Skull

Question 1

Skull OF0

Answer 1

Position:

• Distance from lateral orbital margins and crista galli to lateral cranial cortices are equal
• Petrous ridges are superimposed over supraorbital margins
• Anterior clinoids and dorsum sellae are superior to ethmoid sinuses

Area:
-Outer cranial cortex and maxillary sinuses

Question 2

Skull OF20

Answer 2

Position:

• Distance from lateral orbital margins and crista galli to lateral cranial cortices are equal
• Petrous ridges are horizontally below inferior orbital margins

Area:
-Outer cranial cortex and maxillary sinuses

Question 3

Skull Lateral

Answer 3

Position:

• Sella turcica shown
• Orbital roofs, mandibular rami, greater wings of sphenoid, external acoustic canal, zygomatic bones, and cranial cortices are superimposed
• Posteroinferior occipital bones and posterior arch of atlas are not superimposed

Area: Outer cranial cortex

Question 4

Skull Townes

Answer 4

Position:

• Petrous ridges are symmetrical
• Dorsum sellae centered within foramen magnum
• Posterior clinoids and dorsum sellae are seen within foramen magnum and not superimposed by posterior arch of atlas

Area:
-Outer cranial cortex, petrous ridges, dorsum sellae and foramen magnum