Parts of the Eye Flashcards
At what level do we consider ocular movements?
- nuclear = the cranial nerves
- inter-nuclear = connection between CN 3,4,6
- supranuclear = gaze center (brodmann 8)
what is the sclera?
- outermost covering of the eye used to maintain the shape.
- The extraocular muscles are attached to it.
what is the cornea?
clear extension of the sclera
which layer of the eye is considered the vascular layer?
choroid
what is the choroid?
Layer underneath sclera containing blood vessels.
Front of choroid has two parts, which are they?
- Ciliary Body
- Iris
what is the ciliary body?
Determines shape of lens and produces aqueous humor.
what is the iris?
Adjustable diaphragm that surrounds the pupil. Constrictor and Dilator muscles.
which layer of the eye absorbs the scattered light?
Choroid
which structure in the eye contains the constrictor and dilator muscles?
the iris
what is the retina?
area that contains rods and cones.
which part of the eye contains the innermost layer?
the retina
what is the macula?
the center of the retina
what does the macula contain?
the fovea centralis
does the fovea centralis contain rods or cones?
cones
what structures make up the Optic disc?
do these structures go in or out?
CN II, veins, arteries
exit
what is the Optic or Physiological Cup?
Depression in the center of the Optic Disc.
what is the Aqueous Humor?
Watery fluid in the front section of the eye.
the Front section of the eye is divided into two parts:
- Anterior chamber
- Posterior chamber
where is the anterior chamber?
where is the posterior chamber?
in front of the iris
behind the iris
what is the Vitreous Humor?
Jelly-like fluid in the back part of the eye.
what strucutre allows you to see in black and white?
what strucutre allows you to see in color?
rods
cones
how many rods do you have?
how many cones do you have?
120million
60 million
what cells make up the optic nerve?
ganglion cells
