Lecture #1 vision shit

Question 1

what are the borders of the ant. chamber?

Answer 1

cornea to iris

Question 2

what is inside the ant chamber?

Answer 2

intraocular fluid; canal of schemm

Question 3

what are the borders of the post. chamber?

Answer 3

iris to vitreous chamber

Question 4

what is inside the posterior chamber?

Answer 4

fluid, lens, zonular fibers, ciliary muscle

Question 5

what is the largest chamber of the eye?

Answer 5

vitreous chamber (2/3 of total volume, contains vitreous gel)

Question 6

what are the two muscles that control the iris?

Answer 6

pupillary constrictor muscle (parasympathetic control) and pupillary dilator muscle (sympathetic control)

Question 7

the lens is under ______________ control.

Answer 7

parasympathetic control

Question 8

what are the layers of the retina (4 of ‘em)

Answer 8

1. retinal pigmented epithelium 2. photoreceptors 3. interneurons 4. retinal ganglion cell layer

Question 9

what part of the retina lacks photoreceptors and is considered the “blind spot”?

Answer 9

optic disk!

Question 10

what part of the retina lacks blood vessels?

Answer 10

macula and fovea

Question 11

the macula and fovea are where ______________ is focused

Answer 11

the center of vision

Question 12

cones perceive: a. black and white b. color

Answer 12

b. color

Question 13

rods perceive: a. black and white b. color

Answer 13

a. black and white

Question 14

what do the interneurons of the retina do?

Answer 14

communicate between photoreceptor and retinal ganglion cell also: begin process of contrast detection

Question 15

what are the 4 targets of retinal ganglion cells?

Answer 15

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

Question 16

true or false: the only fibers to cross the optic chiasm are the nasal fibers

Answer 16

TRUE!

Question 17

the optic nerve is before or after the optic chiasm?

Answer 17

BEFORE

Question 18

the optic tract is before or after the optic chiasm?

Answer 18

AFTER

Question 19

a cut at the right optic nerve would cause ___________ in the __________ (R or L) eye.

Answer 19

blindness in the RIGHT eye

Question 20

a cut at the optic chiasm would cause ___________ (binasal or bitemporal) hemianopsia

Answer 20

bi temporal

Question 21

where do MOST of the retinal ganglion axons synapse?

Answer 21

lateral geniculate nucleus of thalamus

Question 22

from the LGN, some fibers go below the lateral ventricle through the white matter of the ________ lobe, and synapse in the __________ gyrus

Answer 22

temporal, lingual

Question 23

from the LGN, some fibers go above the lateral ventricle through the white matter of the _________ lobe, and synapse in the _________ gyrus

Answer 23

parietal, cuneus

Question 24

Myers loop is associated with fibers traveling through which lobe?

Answer 24

white matter of temporal lobe

Question 25

what is the rule of 3 Ls and pie in the sky?

Answer 25

the LOWER retinal fields travel through Myers LOOP and synapse in the LINGUAL gyrus, leading to a superior quadrantanopsia