The Vertebral Column.

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Presentation transcript:

The Vertebral Column

Consists of 33 vertebrae: - 24 separate vertebrae - 8-10 fused vertebrae Each individual vertebrae is separated by intervertebral discs

Divisions of the Vertebral Column Cervical (neck) – 7 vertebrae Thoracic (chest) – 12 vertebrae Lumbar (low back) – 5 vertebrae Sacrum – 5 fused vertebrae Coccyx (tailbone) – 3-5 fused

4 Normal Curvatures: Cervical Thoracic Lumbar Sacral

Curves in the fetus? Only one – concave anteriorly Cervical develops at 3-4 months Lumbar develops at about 1 year

Abnormal Vertebral Curves: Kyphosis: An increased roundness of the thoracic curve “hunchback”

Lordosis: Increased lumbar curvature pregnancy and “potbellies”

Scoliosis: Abnormal lateral curvature

The Cervical Vertebrae Atlas – 1st cervical vertebrae Supports the head Axis – 2nd cervical vertebrae Has a process that projects into the ring of the atlas

The Thoracic Cage Protects the heart and lungs Ribs – 12 pairs - 7 upper connect to vertebrae and sternum “true” ribs - 5 lower do not connect directly to the sternum “false” ribs

Sternum - 3 parts: 1. Manubrium 2. Body 3. Xiphoid process

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