335 6.1 The Skull

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shanamd2010
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136469
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335 6.1 The Skull
Updated:
2012-02-20 12:06:48
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Skull Bones
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Skull Bones
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  1. # of bones of skull
    22 irregular shaped bones
  2. sutures of the skull
    • sagittal
    • coronal
  3. other characteristics of the skull
    • cranial and facial skeletons
    • orbits
    • nasal cavity
    • zygomatic arch
  4. bones of the cranial skeleton
    • 1 frontal
    • 2 parietal
    • 2 temporal
    • 1 occipital
    • Sphenoid
    • Ethmoid
  5. frontal bone forms
    fore head and anterior part of the top of the cranium
  6. frontal bone landmarks
    • supraorbital portion - superior surface of the eye sockets
    • zygomatic processes - point of articulation with zygomatic bones
    • coronal suture - unites the frontal bones with the paired parietal bones posteriorly
  7. frontal bone articulates with
    • maxilla
    • nasal bone
    • lacrimal bones
    • zygomatic bones
    • ethmoid
    • parietal bones
    • sphenoid
  8. maxilla bones
    cheeks
  9. nasal bone
    bridge of nose
  10. lacrimal bones
    • inner eye bones
    • refers to tears
  11. parietal bones
    paired, top side of cranium
  12. parietal bones landmarks
    • sagittal suture - joins two parietal bones to one another
    • coronal suture - united frontal bone with parietal bones
    • squamous suture - joins temporal bones
    • lambdoidal suture - occipital bone
    • wormian bones - bifurcation of lambdoidal suture (not everyone has this)
  13. parietal bones
    each articulates with
    • opposite parietal bone
    • occipital
    • 1 temporal bone
    • frontal
    • sphenoid
  14. temporal bones
    lower side of cranium and part of the floor
  15. temporal lobe landmarks
    • squamous portion - fan shaped and thin portion; lower portion includes roof of the external auditory meatus
    • zygomatic process - projections that articulates with zygomatic bone
    • styloid process - bone extending down and forward; neck muscles and ligaments attach here
    • petrous portion - forms center section of cranial floor; very hard process which houses middle and inner ear structures
    • mastoid process - protuberance behind ear
  16. temporal bones
    each articulates with
    • occipital
    • 1 parietal bone
    • sphenoid
    • 1 zygomatic bone
    • mandible
  17. occipital bone
    posterior braincase
  18. occipital bone landmarks
    • foramen magnum - hole through which spinal cordc enters cranial cavity
    • condyles - processes on ethier side of foramen magnum; articulate with the first cervical vertebra (Atlas)
    • basilar portion - articulates with sphenoid bone
  19. occipital bone
    articulates with
    • parietal bones
    • temporal bones
    • sphenoid
    • Atlas
  20. sphenoid bone
    • in center of the skull
    • keystone of cranial floor
    • bat wing shaped
  21. sphenoid bone landmarks
    • greater wings - lateral projections from body; form outer wall; articulate with frontal and temporal bones
    • lesser wings - thin projections; form posterior part
    • pterygoid processes - downward projections off of greater wings; form part of lateral nasal wall
    • sella turcica - saddle-shaped depression; contains pituitary gland
    • hamulus processes - projection off of medial pterygoid plate
    • optic foramen - transmits optic nerve (CN II)
    • superior orbital fissure - slitlike opening
    • foramen rotundum - maxillary branch of CN V
    • foramen ovale - mandibular branch of CN V
    • foramen spinosum - middle meningeal artery
  22. pterygoid processes
    • medial (pterygoid plate) inner portion
    • lateral (pterygoid plate) outer projection
  23. superior orbital fissure
    transmits CN III, IV, and part of V and VI
  24. sphenoid bone
    articulates with
    • frontal
    • parietal bones
    • temporal bones
    • occipital
    • ethmoid
    • palatine bones
    • vomer
    • zygomatic bones
  25. bones that DO NOT articulate one another
    frontal bones and temporal bones
  26. ethmoid bone
    • forms anterior cranial base
    • lies anterior to sphenoid and posterior to nasal bones
  27. ethmoid bones landmarks
    • crista galli - protrudes into cranial space; meninges attach here
    • perpendicular plate - projection downward; makes up superior nasal septum
    • nasal conchae - superior; middle; form lateral walls of nose
    • cribiform plate - olfactory nerves pass through numerous holes in this plate; separates nasal and cranial cavities
  28. ethmoid bone
    articulates with
    • frontal
    • vomer
    • sphenoid
    • nasal bone
    • maxilla bones
    • lacrimal bone
    • palatine bones
    • inferior nasal conchae (2 separate bones)

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