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Lecture 6.5: Skeletal System PowerPoint Presentation
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Lecture 6.5: Skeletal System

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  1. Lecture 6.5: Skeletal System

  2. Facial Bones • Protect and support digestive and respiratory tracts

  3. Maxillary Bones • Floor of orbits • Walls of nasal cavity • Hard palate—roof of mouth

  4. Figure 6.12b

  5. Palatine Bone (paired) • Posterior to hard palate

  6. Figure 6.12b

  7. Vomer • Forms part of nasal septum

  8. Figure 6.11a

  9. Zygomatic bone • Cheekbones

  10. Figure 6.11a

  11. Nasal Bone • Bridge of nose

  12. Figure 6.11a

  13. Lacrimal Bone • Orbits medial surface

  14. Figure 6.11a

  15. Inferior nasal conchae (paired) • Lateral nasal cavity • Slows airflow

  16. Figure 6.12c

  17. Mandible • Lower Jaw • Only moveable facial bone

  18. Figure 6.11a

  19. Hyoid Bone • U-Shaped • Base for larynx muscles (voicebox), tongue and pharynx • Stabilizes larynx • “Adams Apple”

  20. Figure 6.14

  21. Skulls of Infants • Fusion of bones not complete at birth • Fontanels—soft spots • Flexible • Allows skull to expand with brain

  22. Figure 6.15b

  23. Vertebral Column • AKA: Spine • Cervical Vertebrae—7 • C1-C7 • Neck Region • Thoracic Vertebrae—12 • T1-T12 • Articulates with ribs • Lumbar Vertebrae—5 • L1-L5 • Lower Back • Sacrum—5 fused vertebrae • Coccyx--Tailbone

  24. Figure 6.16

  25. Spinal curvature • 4 Spinal curves • Primary curves—thoracic and sacral • Appear late in fetal development • Secondary curves—cervical and lumbar • Appear months after birth • Cervical—infant can hold up their head • Lumbar—child can stand

  26. Figure 6.16

  27. Abnormal Spinal curves • Kyphosis—exaggerated thoracic curvature • Lordosis—exaggerated lumbar curvature • Scoliosis—abnormal lateral curvature

  28. Vertebral Anatomy • Vertebral body—massive, weight-bearing portion • Intervertebral disc—lies between each vertebrae • Vertebral canal—encloses spinal cord • Intervertebral foramina—gaps that allow nerves to run off

  29. Figure 6.17a