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Human Skeleton and Locomotion

Skeletal system

  • Human skeletal system is made up of 206 bones.
  • A typical bone consists of osteocytes or bone cells that are embedded in a ground matrix made up of collagen fibres and calcium and phosphorus salts.


 


 

 


 

  • Vertebral column forms the axis of skeleton.

  • It comprises a series of 26 vertebrae.

  • Vertebral formula - Bones of vertebral column starting from skull is C7T12L5S1Co1.

  • Atlas (articulate with occipital condyles) and Axis are the 1st and 2nd vertebrae respectively.

  • Sternum is a flat bone on the ventral midline of thorax.

  • Ribs (12 pairs) are flat bones attached dorsally to vertebral column and ventrally to sternum.

  • True ribs – Upper seven pairs

  • False ribs – 8th, 9th, and 10th pair; as they are not attached to the sternum directly

  • Floating ribs – 11th and 12th (last two pairs); as they are not attached ventrally


 

 

Bones of forelimbs (in both for limbs)

Bones of hind limbs (in both for limbs)

Humerus -2

Femur – 2

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