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Lecture 1

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Ted Petit

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Lecture 1: Introduction to Brain and Behaviors Course Information: Pay attention to the normal brain function and the diseased brain function segments. Course site: Overall Look of the Nervous System The nervous system is divided into two major parts o Central Nervous System: made with of the brain and the spinal cord. o Peripheral Nervous System: made up of all the other nerves (the nerves throughout your body) Organization of the nervous system o There is no dividing line between the brain and the spinal cord. The spinal cord goes into the frame magma and into the brain. The only way to tell is the gradual change in the cell types. o When the brain is being seen, you usually see the cerebral cortex and the cerebellum o The human brain is somewhat identical to the brain of a rat, dog or higher animals in terms of overall organization o At the back of the brain there is the spinal cord. As you more forward you can break the brain into forebrain, midbrain and hindbrain. Hindbrain: is known as the brain stem. Major components of the hindbrain are the cerebellum and the medulla. The cerebellum is generally involved in sensory-motor integration (this means that it puts together sensory input and motor output). It allows you to stand up with two legs, gives you balance, gives you the ability to maneuver, keeps you from falling backwards or forwards. When the cerebellum is damaged you would look like someone who is drunk. The medulla is responsible for basic life processes, such as heart rate, respiration so it keeps you alive. Responsible for the most basic functions of the body. Not the place to have a stroke or a tumor. Midbrain: Major structure is the reticular formation (composed of number of different nuclei). The reticular formation is responsible in the sleep wakefulness cycles. It wakes us up and puts us back to sleep. If there is damage, and you dont wake up it is called a coma. Forebrain: The most interior portion of the brain. The human brain by mass is mostly forebrain. The thalamus (the big central portion). Underneath the thalamus is the hypothalamus. The thalamus is a
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