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26 Cards in this Set
- Front
- Back
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Functions of the skeletal system |
support protection movement storage blood cell formation |
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The microscopic unit of compact bone |
osteon or haversian system |
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In compact bone, the osteons are |
packed closely together |
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is less dense than compact bone |
spongy bone |
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consists of bone trabeculae around irregular cavities that contain red bone marrow |
spongy bone |
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The trabeculae are organized to provide maximum _______ to a bone. |
strength |
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are longer than they are wide; an example is the femur in the thigh |
long bones |
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are roughly cube shaped; examples include the bones of the wrist. |
short bones |
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have inner and outer tables of compact bone with a diploe of spongy bone in the middle; examples includes the bone of the cranium. |
flat bones |
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are primarily spongy bone with a thin layer of compact bone; examples include the vertebrae. |
irregular bones |
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have a diaphysis around a medullary cavity, with an epiphysis at each end. |
long bones |
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The epiphysis is covered by |
articular cartilage |
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bone forming cells. |
Osteoblasts |
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are mature bone cells. |
Osteocytes |
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break down and reabsorb bone matrix. |
Osteoclasts |
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Bone development is called |
osteogenesis. |
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involves the replacement of connective tissue membranes by bone tissue. Flat bones of the skull develop this way. |
Intramembranous ossification |
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Most bones develop by this_____ in this process, the bones first form as hyaline cartilage models, which are later replaced by bone. |
endochondral ossification |
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Endochondral- |
outside of bone |
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Long bones increase in length at the ___________ |
cartilaginous epiphyseal plate |
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When the epiphyseal plate completely ossifies, increase in length is_______ |
no longer possible. |
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Increase in diameter of long bones occurs by______ |
appositional growth |
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The adult human skeleton has ______ named bones In addition, there are varying numbers of |
206 wormian and sesamoid bones. |
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The axial skeleton has ______bones |
80 |
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The axial skeleton includes the ________ |
skull, vertebrae, ribs and sternum |
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The appendicular skeleton, with ________, bones, includes the _____________. |
126 appendages and their attachments to the axial skeleton. |
