what are the borders of the ant. chamber?
cornea to iris
what is inside the ant chamber?
intraocular fluid; canal of schemm
what are the borders of the post. chamber?
iris to vitreous chamber
what is inside the posterior chamber?
fluid, lens, zonular fibers, ciliary muscle
what is the largest chamber of the eye?
vitreous chamber (2/3 of total volume, contains vitreous gel)
what are the two muscles that control the iris?
pupillary constrictor muscle (parasympathetic control) and pupillary dilator muscle (sympathetic control)
the lens is under ______________ control.
parasympathetic control
what are the layers of the retina (4 of 'em)
1. retinal pigmented epithelium 2. photoreceptors 3. interneurons 4. retinal ganglion cell layer
what part of the retina lacks photoreceptors and is considered the "blind spot"?
optic disk!
what part of the retina lacks blood vessels?
macula and fovea
the macula and fovea are where ______________ is focused
the center of vision
cones perceive: a. black and white b. color
b. color
rods perceive: a. black and white b. color
a. black and white
what do the interneurons of the retina do?
communicate between photoreceptor and retinal ganglion cell also: begin process of contrast detection
what are the 4 targets of retinal ganglion cells?
1. Tiny # go to "master clock of brain" - to suprachiasmic nuc. of hypothalamus (DONT GO PAST OPTIC CHIASM) 2. 2-3% to pre-tectal nucleus of MIDBRAIN 3. 2-3% to superior colliculus of MIDBRAIN 4. 90% to lateral geniculate nucleus of THALAMUS
true or false: the only fibers to cross the optic chiasm are the nasal fibers
TRUE!
the optic nerve is before or after the optic chiasm?
BEFORE
the optic tract is before or after the optic chiasm?
AFTER
a cut at the right optic nerve would cause ___________ in the __________ (R or L) eye.
blindness in the RIGHT eye
a cut at the optic chiasm would cause ___________ (binasal or bitemporal) hemianopsia
bi temporal
where do MOST of the retinal ganglion axons synapse?
lateral geniculate nucleus of thalamus
from the LGN, some fibers go below the lateral ventricle through the white matter of the ________ lobe, and synapse in the __________ gyrus
temporal, lingual
from the LGN, some fibers go above the lateral ventricle through the white matter of the _________ lobe, and synapse in the _________ gyrus
parietal, cuneus
Myers loop is associated with fibers traveling through which lobe?
white matter of temporal lobe
what is the rule of 3 Ls and pie in the sky?
the LOWER retinal fields travel through Myers LOOP and synapse in the LINGUAL gyrus, leading to a superior quadrantanopsia
