Axial Vertebrae

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Presentation of the Vertebral Column of the Axial Skeleton.

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Axial Vertebrae

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

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