What is the visual way?
The visual path is a network of nerves that mediate light that hit the eyes in the brain in the form of chemical and electric information. The optical nerve carries signals indicating the color, brightness and movement from the retina to the relay center in the middle of the brain called thalamus. From there, neurons will reach the visual cortex of the occipital brain lobe, which assembles a nervous map or graph of the visual fields of both eyes. The primary task of the visual pathway to convert information about light into a picture of the outside world is moderated by the neurons of the visual bark.
In the eye, the visual path begins when light passes through the cornea, pupil and lens, where it is turned and projected on the retina. Specialized cells, called photoreceptors, contain the retina. There are two types of photoreceptor cells in the mammal retina: rod cells that detect the relative light intensity and work best in the dark; And cones that are sensitive to color. When light hits one of these cell varieties, it undergoes a chemical reaction that results in signals of bipolar cells directAbout behind them.
From the retina, visual information passes to bipolar cells and then to the ganglium cells of the optical nerve. The optical nerve that starts on the retina is the only visual way to the brain. Light information is mediated as electrical action potential through neurons. These nerves represent the wavelength of light as its color and its intensity as its brightness, using a special type of code to hand over this information to the brain.
Two tracts of the optical nerve - one of each eye - walk each other before entering the brain. The right and left visual tracts coming from the eyes pass to the left and right hemispheres of the brain. The small bundle of neurons monitors a separate visual way to pre -condense information about light and darkness into the nerve areas that regulate the circadian rhythm of the body, including sleep patterns and awakening. Most nerves in the visual path progress to thalamus in the center of the brain where they are inLittle visual information sorted and then passed to the cortex.
The visual bark is a very large area of the brain and occupies a large part of the occipital lobe. Here many neurons are highly specialized in signaling only when the object is seen with a specific color, angle or placement in the eye field. The whole field of both eyes is represented in the bark as a large map composed of these specialized cells arranged together, where the information mediated by the visual way is solved and organized. Recognition of objects and many complex aspects of conscious visual perception are widely distributed across the brain.