Anatomy of the eye

Question 1

function of the medial rectus

Answer 1

adduction - towards nose

Question 2

function of the lateral rectus

Answer 2

abduction - away from nose

Question 3

function of the superior rectus

Answer 3

primarily elevation

Question 4

function of the inferior rectus

Answer 4

primarily depression

Question 5

function of the superior oblique

Answer 5

primarily intorsion
- internal rotation

Question 6

function of the inferior oblique

Answer 6

primarily extorsion
- external rotation

Question 7

what is the magnocellular area of the retina

Answer 7

receptive fields in the periphery
(anywhere but the fovea)
- needs directionality

Question 8

what is the parvocellular area of the retina

Answer 8

receptive fields within the fovea

Question 9

where are there no rods or cones

Answer 9

optic disk - blindspot

Question 10

what are cones

Answer 10

for colour
- most densely packed at the fovea
- provide HD vision

Question 11

how many types of cones are there

Answer 11

3
- each are sensitive to a different wavelength of light
- one each for red, green, and blue

Question 12

what are rods

Answer 12

used to process mvmt across the retina
- primarily in the peripheral portions of the retina

Question 13

what are tetrochromats

Answer 13

have an additional type of cone (yellow)
yellow goes betwene red and green
individuals are better at distinguishing colours

Question 14

who is likely to have tetrachromacy

Answer 14

abotu 15% of women
mothers of boys with colour blindness

Question 15

what is protanopia

Answer 15

colour blindness
- have blue and green
- missing red

Question 16

what is deutranopia

Answer 16

colour blindness
- have red and blue
- missing green