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Transcript
Chapter 12
Cranium
Part 1
Cranial Bones
• Skull = ___________________
• _______________ (8 bones)
– Area that surrounds and protects the brain.
– _______________________
– Floor
Calvaria
• _____________
• ___________ (Right and Left)
• ____________
Frontal Bone
• _______________ (Vertical) Portion
– Forehead
• _______________(Horizontal) Portion
– Superior Orbits
Frontal Bone
Squamous
• ________________
– Area between eyebrows
• ________________
– Depression above eyebrows
• _________________
– Superior rim of orbit
• __________________
– Ridge beneath eyebrow
Frontal Bone
Orbital
• __________________
– Superior portion of each orbit
• _________________
– Separates orbital plate
• Articulates with 4 _____________
– Right and left parietals, sphenoid, ethmoid
Parietal Bones
• Forms the ________________calvaria.
• Articulates with 5 ________________
– Frontal, occipital, temporal, sphenoid, parietal
Occipital Bone
• _______________ portion of the calvaria.
• Squamous Portion
• _______________________________
– Prominent bump on the back of head.
Occipital
• _________________
– Hole for spinal cord
• ____________________– Articulating surface on each side of foramen
magnum.
• Articulates with 6 bones
– 2 parietals, 2 temporals, sphenoid, atlas
Cranial Floor
• _______________ (Right and Left)
• _______________
• _______________
Temporal Bone
• Lateral aspect of skull.
• 3 Portions
– _____________
– _____________
– _____________
Temporal
Squamous Portion
• Vertical aspect and very thin.
• _______________________
– Articulates with Zygoma
– TMJ
Temporal
Mastoid Portion
• Posterior to ____________
• ___________________
• Mastoid Tip
Temporal
Petrous Portion
• ____________________________
• ___________________
– Petrous Ridges
• ______________________
– Opening for the nerves of hearing and equilibrium
• ____________Process
Sphenoid
• Centrally located. ______________cranial
bones.
• ____________________
– Houses __________________
– __________– Posterior wall of sella
– _____ – Depression posterior to dorsum sella.
– Posterior clinoid
– Anterior clinoid
Sphenoid
• _________________
– Anterior clinoid
• ________________
– Forms portion of floor and walls of cranium
Sphenoid
• ___________________
– Lateral downward projections
• ____________________
– Medial downward projections
• ___________________
– Process off of medial pterygoid
Sphenoid Foramen
• Foramen _____________
• Foramen ____________
• Foramen _____________
Sphenoid
Optic Components
• ____________________
– Groove between Anterior body and lesser wings
• ___________________
– Hole between anterior body and lesser wings
• ___________________
– Space lateral to optic foramen between lesser and
greater wings
Ethmoid Bone
• Small bone lying primarily below floor of
cranium.
• Articulates with 2 cranial bones.
• _________________
– Horizontal portion
• ________________
– Superior projection from cribiform plate into frontal
bone
More Ethmoid
• _________________
– Downward projection forms nasal septum
• ___________________
– Suspend from cribiform
• ___________________
– Downward projection from labyrinth
Sutures
• Areas of cranial fusion
– Synarthrodial
• _______________
– Fuses Parietal to Frontal bone
• _______________
– Fuses right and left Parietal
• ________________
– Fuses Parietal to Occipital
• _________________
– Fuses Parietal to Temporal
Fontanels
Membrane area as a Child
• Anterior
• Posterior
• Sphenoid (2)
• Mastoid (2)
Suture Articulations Adult
• _______________
– Frontal and parietals
• _______________
– Occipital and parietals
• _______________
– GW of sphenoid, temporal, parietal, frontal
• ________________
– Temporal, occipital, parietal