Chapter 2.2 Flashcards
What two sets of blood vessels supply the eye with nutrients
-the choroidal vessels and retinal vessels supply the eye with nutrients
What is the front of the eye divided into? Where are these two layers
- divided into the anterior chamber and the posterior chamber
- anterior chamber= in front of iris
- posterior chamber=between iris and less
What two muscles is the iris composed of? Note the iris is the colored part of the eye.
- dilator pupillae(dilates under sympathetic stimulation)
- constrictor pupillae(constricts under parasympathetic input)
What produces the aqueous humor? Where does the aqueous humor drain into?
- the ciliary body produces the aqueous humor
- it drains into the canal of Schlemm
Where does the lens lie? What does it help control?
- the lens lies behind the iris
- .it helps control refraction of incoming light
What nervous system is the ciliary body under control of
-it is under the control of the parasympathetic nervous system
What is the role of the vitreous humor
- it is a transparent gel
- >that supports the retina
What does the duplicity theory of vision state
- it states that the retina has two kinds of photoreceptors
- >rods and cones
What do rods contain that allow for sensation of light and dark
- they contain the single pigment rhodopsin
- >made up of opsin and retinal
What are amacrine and horizontal cells used for
- they are used for edge detection
- >basically increase our perception of contrasts
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?
- 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
What does the superior colliculus control
- the reflexive eye movements
- >in response due to visual stimuli
What is meant by parallel processing
- it is the ability
- > to simultaneously analyze and combine info regarding:
- > color, shape and motion
What is feature detection
- visual pathways
- > contain cells specialized in detection of:
- > vision, motion and shape
What cells detect shape? Describe the spatial and temporal resolution of these cells
- parvocellular cells
- > they detect shape
- high color spatial resolution
- low temporal resolution
- > therefore, can only detect stationary objects
