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appendicular skeleton
bones of the shoulder, pelvis, and upper and lower extremities
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axial skeleton
bones of the skull, vertebral column, chest, and hyoid bone (U-shaped bone at the base of the tongue)
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bone
specialized connective tissue compose of osteocytes (bone cells); forms the skeleton
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compact bone
tightly solid bone tissue that forms the exterior of bones
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spongy bone
cancellous bone
mesh-like bone tissue found in the interior of bones, and surrounding the medullary cavity
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long bones
bones of the arms and legs
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short bones
bones of the wrist and ankles
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flat bones
bones of the ribs, shoulder blades, pelvis, and skull
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irregular bones
bones of the vertebrae and face
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sesamoid bones
round bones found near joints (e.g., the patella)
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epiphysis
wide ends of a long bone (physis = growth)
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diaphysis
shaft of a long bone
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metaphysis
growth zone between the epiphysis and the diaphysis during development of a long bone
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endosteum
membrane lining the medullary cavity of a bone
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medullary cavity
cavity within the shaft of the long bones; filled with bone marrow
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bone marrow
soft connective tissue within the medullary cavity of bones
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red bone marrow
functions to form red blood cells, some white blood cells, and platelets; found in the cavities of most bones in infants and in the flat bones in adults
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yellow bone marrow
gradually replaces red bone marrow in adult bones; functions as storage for fat tissue and is inactive in the formation of blood cells
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periosteum
a fibrous, vascular membrane that coves the bone
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articular cartilage
a gristle-like substance on bones where they articulate
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