Skull

Question 1

Name the bones of the skull.

Answer 1

Frontal
Parietal
Occipital
Temporal
Zygomatic
Mandible
Sphenoid
Maxilla
Ethmoid
Nasal

Question 2

Name the bones of the orbit.

Answer 2

Roof: frontal B. and lesser wing of the sphenoid B.

Floor: perpendicular plate of the palatine B, orbital surface of the maxilla B., and the zygomatic B.

Medial Wall: frontal process of the maxilla B., lateral mass of the ethmoid B., and the lacrimal B.

Lateral Wall: zygomatic process of the frontal B., greater wing of the sphenoid B., and the orbital surface of the zygomatic B.

Question 3

What are the four fontanelles of the fetal skull?

Answer 3

Anterior, Sphenoid, Mastoid, and Posterior fontanelles

Question 4

What bones are involved in the anterior fontanelle?

Answer 4

both frontal bones and both parietal bones

Question 5

What bones are involved in the sphenoid fontanelle?

Answer 5

frontal bones, parietal bone, sphenoid bone and temporal bone

Question 6

What bones are involved in the mastoid fontanelle?

Answer 6

parietal bone, occipital bone and temporal bone

Question 7

What bones are involved in the posterior fontanelle?

Answer 7

2 parietal bones and the occipital bone

Question 8

Blue Box: What is a Le Fort I Fx?

Answer 8

• horizontal Fx of the maxilla
• passes superior to the maxillary alveolar process
• crosses the bony nasal septum
• possibly involves the pterygoid plates of the sphenoid

Question 9

Blue Box: What is a Le Fort II Fx?

Answer 9

• passes from the posterolateral part of maxillary sinus
• superomedially through the infraorbital foramen
• goes to bridge of nose
• entire cental part of face separated from cranium

Question 10

Blue Box: What is a Le Fort III Fx?

Answer 10

• horizontal fx passes through the superior orbital fissure
• passes through ethmoid and nasal bones
• extends laterally through greater wings of sphenoid
• extends through frontozygomatic sutures

-fx of zygomatic arches causes maxillae and zygomatic bones to separate from cranium

Question 11

Blue Box: Surgical Access to Cranial Vault and Bone Flaps

Answer 11

• the periosteum has poor osteogenic properties
• bone is wired/plated while healing
• heals best when flap incorporates overlying tissue