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Understanding the Skeletal System: Cervical, Lumbar, and Thoracic Structures

Dive into the skeletal system, exploring the cervical vertebrae (Atlas - C1, Axis - C2), lumbar vertebrae, and thoracic cage. Discover how these structures support body weight, allow motion, and protect vital organs. Learn about the different types of ribs and the unique features of the sternum. This comprehensive lecture provides insights into the complexities and functions of the human skeletal system.

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Understanding the Skeletal System: Cervical, Lumbar, and Thoracic Structures

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  1. Lecture 6.6: Skeletal System

  2. Cervical Vertebrae • Atlas-C1 • Holds up head • Allows “yes” motion • Axis—C2 • “No” motion

  3. Figure 6.18

  4. Lumbar Vertebrae • Most massive • Least mobile • Support most of body weight

  5. Figure 6.17c

  6. Thoracic Cage • Thoracic vertebrae, ribs and sternum • Protects heart and lungs

  7. Ribs • 12 pairs • True Ribs—first 7 pairs • Connect to sternum via costal cartilage • False ribs—pairs 8-12 • Do not directly attach to sternum • Floating ribs—pairs 11-12 • No connection to sternum

  8. Figure 6.20b

  9. Sternum • Breastbone • Not fully fused until 25 • Xiphoid process—inferior tip

  10. Figure 6.20a

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