Stick
In Biology, the stick (or “cell in stick”) is a receiving cell located at the bottom of the eye and composing, with the cones, the cells Photosensible S of the Rétine which transforms the electromagnetic signal of the Lumière into bio-electric signal (nerve impulse) sent towards the brain. The brain can then interpret the signal to build the Vision. The sticks allow the scotopic vision, i.e. with a weak luminosity. This vision is only in black, white and nuance of gray, because the cells photoréceptrices in sticks do not perceive the colors.
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- the sticks collect or detect the luminosity of a Image. Their performances, in particular in low light, enable us to see in the almost complete Obscurité but only in black and white. For this reason one does not see the Couleur S when the light is not strong enough, the performances of the cones (only able to perceive the colors) being much weaker than those of the sticks.
The sticks are also the receivers which are associated with the detection of the movements by the visual cortex.
The sticks draw their name from the roughly cylindrical form of these cell S nervous specific.
Their density is maximum in periphery of the Rétine, minimal close to the Fovéa.
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