Eyes and Orbits Flashcards
Borders of the orbit
Roof: Frontal and sphenoid bones
Floor: Maxilla and zygomatic bones
Lateral: Zygomatic and sphenoid bones
Medial: Ethmoid, lacrimal, and maxilla bones
Action of superior oblique
Internal rotation, Depression, Abduction
Action of inferior oblique
Up and out
Action of recti muscles
Pull eye to that side
Location and contents of lacrimal fossa
Inferior medial edge, Lacrimal sac
Location and contents of optic canal
Lateral of the centre, Optic nerve
Location and contents of superior orbital fissure
Lateral of the optic canal; CN III, IV and VI; Lacrimal, Frontal, Nasocilary, and sympathetic nerves; Opthalmic veins
Describe the blood supply to the orbit
Opthalmic artery off of the internal carotid
Describe the venous drainage of the orbit
Drained by the superior and inferior opthalmic veins, Into the cavernous sinus
Location of the lacrimal gland
Upper lateral corner
Describe how lacrimal fluid is moved over the eye
By eyelid
Action and innervation of levator palpebrae superioris
Elevate the eyelid, Oculomotor
Action and innervation of smooth muscle of Muller
Some elevation of the eyelid, SNS
Action and innervation of orbicularis oculi
Close the eye, Facial
Describe a blow out fracture, Possible consequences, and weakest point
Seperation of a section of the orbit, Provides path for infection to the brain, Weakest inferiorly and medially
Consequences of paralysis of orbicularis oculi
Inability to spread lacrimal fluid, Increased infections
Consequences of paralysis of levator palpebrae superioris
Ptosis
