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IB131_9.4.09_Bones.Axial.Skel_pdf

IB131_9.4.09_Bones.Axial.Skel_pdf - Overview of the...

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Overview of the Skeleton Regions of the skeleton axial skeleton = central axis skull, vertebral column, ribs, sternum & sacrum appendicular skeleton = limbs & girdles Number of bones 206 in typical adult skeleton varies with development of sesamoid bones (patella) start at 270 at birth w/ fusion start at 270 at birth,
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Functions of the Skeletal System Support Movement: leverage (force of motion) Protection Mineral storage (Ca 2+ PO 4 3- ) ,PO Blood cell production (red marrow) Energy storage: lipids (yellow marrow)
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Classification of Bones Bone Shapes Long bones long and thin found in arms, legs, hands, feet, fingers, toes Flat bones thin with parallel surfaces found in the skull, sternum, ribs, scapulae Sutural bones small, irregular bones found between the flat bones of the skull Irregular bones have complex shapes Examples: spinal vertebrae, pelvic bones Short bones small & thick Examples: ankle and wrist bones Sesamoid bones Small & flat Develop inside tendons near joints of knees, hands, & feet
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Bone Markings Depressions/ grooves Along bone surface Projections Where tendons & ligaments attach At articulations with other bones At articulations with other bones Tunnels/ openings Passage of blood vessels & nerves
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Bone Surface Features
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Bone Surface Features
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