Cranium

1
Chapter 12

• Cranium
• Part 1

2
Cranial Bones

• Skull ___________________
• _______________ (8 bones)
• Area that surrounds and protects the brain.
• _______________________
• Floor

3
Calvaria

• _____________
• ___________ (Right and Left)
• ____________

4
Frontal Bone

• _______________ (Vertical) Portion
• Forehead
• _______________(Horizontal) Portion
• Superior Orbits

5
Frontal BoneSquamous

• ________________
• Area between eyebrows
• ________________
• Depression above eyebrows
• _________________
• Superior rim of orbit
• __________________
• Ridge beneath eyebrow

6
Frontal BoneOrbital

• __________________
• Superior portion of each orbit
• _________________
• Separates orbital plate
• Articulates with 4 _____________
• Right and left parietals, sphenoid, ethmoid

7
Parietal Bones

• Forms the ________________calvaria.
• Articulates with 5 ________________
• Frontal, occipital, temporal, sphenoid, parietal

8
Occipital Bone

• _______________ portion of the calvaria.
• Squamous Portion
• _______________________________
• Prominent bump on the back of head.

9
Occipital

• _________________
• Hole for spinal cord
• ____________________-
• Articulating surface on each side of foramen
  magnum.
• Articulates with 6 bones
• 2 parietals, 2 temporals, sphenoid, atlas

10
Cranial Floor

• _______________ (Right and Left)
• _______________
• _______________

11
Temporal Bone

• Lateral aspect of skull.
• 3 Portions
• _____________
• _____________
• _____________

12
Temporal Squamous Portion

• Vertical aspect and very thin.
• _______________________
• Articulates with Zygoma
• TMJ

13
Temporal Mastoid Portion

• Posterior to ____________
• ___________________
• Mastoid Tip

14
Temporal Petrous Portion

• ____________________________
• ___________________
• Petrous Ridges
• ______________________
• Opening for the nerves of hearing and equilibrium
• ____________Process

15
Sphenoid

• Centrally located. ______________cranial bones.
• ____________________
• Houses __________________
• __________ Posterior wall of sella
• _____ depression posterior to dorsum sella.
• Posterior clinoid
• Anterior clinoid

16
Sphenoid

• _________________
• Anterior clinoid
• ________________
• Forms portion of floor and walls of cranium

17
Sphenoid

• ___________________
• Lateral downward projections
• ____________________
• Medial downward projections
• ___________________
• Process off of medial pterygoid

18
Sphenoid Foramen

• Foramen _____________
• Foramen ____________
• Foramen _____________

19
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

20
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

21
More Ethmoid

• _________________
• Downward projection forms nasal septum
• ___________________
• Suspend from cribiform
• ___________________
• Downward projection from labyrinth

22
Sutures

• Areas of cranial fusion
• Synarthrodial
• _______________
• Fuses Parietal to Frontal bone
• _______________
• Fuses right and left Parietal
• ________________
• Fuses Parietal to Occipital
• _________________
• 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
• _______________
• GW of sphenoid, temporal, parietal, frontal
• ________________
• Temporal, occipital, parietal