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periosteum
Fibrous membrane surrounding bone
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Articular cartilage
Layerof hyaline cartilage found at joints covering epiphysis
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Epiphysis
Found at each end of the long bones
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Diaphysis
Shaft of long bones between the bone's epiphyses
The marrow cavity is located in the hollow center
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Endosteum
Membrane that lines the medullary/marrow cavity
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Marrow cavity
The hollow center of the diaphysis of a long bone. It is lined with spongy bone and stores marrow
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Spongy bone
Bone structure where there is not heavy stressed coming from one direction or where stresses come from many different directions
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Compact bones
- AKA dense bone
- Seals the outer surface of bones and found wherever stress on bone arrives from only one dirction
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Lacunae
Sm spaces in matrix between the lamellae of an osteon
Osteocytes are found here
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Osteon
- Supportive columns within compact bone.
- Looks like a cross cut of a tree trunk
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Osteocytes
- Mature bone cells that maintain mineral and protein components of bone matrix.
- Found within the lacunae
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Canaliculi
- Small diffusion channels radiating outward from a central canal.
- Facilitates nutrients, gas and waste exchange between the blood and bone
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Central canal
- AKA Haversian Canal
- Longitudinal canal in center of an osteon that contains blood vessels and nerves
- Intersects with perforating canal
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Perforating canals
- Canal running perpendicular to osteons and intersecting with central canals
- Serves as a passage for nerves, blood vessels, and lymphatic vessels through the periosteum and into the bone
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Trabeculae
- The lattice or meshwork of bony struts found in spongy bone. Space inbetween trabeculae house red marrow
- Unlike compact bone - NO osteons!
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Circumferential lamellae
- The ring like structures that occur underneath the periosteum and wrap around the entire bone
- Circumferential lamellae are added as bone grows in diameter
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Interstitial lamellae
Found between intact osteons and are remanents of old osteons that have been partially removed as the bone remodels
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Concentric lamellae
The calcified matrix rings of an osteon
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Long bones
Bones comprised of 2 epiphysis and diaphysis
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Short bones
No epiphysis, bones almost as wide as they are long, boxy shaped
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Sesamoid bones
- Bones that form inside of tendons
- The largest sesamoid bone is the patella and looks like a nut
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Flat bones
Thin and platelike bones but they can be shaped or curved like the skull or ribs
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Irregular bones
- Bones that do not fit in the other categories
- Examples: vertebrae
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Sutural bone
Usually in skull, they occur where interlocking joints of the skull branch and isolate a small piece of bone.
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Process
Any projection or bump
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Ramus
Extension of a bone making an angle with the rest of the structure
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Trochanter
Large, rough projection
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Tubercle
Small, rounded projection
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Head
Expanded articular end of an epiphysis, separated from the shaft by the neck
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Condyle
Smooth, rounded articular process
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Trochlea
Smooth, grooved articular process shaped like a pulley
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Facet
Small, flat articular surface
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Foramen
Rounded passageway for blood vessels or nerves
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Canal
Passageway through the substance of a bone
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Sinus or Antrum
Chamber within a bone, normally filled with air
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