Chapter 2.2

Question 1

What two sets of blood vessels supply the eye with nutrients

Answer 1

-the choroidal vessels and retinal vessels supply the eye with nutrients

Question 2

What is the front of the eye divided into? Where are these two layers

Answer 2

• divided into the anterior chamber and the posterior chamber
• anterior chamber= in front of iris
• posterior chamber=between iris and less

Question 3

What two muscles is the iris composed of? Note the iris is the colored part of the eye.

Answer 3

• dilator pupillae(dilates under sympathetic stimulation)

- constrictor pupillae(constricts under parasympathetic input)

Question 4

What produces the aqueous humor? Where does the aqueous humor drain into?

Answer 4

• the ciliary body produces the aqueous humor

- it drains into the canal of Schlemm

Question 5

Where does the lens lie? What does it help control?

Answer 5

• the lens lies behind the iris

- .it helps control refraction of incoming light

Question 6

What nervous system is the ciliary body under control of

Answer 6

-it is under the control of the parasympathetic nervous system

Question 7

What is the role of the vitreous humor

Answer 7

• it is a transparent gel

- >that supports the retina

Question 8

What does the duplicity theory of vision state

Answer 8

• it states that the retina has two kinds of photoreceptors

- >rods and cones

Question 9

What do rods contain that allow for sensation of light and dark

Answer 9

• they contain the single pigment rhodopsin

- >made up of opsin and retinal

Question 10

What are amacrine and horizontal cells used for

Answer 10

• they are used for edge detection

- >basically increase our perception of contrasts

Question 11

Describe the crossing over of fibers in the eye in the optic chiasm? What are these fibers referred to as once they leave the optic chiasm?

Answer 11

• the nasal fibers contain the temporal field of view
• > they cross over at the optic chiasm
• the temporal fibers contain the nasal field of view
• > they do not cross over at the optic chiasm

-they are referred to as optic tracts once they leave the optic chiasm

Question 12

What does the superior colliculus control

Answer 12

• the reflexive eye movements

- >in response due to visual stimuli

Question 13

What is meant by parallel processing

Answer 13

• it is the ability
• > to simultaneously analyze and combine info regarding:
• > color, shape and motion

Question 14

What is feature detection

Answer 14

• visual pathways
• > contain cells specialized in detection of:
• > vision, motion and shape

Question 15

What cells detect shape? Describe the spatial and temporal resolution of these cells

Answer 15

• parvocellular cells
• > they detect shape
• high color spatial resolution
• low temporal resolution
• > therefore, can only detect stationary objects

Question 16

What cells detect motion? Describe the spatial and temporal resolution of these cells

Answer 16

• magnocellular cells
• > they detect motion
• low spatial resolution
• high temporal resolution
• > therefore, blurry but moving image of an object