Eye Flashcards
Three layers of eyeball
1) fibrous tunic
2) vascular tunic
3) neural tunic
Fibrous tunic
Most superficial layer of eyeball that serves solely to protect
1) sclera
2) cornea
Sclera
Covers posterior 5/6 of the eyeball
Cornea
Covers anterior 1/6 of eyeball.
Clear
Conjunctiva
Very thin membrane that covers cornea
Vascular tunic
Middle layer of eyeball made of:
1) choroid
2) ciliary body
3) iris
Choroid
Deep to sclera. Dark purple layer that traps incoming light
Nourishes inner layers
Ciliary body
Thickened anterior portion surrounding lens
Contains ciliary muscle and ciliary processes
Ciliary processes
Protrusions of ciliary body
Ora serrata retina
Posterior “serrated” edge where ciliary muscle and retina meet
Iris
Colored part of eyeball that regulates amount of light that can entire pupil
Neural tunic
Also called retina
Neuron rich membrane that lines posterior 2/3 of eyeball
What type of neurons are abundant in retina?
Bipolar neurons
Axons of retinal neurons converge at…?
Blind spot (optic disc)
Retinal neurons exit eyeball as..?
Cranial nerve 2
The optic nerve m
Optic nerve
Extension on back of eye
Lens
Clear connective tissue behind the iris
Focuses for vision through contraction of ciliary muscles
Suspensory ligaments
Anchors lens to ciliary muscle
White strands around lens
Cavities of eye:
Posterior cavity
Anterior cavity
Posterior cavity
Large open space in eye that extends from retina and lens
Gel that fills posterior cavity
Vitreous humor
Anterior cavity
Area between lens and cornea
Separates into anterior chamber and posterior chamber
Watery fluid that fills anterior cavity
Aqueous humor
Anterior chamber of anterior cavity
Located between cornea and iris
Posterior chamber of anterior cavity
Located between iris and lens
Tiny triangular cavity
