Orbit II Flashcards
primary refractor of light
cornea
secondary refractor of light
lens
3 layers of eye
Sclera
Choroid (w/ blood vessels and nerves)
Retina
What creates aqueous humor?
ciliary processes
Drainage of eye
canal of Schlemm
Blockage of trabecular network
glaucoma. pressure builds can’t drain
2 types of glaucoma
open angle
angle closure
how do you actively dilate the iris?
dilator pupillae (via sympathetic ns)
Ciliary muscle and sphincter pupillae are both
circular and parasymp
Sympathetic muscles (dilator pupillage) in iris are
radially oriented
10-12 feet away (Far away refraction)
cornea
looking at things up close
need to thicken lens up, so that light falls on back on retina
Meridional fibers
counteract circular fibers
Nuclei of lens and age?
decrease with age
The ciliary muscle is innervated by
parasympathetic only (causes lens to THICKEN)
Postremal chamber
vitreous humor. also there’s the hyaloid canal.
cells spaning inner to outer limiting membrane
mueller cells
what layer is touching VB
inner limiting membrane
how do rods/cons get metabolic support?
not from mueller cells. pigmented epithelium blood supply. this is where detached retina happens.
3 differences between rods and cones
- surface area difference (check)
- shape like cone
- cone has wide foot (synaptic bouton)
when is the 1st AP in eye?
ganglion cells. not rods/cons.
fewest number of neurons to get to ganglion is
3
only cones here
fovea
no blood vessels where
fovea
