Vertebral Column (Spine) & Bony Thorax. Vertebral Column Functions. Support the trunk Provide a place for the ribs & pelvis to attach Permit movement House & protect the spinal cord. Cervical Vertebrae. Neck Region – 7 Atlas: 1 st cervical vertebra (supports the skull)
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Vertebral Column Functions • Support the trunk • Provide a place for the ribs & pelvis to attach • Permit movement • House & protect the spinal cord
Cervical Vertebrae • Neck Region – 7 • Atlas: 1st cervical vertebra (supports the skull) • Axis: 2nd cervical vertebra (forms pivot around which atlas rotates to allow for movement of the head)
Thoracic Vertebrae • Chest region – 12 • Contain rib facets (costal pits) which allow the ribs to attach [usually 3 facets/vertebra]
Lumbar Vertebrae • Lower back - 5 • Largest vertebrae; support weight of body
Sacrum • 5 fused vertebrae • Form the back of the pelvis; contain foramina for the passage of blood vessels
Coccyx • 4 fused vertebrae • Form the “tailbone”
Intervertebral Foramina(Vertebral Foramen) • Openings through which the spinal cord passes
Intervertebral discs • Fibrocartilage discs found between the vertebrae that allow for movement & shock absorption
Spinal Curves • There are 4 normal curves to the spine: cervical, thoracic, lumbar, & sacral.
Lumbar puncture • Procedure done to examine CSF or to administer anesthetic during childbirth; made between the 3rd & 4th or 4th & 5th lumbar vertebrae because the spinal cord ends in the 2nd lumbar vertebra.
Bony Thorax (Thoracic Cage) • Consist of the ribs, sternum, & thoracic vertebrae • Protects the heart, lungs & major blood vessels
Ribs • Rib Pairs 1 – 7 = • True ribs – have a direct connection with the sternum via costal cartilage
Ribs • Rib Pairs 8 – 10 = • False ribs – have an indirect connection with the sternum via costal cartilage
Ribs • Rib Pairs 11 – 12 = • Floating ribs – not connected to the sternum
Sternum (breastbone) Consists of 3 parts: -manubrium – upper part of sternum; attached to clavicles by ligaments -body – middle portion; long narrow bone -xiphoid process – lowest portion of sternum; begins as cartilage but ossifies with age