Fissues and Foramina of the Head

Question 1

Structures passing through the optic canal

Answer 1

Opthalmic artery

Optic nere

Question 2

Bones making up the optic canal

Answer 2

Opens into middle cranial fossa

Medial: body of sphenoid

Lateral: lesser wing of sphenoid

Question 3

Structures passing through the superior orbital fissure

Answer 3

Opens into middle cranial fossa

1) Superior branch of oculomotor nerve CN III
2) Inferior branch of oculomotor nerve CN III
3) Trochlear nerve IV
4) Abducent nerve VI

5) Lacrimal branch of opthalmic nerve V1 of CN V
6) Frontal branch of opthalmic nerve V1 of CN V
7) Nasociliary branch of opthalmic nerve V1 of CN V

8) Superior opthalmic vein

Question 4

Structures passing through the inferior orbital fissure

Answer 4

Maillary nerve V2

Zygomatic branch of maxillary nerve

Infra-orbital vessels

Vein communicating with pterygoid plexus of veins

Question 5

Borders of the infeior orbital fissure

Answer 5

Greater wing of sphenoid

Maxilla

Palatine

Zygomatic

Question 6

Inferior orbital fissure allows communication between which structures

Answer 6

Orbit and pterygopalatine fossa posteriorly

Orbit and infratemporal fossa in the midline

Orbit and temporal fossa posterolaterally

Question 7

Contents of the infra-orbital foramen

Answer 7

Infra-orbital nerve which is a branch of the maxillary nerve V2 of the trigeminal nerve

Question 8

Structures making up the infra-orbital formane

Answer 8

Beginning in inerior orbital fissure

Continuation of infra-orbital groove

Which then continues as infra-orbital canal

Opens up into infra-orbital foramen