1. Cranial Bones
Mrs. Donohue

2. How many cranial bones are there?
Eight
Function?
Enclose & protect brain & sensory organs
What joins the bones together?
sutures

3. Name of the cranial bones
Use a colored pencil for each bone
1 frontal bone
2 parietal bones
2 temporal bones
1 sphenoid bone
1 occipital bone
1 ethmoid bone
Cranial bones come into contact with the brain

4. Frontal bone
Anterior
forehead

5. 2 Parietal Bones 2 parietal bones meet at the sagittal suture
Looking top down
2 parietal bones meet at the sagittal suture

6. 2 temporal bones Form lower sides by the ear
Associated with the mastoid process
Temporal means “time”

7. 1 Sphenoid bone Supports & houses the pituitary gland
“Turk’s saddle” or sella turica
On floor of cranium

8. Sphenoid bone

9. 1 occipital bone Back and most of the base
Fastened to the parietal bone by lamboid suture

10. 1 ethmoid bone
Between orbits
Form roof of the nasal cavity & septum

11. Ethmoid Bone

12. Sutures
coronal
squamous
lamboidal
sagittal

13. Bone Architecture: Process
Any prominence or protrusion
Mastoid process
External occipital protrusion

14. Condyle Rounded prominence seen at an articulation
Occipital condyle articulate with atlas or C1 – cervical vertebrae #1

15. Alveolus
Tooth socket

16. Fissure
Slit-like passageway

17. Foramen
Hole of any size
Foramen magnum
Mental foramen

18. Meatus External & internal auditory canals
Spaces between the nasal conchae

19. ramus
A branch
A branch on the mandible

20. Temporal Bones & Their Parts
Mastoid process-knob behind the ear – contains sinuses
Squamous suture: flat plate
Tympanic-ear canal
Petrous

21. Zygomatic Process
part of the temporal bone that articulates with the temporal joint

22. Petrous Floor of the cranium
Make the structures of the middle & inner ear

23. Clinical Significance - Mastoiditus
See in middle ear infections
Hard to treat because it is made of spongy bone
Antibiotics can’t get there through the blood stream easily

24. Clinical Significance – TMJ temporomandibular joint -jaw
Process opens and shuts mouth-jawbone controlled by the TMJ
Joint where the lower jaw (mandible) joins temporal bone
Can become dislocated
Can cause head & neck pain