Required at some level more or less continuously

TLS Online TPP Program

#Id: 5633

#Unit 7. System Physiology – Animal

The retina organized into layers: Outer nuclear layer contains the photoreceptors , rods & cones 

Inner nuclear layer contains the cell bodies of excitatory and

inhibitory interneurons including bipolar cells, horizontal cells, & amacrine cells

TLS Online TPP Program

#Id: 5634

#Unit 7. System Physiology – Animal

Rods 

Have low acuity or resolution

are sensitive to low-intensity light

receptors for night vision (scotopic vision)

TLS Online TPP Program

#Id: 5635

#Unit 7. System Physiology – Animal

Cones 

Higher visual acuity

responsible for vision in bright light (photopic vision) Participate in color vision

TLS Online TPP Program

#Id: 5636

#Unit 7. System Physiology – Animal

Inputs from eye to CNS: 

Input from the rods 

Input from the cones

TLS Online TPP Program

#Id: 5637

#Unit 7. System Physiology – Animal

Duplicity Theory 

The existence of these two kinds of input, each working maximally under different conditions of illumination

TLS Online TPP Program

#Id: 5638

#Unit 7. System Physiology – Animal

Axons of retinal ganglion cells  Received and transduced information and carried to the CNS