introduction to skull 2

Question 1

structures in anterior cranial fossa

Answer 1

-access to orbit and nasal cavity (Crista galli, cribriform plate)
- Superior orbital fissure
- optic canal

Question 2

nerve going through cribriform plate

Answer 2

olfactory nerve - CN1

Question 3

structures on anterior view of the ethmoid bone

Answer 3

• crista galli
• ethmoid cells
• middle concha
• perpendicular plate
• medial wall of orbit

Question 4

what bones does the sphenoid bone articulate with

Answer 4

• occipital
• frontal
• ethmoid
• vomer
• temporal
• parietal
• zygomatic
• palatine

Question 5

features of the sphenoid bone

Answer 5

body and 6 processes
- 2 lesser wings
- 2 greater wings
- 2 pterygoid processes (medial and lateral pterygoid plate)

Question 6

features of the sphenoid body

Answer 6

• sphenoidal crest
• anterior clinoid process
• posterior clinoid process
  Sella Turcica
• tuberculum sellae
• dorsum sellae
• hypophyseal fossa

Question 7

foramina of the sphenoid bone

Answer 7

• superior orbital fissure
• optical canal
• foramen rotundum
• foramen ovale
• foramen spinosum
• foramen lacerum

Question 8

how is the foramen lacerum formed

Answer 8

convergence of sphenoid, temporal and occipital
- also covered in cartilage

Question 9

location of superior orbital fissure

Answer 9

cleft between greater and lesser wings of sphenoid bone
- in middle cranial fossa

Question 10

location of optical canal

Answer 10

• passes through lesser wing of sphenoid
• medial to anterior clinoid process
• medial to superior orbital fissure
  lateral to body of sphenoid
• in middle cranial fossa

Question 11

what does the optic canal communicate with

Answer 11

the orbit

Question 12

location of foramen rotundum

Answer 12

• pass through greater wing of sphenoid
  -in middle cranial fossa
• runs anterior/horizontal
• opens into pterygopalatine fossa ( bony formation of sphenoid, maxilla, palatine bones)

Question 13

location of foramen ovale and spinosum

Answer 13

• pass through greater wing of sphenoid
  -in middle cranial fossa
• runs anterior/horizontal
• opens inferiorly into infratemporal fossa

Question 14

what passes through the optical canal

Answer 14

optical nerve - CN 2

Question 15

what passes through the superior orbital fissure

Answer 15

• oculomotor nerve –> CN 3
• trochlear nerve –> CN 4
• trigeminal nerve –> CN 5, branch 1
• abducens nerve –> CN 6