Saturday, February 9, 2013

Bony View

  • There are 206 bones in human skeleton,although this number depends on whether the pelvic bones are counted as on or three bones on each side (ilium,ischium and pubis), whether the coccyx or tail bone is counted as one or four separate bones and does not count the variable wormian bones between skull sutures. 
  • Similarly the sacrum is usually counted as a single bone rather than five fused vertebrae.
  • There is also a variable number of small sesamoid bones,commonly found in tendons. The patella or kneecap on each side is an example of a larger sesamoid bone. The patella are counted in total,as they are constant.
  • The number of bones varies between individuals and with age as newborn babies have over 270 bones some of which fuse together later on in life.
  • Human skeleton takes 20 years before it is fully developed. In many animals, the skeleton bones contain marrow, which produces blood cells.

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