PSYC 211 Lecture Notes - Lecture 13: Amacrine Cell, Ganglion Cell, Opsin
14 Jun 2016
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Document Summary
Light passes through transparent cels and stimulate the photoreceptors located at the back of the eye: photoreceptors then send messages to bipolar and ganglion cells located closer to the centre of the eye. The ganglion cells" axon loop around each other and travel back to the brain. The retina contains horizontal and amacrine cells o horizontal and amacrine cells are interneurons without axons. They combine messages from adjacent neurons o amacrine cells connect adjacent cells with bipolar cells o horizontal cells interconnect adjacent photoreceptors with bipolar cells. In vertebrate retina, photoreceptors provide input to both bipolar and horizontal cells o. The first two types of cells (photoreceptors and bipolar cells) do not produce aps o their release of neurotransmitter (glutamate) is regulated by the value of the membrane potential o however light: Thus light shining on the photoreceptor excites the ganglion cell and increases the rate of firing of its axon.
