Vision

Question 1

Rods

Answer 1

Specialized for low light/high sensitivity, more rhodopsin than cones
- not active during the day

Question 2

Cones

Answer 2

Specialized for color

• faster responses, lower amplification
• dominate the fovea
• three wavelength types
• doesn’t generate AP’s (just like rods)

Question 3

Layer 2/3

Answer 3

Sends processed output to higher visual areas

Question 4

Layer 5

Answer 4

Sends feedback to superior colliculus

Question 5

Layer 6

Answer 5

Sends feed back to LGN

Question 6

Layer 4B

Answer 6

Sends fast myelinated fibers to motion processing area MT

- contains stria of Gennari

Question 7

Dorsal stream

Answer 7

“Where”? - Parietal lobe

Question 8

V4

Answer 8

Color vision, dorsal stream “WHAT” - responsible for identifying objects. Has a face area.

Question 9

V5

Answer 9

Spatial vision, ventral stream, “WHERE”?

Question 10

V2-V5

Answer 10

Brodmann’s areas 18 + 19

Question 11

V1

Answer 11

Calcarine fissure, primary visual cortex, Area 17

Question 12

Ventral stream

Answer 12

“What” Pathway - temporal lobe

can judge where things are, can put the envelope in, but cannot tell you what the envelope is.

Question 13

Retinoblastoma

Answer 13

Hereditary photoreceptor neoplasia

• Fatal if gets to optic nerve
• Sx: Leukocoria (white pupil), sensory strabismus
• Tx: chemo and enucleation (if no optic spread)