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Axial Skeleton

Axial Skeleton

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Axial Skeleton

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  1. Axial Skeleton

  2. Skull • Cranial Bones • Facial Bones

  3. Cranial Bones • Frontal Bone – Forms the forehead, the roofs of the orbits, and most of the anterior part of the cranial floor

  4. Cranial Bones • Parietal Bones – form the greater portion of the sides and roof of the cranial cavity

  5. Cranial Bones • Temporal Bones – Form the inferior lateral aspects of the cranium and part of the cranial floor

  6. Cranial Bones • Occipital Bone – Forms the posterior part and most of the base of the cranium

  7. Cranial Bones • Sphenoid Bone – Lies at the middle part of the base of the skull

  8. Cranial Bones • Ethmoid Bone – a light, sponge-like bone located on the midline in the anterior part of the cranial floor medial to the orbits.

  9. Facial Bones • Nasal Bones – meet at the midline and form part of the bridge of the nose

  10. Facial Bones • Maxillae – unit to form the upper jaw.

  11. Cleft Palate • If the maxillary bones do not unite during the weeks 10 to 12 of embryonic development, cleft palate occurs.

  12. Facial Bones • Zygomatic Bones – (cheekbones) form the prominence of the cheeks and part of the lateral wall and floor of each orbit.

  13. Facial Bones • Lacrimal Bones – They are posterior and lateral to the nasal bones and form part of the medial wall of each orbit.

  14. Facial Bones • Palatine Bones – They form the posterior part of the hard palate, part of the floor and lateral wall of the nasal cavity, and a small part of the floor of the orbits.

  15. Facial Bones • Inferior Nasal Concha – form a portion of the inferior lateral wall of the nasal cavity and project into the nasal cavity

  16. Facial Bones • Vomer – A rough triangular bone on the floor of the nasal cavity

  17. Facial Bones • Mandible – lower jawbone

  18. Nasal Septum • Divides the nasal cavity into R. and L. sides • Consists of vomer, septal cartilage (hyaline cartilage), and perpendicular plate of the ethmoid bone

  19. Deviated nasal septum • This occurs when the nasal septum is deflected laterally from the midline of the nose

  20. Orbits Made up of seven bones; • Frontal • Sphenoid • Ethmoid • Palatine • Zygomatic • Lacrimal • Maxilla

  21. Paranasal Sinus • Paired cavities found in the frontal, sphenoid, ethmoid, and maxillary

  22. Paranasal Sinus • Lined with mucous membranes that are continuous with the lining of the nasal cavity

  23. Fontanels • Soft spots – membrane filled spaces

  24. Fontanels • Allow rapid growth of brain during infancy

  25. Fontanels • Allow skull to change shape as it passes through the birth canal

  26. Fontanels • Bone ossification occurs via intramembranous

  27. Hyoid Bone • Between mandible and larynx

  28. Hyoid Bone • Not adam’s apple

  29. Hyoid Bone • Suspended from the styloid processes of the temporal bones by ligaments and muscles.