Class of Bones
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| compact bone | smooth and homogenous
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| spongy bone | composed of small trabeculae (bars) of bone and lots of open space
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| long bones | are much longer than they are wider, generally consisting of a shaft with heads at either ends
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| short bones | typically cube shaped, and they contain more spongy bone than compact bone
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| flat bones | generally thin, with two waferlike layers of compact bone sandwiching a layer of spongy bone between them
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| irregular bones | bones that do not fall into one of the proceeding categories
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| tuberosity | large rounded projection; may be roughened
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| crest | narrow ridge of bone; usually prominent
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| trochanter | very large, blunt, irregularly shaped process (the only examples are on the femur)
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| line | narrow ridge of bone; less prominent than a crest
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| tubercle | small rounded projection or process
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| epicondyle | raised area on or above a condyle
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| spine | sharp, slender, often projected pointed
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| process | prominence or projection
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| head | bony expansion carried on a narrow neck
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| facet | smooth, nearly flat articular surface
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| condyle | rounded articular projection
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| ramus | armlike bar of bone
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| sinus | space within a bone, filled with air and lined with mucous membrane
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| meatus | canal like passageways
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| fossa | shallow, basinlike depression in a bone, often serving as an articular surface
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| groove | furrow
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| fissure | narrow, slit like opening
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| foramen | round or oval opening through a bone
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| periosteum | fibrous membrane covering a long bone
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| diaphysis | shaft of a long bone
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| endosteum | inside lining of a bone
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| articular cartilage | covers the epiphyseal surface in place of periosteum at joint locations
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| epiphysis | end of a long bone
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| haversian canal | runs parallel to the long axis of the bone and carries blood vessels, nerves, and lymph vessels through the bony matrix
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| lamellae | rings of calcified extracellular membrane
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| lacunae | mature bone cells in chambers arranged in concentric circles around the central canal
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| canaliculli | tiny canals radiating outward from a central canal to the lacunae of the first lamellae and then from lamallae to lamallae
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