(5) RETINA Flashcards
RODS & CONES
NUMBER
RODS 120 MILLION
CONES 6 MILLION
RODS & CONES
LOCATION
RODS peripheral retina
CONES central retina
RODS & CONES
SENSITIVITY (greater/lesser)
RODS greater
CONES lesser
RODS & CONES
THRESHOLD (greater/lesser)
RODS lesser
CONES greater
RODS & CONES
RETINAL PIGMENT
RODS Rhodopsin
CONES Iodopsin
RODS & CONES
FORM SENSE (Acute/poor)
RODS poor form sense
CONES acute form sense
it can present form of an object
- rods
- cones
- cones
it can present contour of an object
- rods
- cones
- rods
RODS & CONES
DESCRIPTION
- primitive and crude
RODS
RODS & CONES
DESCRIPTION
- one vision refined
CONES
VISIBLE SPECTRUM
can appreciate white light (from longer wavelength upto shorter wavelength)
- rods
- cones
cones
VISIBLE SPECTRUM
- appreciate short white light
- rods
- cones
rods
WAVELENGTH
- sensitive to all
- RODS
- CONES
CONES
WAVELENGTH
- sees no red
- RODS
- CONES
RODS
COLOR SENSE
- achromatic
- RODS
- CONES
RODS
COLOR SENSE
- achromatic
- RODS
- CONES
CONES
SUMMATION
- no
- RODS
- CONES
CONES
SUMMATION
- with
- RODS
- CONES
RODS
PARTS OF THE CELL
cell body contain nucleus
cell processes
the pigment migrates into processes and may almost reach the external limiting membrane
- photopic vision
- scotopic vision
scotopic vision
RODS: its withdrawal to the dark position required from
- 1-2 hrs
- 2-3 hrs
- 1-2 hrs
3 parts of cone cells
- cone body
- thicker process
- slender process
3 parts of thicker process
- cone-rod, a short outer membrane
- inner membrane
- cone myoid
staining property of the retina varies with exposure to light
chemical
the exposure to light causes the retina to become _____ in reaction
acid
the layer of the rods and cones become ______ charge when expose to light
- positive
- negative
positive
it is the signal that travels along the nerve fiber
nerve impulse
