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Skeletal System: Choose the Correct Choice

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dens provides a pivot for rotation for the 1st cervical vertebra
axis
articulates with the ribs
thoracic vertebra
articulates with the hip bone laterally
sacrum
massive vertebrae; weight sustaining
lumbar
tailbone; vestigal fused vertebrae
coccyx
supports the head; allows the rocking motion of the occipital condyles
atlas
seven components; unfused
cervical vertebra
twelve components; unfused
thoracic vertebra