Orbital Anatomy

Question 1

What bones make up the medial orbital wall?

Answer 1

orbital plate of the ethmoid bone, lacrimal bone, frontal process of maxillary bone, lesser wing of sphenoid

Question 2

What structures does the frontoethmoidal suture mark?

Answer 2

approximate level of cribriform plate, roof of ethmoids, floor of anterior cranial fossa, entry of anterior and posterior ethmoidal arteries into orbit

Question 3

What marks the medial wall of the optic canal?

Answer 3

lesser wing of sphenoid

Question 4

which bone exists wholly within the orbital confines?

Answer 4

lacrimal bone

Question 5

What are the two thinnest regions of orbit, which are also the most frequently fractured?

Answer 5

lamina propecia (between orbit and ethmoid sinus) and maxillary bone (esp. postero-medially)