Numbers Making up the Human Spine

The Human Spine in Numbers by Dr. Ozgur

  • The spine is made up of 33 vertebrae.
  • More than 13 million neurons are found in the spine.
  • Adults only have 26 vertebrae because bones fuse together as we age.
  • There are 220 ligaments in the spine.
  • There are 7 vertebraes in the necks of humans and giraffes.
  • The spine has over 120 muscles.
  • There are 5 spinal cord regions:
    • 7 cervical vertebrae
    • 12 thoracic vertebrae
    • 5 lumbar sacrum fused vertebrae
    • 4 coccyx fused vertebrae
  • The spine has over 100 joints
  • The 4 coccyx vertebraes fuse together to form the tail bone
  • The average weight of the spinal cord is 35 grams
  • The spine has 3 important functions:
    • movement of the trunk
    • support for the body and respiratory function
    • protect the spinal cord & nerve structures
  • Primary motions of the spine:
    • flexion (forward)
    • extension ((backward)
    • bending (left & right)
    • rotation (central axis)