Function of the retina Annika Malmgren, 2009.

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Presentation transcript:

Function of the retina Annika Malmgren, 2009

FUNCTION OF THE RETINA To convert electromagnetic waves into action potentials AND To differentiate between different electromagnetic stimuli

structure of the retina

The fovea

Photoreceptors

Photoreception LIGHT HYPERPOLARIZATION BATHORHODOPSIN RHODOPSIN METARHODOPSIN II Opsin All-trans Water Transducin Retinaldehyde 11-cis Alpha-subunit 5’-GMP cGMP Phosphodiesterase Na+ LIGHT HYPERPOLARIZATION K+ Na+

opsins OPSIN SCOTOPSIN PHOTOPSIN 445 nm 535 nm 570 nm Blue Green Red

Signal transmission Glutamate Glutamate (inhibiting) OFF cells ON cells Inhibition Excitation W-cells X-cells Y-cells From rods From cones: From cones: Color, shape Movement

FUNCTION OF THE RETINA To convert electromagnetic waves into action potentials AND To differentiate between different electromagnetic stimuli (both colors and static/movement)

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