very elastic; (4) it has a higher turnover rate than cortical bone. Cancellous bone maintains an intricate balance of bone cells, marrow, and other tissues vital for bone formation. It is as hard as cortical bone, but it is formed in such a way as to appear spongy or mesh-like. Cancellous bone comprises most of the bone in the axial skeleton, including the bones of the skull, ribs, ears, and spine.
|
|
|
The narrow channels through which the osteocytes extend.
|
canaliculi
|
|
|
A spongy structure; refers mostly to bone tissue.
|
cancellous bone
|
|
|
The hard layer that generally makes up the outer surface of bones.
|
cortical (compact) bone
|
|
|
Small cavities containing mature bone cells
|
lacunae
|
|
|
Mature bone cells.
|
osteocytes
|
