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Axial Vertebrae
 

Axial Vertebrae

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Presentation of the Vertebral Column of the Axial Skeleton.

Presentation of the Vertebral Column of the Axial Skeleton.

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    Axial Vertebrae Axial Vertebrae Presentation Transcript

    • Axial Skeleton
      The Vertebral Column
    • The Vertebral Column
      Extends from skull (supports the skull) to the pelvis (distributes weight to lower limbs)
      Five sections: cervical, thoracic, lumbar, sacrum, coccyx
      Born with 33 vertebrae, but nine fuse into two bones (sacrum and coccyx)
      Vertebrae separated by intervertebral discs
    • The Vertebral Column – VertebraeStructure
      Body/Centrum – disc-like part facing anteriorly
      Vertebral arch – formed by joining of all posterior extensions of vertebra
      Vertebral foramen – opening which spinal cord passes
      Transverse processes – two lateral projections from arch
      Spinous process – projection from posterior of arch
      Articular processes – superior and inferior projections lateral to foramen that articulate with above vertebra
    • The Vertebral Column – Vertebrae Structure
    • The Vertebral Column – Cervical Vertebrae
      7 vertebrae (identified as C1 to C7)
      First two vertebrae are Atlas (C1) and Axis (C2)
      Allow for the movement/rotation of skull
      Do not have a body
      Atlas articulates with the occipital condyles of the skull
      C3 through C7 are remaining cervical vertebrae
      Smallest vertebrae
      Contain transverse foramen
      Spinous processes usually split in middle
    • The Vertebral Column – Cervical Vertebrae
    • The Vertebral Column – Thoracic Vertebrae
      12 vertebrae (identified as T1 to T12)
      Connected with ribs
      Typical shape, slightly modified for ribs
      Includes costal facets to articulate with ribs in posterior
      Spinous process long, pointed down
    • The Vertebral Column – Thoracic Vertebrae
    • The Vertebral Column – Lumbar Vertebrae
      5 vertebrae (identified as L1 to L5)
      Bulkier shape
      Hatchet-shaped spinous processes
      Receives most of stress on vertebral column
    • The Vertebral Column – Lumbar Vertebrae
    • The Vertebral Column – Sacrum and Coccyx
      Sacrum is inferior to the L5 vertebra and superior to the coccyx
      Formed from the fusion of five vertebrae
      Alae are winglike projections that articulate laterally with the hip bones
      Forms posterior wall of pelvis
      Includes median sacral crest and dorsal sacral foramina
      Coccyx is inferior to sacrum
      Formed from fusion of three to five tiny vertebrae
      Commonly called the “tailbone”
    • The Vertebral Column – Sacrum and Coccyx