Eye Histology Flashcards
what are the three parts of the uvea?
choroid
iris and ciliary body
what types of collagen exist in the cornea?
type I and IV
what are the two muscles in the iris?
contrictor pupillae and dilator pupillae
what muscle is on the ciliary body
ciliary muscle
what is action of the ciliary muscle?
contrict ciliary body and relax tension on lens to allow for lens accomodation
what nerve stimulates the ciliary muscle
the CNIII
what happens to shape of lens when accommodation occurs?
rounder in shape…
when do you want lens accommodation?
when you are using close vision
chronic glaucoma leads to what loss of vision?
peripheral loss of vision
what type of protein is in the lens of the eye?
crystalline protein
what is lost in lens cells of the eye?
no organelles in the cells
what syndrome is associated with a dislocated lens?
marfan syndrome
what cell layer in retina is closest to optic nerve layer?
ganglion cell layer
optic nerve fibers synapse with what cell immediately in the retina?
ganglion cells
what layer of retina do rod and cones exist
photoreceptor layer
cones see what?
color
rods see what?
dark light
what is the deepest layer of the retina called?
retinal pigment epithelium
rods are sensitive to low or high light?
low light
what cells do rods synapse with? one or many?
bipolar neurons…many
cones are sensitive to high or low intensity light
high
what is more numerous, rods or cones?
rods
what cells do cones synapse with? one or many?
bipolar neurons too…only one though
name the cell types moving from optic nerve to rods/cones
optic nerve…ganglion cell…bipolar/horizontal/amacrine cell…rod/cone
what are most ganglion cells used for?
light transmission of information
what are 3% of ganglion cells used for?
directly connected to pineal gland and help in diurnal function
central retinal artery occlusion leads to what on fundoscopy?
cherry red spot at macula
what is usual cause of central retinal artery occlusion?
atherosclerosis
what vision is lost with detachment of the retina?
loss of peripheral vision
what is retinitis pigmentosa?
inherited disorder of photoreceptors
what is vision change in retinitis pigmentosa?
tunnel vision..night blindness
