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Chapter 7 Bones of the Cranium

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1 Chapter 7 Bones of the Cranium

2 Anatomical references
Process raised area / projection of bone Fossa low area / depressed area of bone Suture aka Fibrous joint Immovable joints of the skull Sinus aka (paranasal sinuses) (4 pair) hollow space in bone Makes mucus Contributes to the sound of your voice Makes bones lighter Foramen hole through bone Blood vessels and nerves pass through

3 Skull Bones 22 total Cranial bones. 8 of the ‘skull’ 14 of the ‘face’

4 Skull bones Frontal bone 1 bone Forms forehead Frontal sinus

5 Skull bones Parietal 2 bones Form the top sides of the skull fontanel
Aka ‘soft spot’ Where frontal bone and parietal join

6 Skull bones Occipital bone 1 bone
Forms the back and posterior base of the skull. Foramen magnum Largest foramen of the body Spinal cord passes through

7 Skull bones Sphenoid bone 1 bone Forms the anterior base of the skull
Lower anterior of the side of the skull Sphenoid sinus ‘bat wing’ shaped Sphenoid → (inferior)

8 Skull bones Ethmoid bone 1 bone Forms inner eye socket
Separates nasal cavity from brain Ethmoid sinus Many small sinuses Honeycomb Swiss cheese

9 Skull bones Temporal bone 2 bones Forms the lower sides of the head.
TMJ Temporomandibular joint Temporal bone articulates w/ the mandible Ears are attached

10 Temporal bone Landmarks Mastoid process Styloid process
External auditory meatus Temporal fossa Glenoid fossa Articular eminence

11 Facial bones Nasal bone Vomer bone Inferior nasal conchae 2 bones
Forms the bridge of the nose Vomer bone 1 bone Forms part of floor of nasal cavity Nasal septum attaches Inferior nasal conchae Divided into superior, middle and inferior

12 Facial bones Lacrimal bone 2 bones Forms outer part of the eye socket
Ethmoid bone forms the inner part of the eye socket. Tear ducts pass through

13 Facial bones Zygomatic bone Aka zygoma 2 bones Forms the cheek
Sides of the eye socket ‘cheek’ bones

14 Facial bones Maxilla 2 bones Forms the Largest of the facial bones
upper jaw face anterior of hard palate Largest of the facial bones

15 Facial bones Landmarks of the Maxilla Median palatine suture
Infraorbital foramen Incisive foramen Alveolar process Bone that supports the teeth Maxillary sinus

16 Facial bones Palatine bone 2 bones
Forms the posterior of the hard palate. Floor of the nasal cavity Transverse palatine suture Greater palatine foramen Lesser palatine foramina (plural)

17 Facial bones Mandible Landmarks Only moveable bone of the face.
Strongest bone 1 bone (starts as 2) ½’s join at the mandibular symphysis NO suture Landmarks Mental foramen Mandibular foramen Lingual foramen Ramus (rami) Condyloid process TMJ Alveolar process Retromolar area

18 Facial bones

19 TMJ Temporomandibular joint Landmarks Bony
Temporal bone articulates with the mandible. Synovial joint Hinge/glide action TMD Disorder / dysfunction Landmarks Bony Condyloid process Articular eminence Glenoid fossa Soft tissue Meniscus Articular disc Capsular ligament

20 TMJ

21 Conclusion Knowing the bones of the head, face, and skull is an important part of your job. Understanding the facial bones, their landmarks and how they relate to dentistry will make you more valuable to your dentist. Any questions???????

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