Orbit Flashcards
What happens in orbital blow out fractures
Increase in internal pressure in globe of eye causes blow out fracture of orbit
-orbital contents herniate into maxillary air sinus
What structures pass through the optic canal
Optic nerve
Opthalmic artery
What structures pass through the SOF
CN: III, IV, VI
V1 - lacrimal n, frontal n, nasociliary
Superior opthalmic vein
What structures pass through the IOF
V2:
- infraorbital
- zygomatic
Infraorbital artery and vein
Inferior ophthalmic vein
What passes through the infraorbital canal
Infraorbital nerve, artery and vein
What passes through the supraorbital foramen
Supraorbital nerve (lateral branch)
Supraorbital artery
What passes through the frontal incisure
Supraorbital nerve (medial branch)
Supratrochlear artery
What passes through the ant and post ethmoidal foramen
Anterior ethmoidal nerve, artery and vein
Posterior ethmoidal nerve, artery and vein
what is the insertion and action of the superior rectus
Anterior to coronal equator
Action:
-elevation
What is the action of medial rectus
adduction
What is the action and insertion of inferior rectus
Insertion: inferior surface of globe
-Depression
-
What is the action and insertion of superior oblique
Insertion: post to equator
Action
- abduct cornea
- intortion
- depression
What happens if superior rectus is damaged
No muscle can depress cornea when eye looks medially if superior oblique is lost
- LR can compensate for lost abduction
- IR - can compensate for lost depression
(if eye looks medially, IR doesn’t depress, it rotates)
What is the insertion point and action of inferior oblique
Insertion: behind coronal equator
Action
- abduction
- extortion
- elevation
What does the supratrochlear nerve supply
Skin and conjuncitva of upper eye lid
-branches of lacrimal n also di tgus
