Eye Flashcards
what can a lesion of the optic nerve result in?
papillodema
how can an infection in the eye lead to meningitis?
because the optic nerve is surrounded by meningial layers, and therefore can spread backwards into the brain and meninges
what can raised icp result in in the eye?
examptholos
papilloedema
blindness due to compression of the arterial supply
explain the structure of the optic nerve
surrounded by dura and pia matter
1.2m axons
central artery and vein
what can you use to remember the innervation of the eye muscles?
LR6SO4R3
what is the blood supply to the eye?
central artery of the retina
opthalmic artery
infraorbital artery
what is the venous drainage of the eye?
superior and inferior orbital veins
superior drains into the cavernous sinus
inferior drains into the pterygoid plexus
central artery of the retina
if the arterial supply to the eye were to be cut off, what would happen?
instant blindness
if the venous drainage of the eye was compromised, what would happen?
a slower loss of vision
what is significant about the venous supply to the eye?
embolism
infection
–>to brain
what is the function of the lacrimal gland?
to secrete lacrimal fluid into the eye to lubricate, protect and deliver o2 to the eye
where is the lacrimal gland?
it is in the superolateral eye
what delivers lacrimal secretions to the eye?
lacrimal ducts
what does the lacrimal canaliculi do?
drains the lacrimal pool into the lacrimal sac in the nose
what is the nasolacrimal duct?
where the lacrimal sac drains into to enter the inferior meatus to allow swallowing of the fluid
