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Ted Petit (39)

Lecture 5

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Ted Petit

Lecture 5: Brain and Behavior Visual system: Everything beings in the retina. The retina is part of the central nervous system. The retina grows out from the brain. Everything is divided in a simple but complicated way. The retine is divided right down the middle, so there two halves. The half that is closes to the nose is called the nasal portion. The outside halves are called the temporal portions of the retina. What goes on in these two portions are very different. Each half of the retina forms a specific connection with the brain. Towards the very bottom, you can see the cortex. We are talking about area 17. At the very top there are the eyeballs at the back of the eyeball is the retina, and there are nerve leaving it. If you look to the left. Nerve: pathway outside the central nervous system. Tract: pathway inside the central nervous system. Even though the eye is part of the central nervous system, we break the rule and call it the optic nerve. The point where the nerves from the two eyes come together and crossover and they continue back and go on up into the brain, this is called an optic chiasm. When it moves back towards the brain it is called the optic tract. The tracts for temporal portion go into the cortex on the same side. So the left nerve of the temporal portion would go on the left side of the brain. However, the nerve of the nasal portion goes into the cortex on the opposite side of the brain. So for the left nerve of the nasal portion would go on the right side of the brain. So
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