Eye Flashcards
Lens is _______ tissue
cellular
The lens is (avascular/vascular)
vascular
What is the function of the ciliary body?
Contacts and changes the shape of the lens to allow for up close vision
Sclera is continuous with _______.
meninges
Retina is continuous with _______.
optic nerve
The optic nerve has how many layers?
two
What developing structures do hyaloid vessels supply?
retina and lens
Hylaloid vessels get to the retina and lens via the ________.
ventral cleft
What is a Coloboma?
Retention of the ventral cleft (ventral cleft left behind)
Coloboma gives the appearance of a _______.
keyhole pupil
What structure can coloboma involve?
iris or whole sclera
Both layers of the optic cup form the _______.
retina
inside layer of the optic cup is the _______ retina.
visual
outside layer of the optic cup is the ________ retina.
pigmented
What is the function of the pigmented retina?
Absorb light to make vision more acute
______ forms conjunctival sacs (insides of eyelids).
surface ectoderm
Eyelids _____ with each other during development and _____ closer to birth.
fuse, open
Right before and after birth lens receives nourishment via ______.
diffusion from vitreous and aqueous humor
The part of the hyaline artery in the eyeball ________ right before birth.
disappears
The ______ becomes the central artery of the retina.
hyaline artery
Where is the central artery of the retina located?
In the middle of the optic nerve
How is the optic nerve different from the other cranial nerves?
it is a brain fiber tract surrounded by meninges and CSF
The _______ surrounds the optic nerve.
meninges
How does an increase in intracranial pressure affect there eye?
Increase in intracranial pressure due to increase in CSF puts pressure on the optic nerve, central artery and vein of retina.
What is the embryologic basis of a detached retina?
The two layers of the optic cup never tightly fuse.
The _________ of the eye pushes the visual retina against the pigmented retina.
vitreous humor
What can cause the pigmented retina to separate from the visual retina? What happens to the visual field because of this?
a blow to the head, its like a black curtain is covering part of that person’s visual field
The cornea is what type of tissue?
dense connective
Cornea is continuous with ______ and ______
sclera, dura mater
Choroid is continuous with _____ and ______
arachnoid, pia mater
sclera is covered with _______
conjuctiva
What will happen if you lose the central artery of the retina?
blindness
_______ fibers make up the cornea.
Collagen
What gives the vitreous humor and aqueous humor a gelatinous consistency?
hylauronic acid
The aqueous humor provides nutrition for the _______ and _______.
cornea, lens
What allows light to pass through the cornea?
the alignment of its collagen fibers
Aqueous humor is produced by the _________.
ciliary body
Aqueous humor gets back in the bloodstream via the __________.
canal of schlemm
Glaucoma is _________ pressure in the __________.
increased, aqueous humor
What is the effect of increased pressure in the aqueous humor?
glaucoma
impacts the vitreous humor which affects the retina leading to possible blindness