Part 10 · The Senses
Same concept, other depth: Clinical Reasoning →
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Retinal layers (light goes in, signal comes out): light → ganglion cells → bipolar cells → rods and cones (at the back) → pigment epithelium. Signal: photoreceptor → bipolar cell → ganglion cell → optic nerve. Only ganglion cells fire action potentials; earlier cells use graded potentials. Horizontal and amacrine cells connect sideways to sharpen contrast.
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