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Understanding the Cranial Bones in the Skull

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Explore the anatomy of the cranium, including the frontal, parietal, occipital, temporal, sphenoid, and ethmoid bones. Learn about their functions, articulations, and key features in protecting the brain.

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Understanding the Cranial Bones in the Skull

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  1. Chapter 11 Cranium Part 1

  2. Cranial Bones • Skull = __________ and ________ bones • Cranium (8 bones) • Area that surrounds and protects the brain. • ____________ (Skull Cap) • Floor

  3. Calvarium • __________ • Parietal (Right and Left) • __________

  4. Frontal Bone • ____________ (Vertical) Portion • Forehead • ___________ (Horizontal) Portion • Superior Orbits

  5. Frontal BoneSquamous • ___________ • Area between eyebrows • _____________ Groove • Depression above eyebrows • ______________margin • Superior rim of orbit • _____________ ridge (Arch) • Ridge beneath eyebrow

  6. Frontal BoneOrbital • _____________plate • Superior portion of each orbit • _______________ Notch • Separates orbital plate • Articulates with 4 cranial bones • Right and left parietals, sphenoid, _________

  7. Parietal Bones • Forms the __________calvarium. • Articulates with 5 cranial bones • Frontal, occipital, temporal, sphenoid, parietal

  8. Occipital Bone • ___________portion of the calvarium. • Squamous Portion • _______________Protuberance (Inion) • Prominent bump on the back of head.

  9. Occipital • ____________Magnum • Hole for spinal cord • _______________ condyles • Articulating surface on each side of foramen magnum. • Articulates with 6 bones • 2 parietals, 2 temporals, sphenoid, ________

  10. Cranial Floor • Temporal (Right and Left) • __________ • Ethmoid

  11. Temporal Bone • Lateral aspect of skull. • 3 Portions • ___________ • ___________ • ___________

  12. Temporal Squamous Portion • Vertical aspect and very thin. • _______________ • Articulates with Zygoma • ____________

  13. Temporal Mastoid Portion • Posterior to ___________ • _____________ • Mastoid Tip

  14. Temporal Petrous Portion • Houses hearing and equilibrium • _______________ • Petrous Ridges • _______________Meatus • Opening for the nerves of hearing and equilibrium • ________________

  15. Sphenoid • Centrally located. Anchors all 7 cranial bones. • _______________(Turk’s Saddle) • Houses _______________ • __________sellae– Posterior wall of sella • _____ – Depression posterior to dorsum sella. • Posterior clinoid • Anterior clinoid

  16. Sphenoid • ___________ Wings • Anterior clinoid • ___________ Wings • Forms portion of floor and walls of cranium

  17. Sphenoid • Lateral ______________ • Lateral downward projections • Medial ________________ • Medial downward projections • ___________ hamuli • Process off of medial pterygoid

  18. Sphenoid Foramen • Foramen ____________ • Foramen ____________ • Foramen ____________

  19. Sphenoid Optic Components • Optic __________ (Chiasm) • Groove between Anterior body and lesser wings • Optic ___________ • Hole between anterior body and lesser wings • Superior ______________ • Space lateral to optic foramen between lesser and greater wings

  20. Ethmoid Bone • Small bone lying primarily below floor of cranium. • Articulates with 2 cranial bones. • ____________ • Horizontal portion • ____________ • Superior projection from cribriform plate into frontal bone

  21. More Ethmoid • _________________ plate • Downward projection forms nasal septum • Lateral _____________ (masses) • Suspend from cribiform • Nasal ___________(Turbinates) • Downward projection from labyrinth

  22. Sutures • Areas of cranial fusion • Synarthrodial • __________ suture • Fuses Parietal to Frontal bone • ___________suture • Fuses right and left Parietal • __________suture • Fuses Parietal to Occipital • __________ suture • Fuses Parietal to Temporal

  23. Fontanels Membrane area as a Child • Anterior • Posterior • Sphenoid (2) • Mastoid (2)

  24. Suture Articulations Adult • ____________ • Frontal and parietals • ____________ • Occipital and parietals • ___________ Rt/Lt • GW of sphenoid, temporal, parietal, frontal • ___________ Rt/Lt • Temporal, occipital, parietal

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