Visual System Anatomy (2) Flashcards
What is the cornea involved in?
Light refraction
What is the sclera?
Outer layers of posterior 5/6 of eye
What is the iris?
Colored part of eye (smooth muscle)
What does the pupil regulate?
Amount of light entering the eye
Where is the lens suspended?
Between anterior and posterior chamber
What are the posterior and anterior chambers called?
Aqueous humor
What do the suspensory ligaments do?
Connect to the lens and help suspend it in place
Where do the iris and suspensory ligaments attach?
Ciliary body
What is the vascular layer of the eye called?
Choroid
What is contained in the fibrous tunic?
Sclera and cornea
What is contained in the vascular tunic?
Choroid, ciliary body, and iris
What is contained in the nervous tunic?
Retina
Where does the optic nerve send info to?
Optic chiasm
What is the optic disc?
Back of the eye where axons are exiting the retina to form the optic nerve
Why is the optic disc considered a blind spot?
It has no photoreceptors
What happens to an image as it enters through the retina?
It is inverted and reversed
Where does info from the upper visual space go to?
Lower retina
Where does info from the lower visual space go to?
Upper retina
Where does central fixation for each eye fall on to?
Fovea
What does the retina contain?
Photoreceptors (rods and cones)
Where is the retina located?
Outermost layer furthest away from lens
What do photoreceptors respond to?
Light
Where do photoreceptors synapse at?
Ganglion cells
What are more numerous between rods and cones?
Rods (20:1)
