The Eye: An Overview
As light penetrates the eye, the cornea refracts the light through the pupil and then the lens, which focuses the light onto the retina. There, photosensitive cells initiate electrical signals that travel along the optic nerve carrying the visual information to various brain areas in the opposite hemisphere, including the lateral geniculate nucleus (LGN), which relays the sensory information to the visual cortex at the back of the brain.
To reach the photoreceptors—the rods and cones—at the back of the retina, light must first travel through a thicket of other retinal cells. Glial cells called Müller cells guide incoming light to the photoreceptors, where photons are translated into nerve impulses via a biochemical reaction mediated by photopigments in the membrane of the cells’ outer segments. Bipolar neurons relay the signal from the photoreceptors to the ganglion cells, whose axons form the optic nerve, with the help of amacrine and horizontal neuronal cells.
A Taste Of Wine Science
The Key Chemicals in Red Wine. Colour, Flavour, and Potential Health Benefits
A Guide To The Twenty Common Amino Acids
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Pygmy Gecko - The Unsinkable Creature
Wasp Given Harry Potter Name
To generate involvement and emotional ties between people and biodiversity, a museum in Berlin asked visitors to vote on the scientific name of a newly discovered wasp. Of the four options, visitors selected Ampulex dementor, which refers to the fictional beings in the Harry Potter series known as dementors that can consume a person’s soul and leave them in a vegetative state. The name alludes to how the wasp can leave a roach limp after paralyzing it with a sting. According to a paper published this week in PLOS ONE, museum visitors expressed a high interest in naming the wasp, suggesting that opportunities for public participation in discovery can ignite appreciation for science.