Bones of the skull

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Bones of the skull

  1. 1. Bones of the Skull (pg 4)
  2. 2. Bones of the Skull • Skull contains 22 bones (8 cranial and 14 facial)
  3. 3. Bones of the Skull • Skull contains 22 bones (8 cranial and 14 facial) • Cranial bones form the cranial cavity that surrounds and protects the brain
  4. 4. Bones of the Skull • Skull contains 22 bones (8 cranial and 14 facial) • Cranial bones form the cranial cavity that surrounds and protects the brain • Facial bones form the framework of the face, support the entrances to the digestive and respiratory systems, and provide attachment points for the muscles involved in facial expression
  5. 5. Cranial Bones • Frontal (1): Forms the forehead and the roofs of the eye sockets
  6. 6. Cranial Bones • Frontal (1): Forms the forehead and the roofs of the eye sockets • Parietal (2): Form the sides and roof of the cranial cavity.
  7. 7. Cranial Bones • Frontal (1): Forms the forehead and the roofs of the eye sockets • Parietal (2): Form the sides and roof of the cranial cavity. • Occipital (1): Forms the back and the base of the cranium. Contains foramen magnum, the hole through which the spinal cord passes
  8. 8. Cranial Bones • Frontal (1): Forms the forehead and the roofs of the eye sockets • Parietal (2): Form the sides and roof of the cranial cavity. • Occipital (1): Forms the back and the base of the cranium. Contains foramen magnum • Temporal (2): Form the lower sides of the cranium. Contains the external auditory meatus (ear canal)
  9. 9. Cranial Bones • Frontal (1): Forms the forehead and the roofs of the eye sockets • Parietal (2): Form the sides and roof of the cranial cavity. • Occipital (1): Forms the back and the base of the cranium. Contains foramen magnum • Temporal (2): Form the lower sides of the cranium. Contains the external auditory meatus (ear canal) • Sphenoid (1): Spans the width of the cranial floor. Shaped like a butterfly
  10. 10. Cranial Bones • Frontal (1): Forms the forehead and the roofs of the eye sockets • Parietal (2): Form the sides and roof of the cranial cavity. • Occipital (1): Forms the back and the base of the cranium. Contains foramen magnum • Temporal (2): Form the lower sides of the cranium. Contains the external auditory meatus (ear canal) • Sphenoid (1): Spans the width of the cranial floor. Shaped like a butterfly • Ethmoid (1): Forms most of the bony area between the nasal cavity and the orbits. 3 parts: Cristagalli (triangular upper portion), Cribiform plate (contains olfactory foramina), and Perpendicular plate (forms part of nasal septum)
  11. 11. Cranial sutures • Sagittal suture: between the parietal bones
  12. 12. Cranial sutures • Sagittal suture: between the parietal bones • Coronal suture: between the frontal bone and the parietal bones
  13. 13. Cranial sutures • Sagittal suture: between the parietal bones • Coronal suture: between the frontal bone and the parietal bones • Lambdoid suture: between the occipital bone and the parietal bones
  14. 14. Facial Bones • Maxillae (2): Form the upper jaw, floor of the orbits, and roof of the mouth. Contains the upper teeth
  15. 15. Facial Bones • Maxillae (2): Form the upper jaw, floor of the orbits, and roof of the mouth. Contains the upper teeth • Palatine (2): L-shaped bones behind the maxillae. Form posterior part of hard palate
  16. 16. Facial Bones • Maxillae (2): Form the upper jaw, floor of the orbits, and roof of the mouth. Contains the upper teeth • Palatine (2): L-shaped bones behind the maxillae. Form posterior part of hard palate • Nasal (2): Form the bridge of the nose
  17. 17. Facial Bones • Maxillae (2): Form the upper jaw, floor of the orbits, and roof of the mouth. Contains the upper teeth • Palatine (2): L-shaped bones behind the maxillae • Nasal (2): Form the bridge of the nose • Lacrimal (2): Located in the medial walls of the orbits (eye sockets)
  18. 18. Facial Bones • Zygomatic (2): Cheek bones. Joins with the temporal bone to form the zygomatic arch
  19. 19. Facial Bones • Zygomatic (2): Cheek bones. Joins with the temporal bone to form the zygomatic arch • Inferior nasal conchae (2): Thin, curved bones that project into the nasal cavity
  20. 20. Facial Bones • Zygomatic (2): Cheek bones. Joins with the temporal bone to form the zygomatic arch • Inferior nasal conchae (2): Thin, curved bones that project into the nasal cavity • Vomer (1): Forms part of nasal septum
  21. 21. Facial Bones • Zygomatic (2): Cheek bones. Joins with the temporal bone to form the zygomatic arch • Inferior nasal conchae (2): Thin, curved bones that project into the nasal cavity • Vomer (1): Forms part of nasal septum • Mandible (1): Lower jaw. Articulates with the temporal bone at the temporomandibular (TMJ) joint. Contains the lower teeth and mental foramina
  22. 22. Other bones of the skull • Auditory ossicles: malleus, incus, and stapes. Tiny bones in the middle ear
  23. 23. Other bones of the skull • Auditory ossicles: malleus, incus, and stapes. Tiny bones in the middle ear • Hyoid bone: U-shaped bone in the neck. Functions as a base for the tongue. Only bone in the body that does not articulate directly with another bone
  24. 24. Sinuses • Air-filled cavities lined with mucous membranes. Reduce weight of skull
  25. 25. Sinuses • Air-filled cavities lined with mucous membranes. Reduce weight of skull • Located in the frontal, sphenoid, ethmoid, and maxillary bones

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