structure of a long bone. gross anatomy diaphysis – shaft diaphysis – shaft makes up most of...
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STRUCTURE OF A LONG STRUCTURE OF A LONG BONEBONE
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GROSS ANATOMYGROSS ANATOMY
DIAPHYSIS – shaftDIAPHYSIS – shaftMakes up most of bone’s Makes up most of bone’s
lengthlengthComposed of compact Composed of compact
bonebone
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PeriosteumPeriosteumFibrous connective tissue Fibrous connective tissue
membranemembraneCovers and protects diaphysisCovers and protects diaphysis
Connected by Connected by Sharpey’s Sharpey’s FibersFibers
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EPIPHYSESEPIPHYSESEnds of long boneEnds of long boneComposed of thin layer Composed of thin layer of compact bone of compact bone enclosing area of enclosing area of spongy bonespongy bone
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ARTICULAR CARTILAGEARTICULAR CARTILAGE
Covers epiphysesCovers epiphysesGlassy, hyaline Glassy, hyaline Provides smooth, slippery Provides smooth, slippery
surface to decrease friction at surface to decrease friction at jointsjoints
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Epiphyseal LineEpiphyseal LineAdult bones: thin line of bony tissue Adult bones: thin line of bony tissue
spanning the epiphysis spanning the epiphysis Remnant of Remnant of epiphyseal plateepiphyseal plate (plate (plate
of hyaline cartilage in young, growing of hyaline cartilage in young, growing bone)bone)
Cause lengthwise growth until end of Cause lengthwise growth until end of pubertypuberty
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MEDULLARY CAVITYMEDULLARY CAVITY Yellow marrow – cavity of shaftYellow marrow – cavity of shaft In adults: storage for adipose tissueIn adults: storage for adipose tissue
In infants: area forms blood cells, red marrowIn infants: area forms blood cells, red marrow
(In adults: red marrow is confined to cavities of (In adults: red marrow is confined to cavities of spongy bone of flat bones, and epiphyses of spongy bone of flat bones, and epiphyses of some long bones: sternum, ribs, femur, cranium)some long bones: sternum, ribs, femur, cranium)
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