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PSYB65- Lecture 2.docx

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Ted Petit

PSYB65- Lecture  Corpus collosum is the pathway that connects the two hemispheres of the brain and allowing them to communicate with each other  Central sulcus is a very prominent groove  Sylvian or lateral fissure is the large fissure on the side  Each lobe has some major function; also each lobe has two different kinds of cortex/tissue; primary cortex and associational cortex; primary cortex is the area of the cortex that deals with the primary thing that lobe does; primary cortex is where the information comes to directly and is relatively small; primary is surrounded by tissue that processes it, which is referred to as the associational cortex; performs the higher order functions; associational cortex is newer in terms of evolution, and the more highly evolved and intelligent animals have more associational cortex;  Brodmann mapped the cerebral cortex of the human, and put numbers on the areas;  Frontal lobe begins at the very anterior portion of the brain and continues backward until it hits and ends at the central sulcus; mostly involved in motor movement functions; output; also involves planning, knowing what’s appropriate, and how to get where you want to go in humans; precentral gyrus is the primary motor strip and everything else is associational (areas 4 and 6); information is sent out through the primary motor strip after the consulting is done by the associational cortex; primary motor strip has a homunculus (little man)  Parietal lobe starts just posterior to the central sulcus and moves backward; responsible for sensations from the body (somatosensory input), not the specialized senses such as the eyes or the ears; primary cortex of the parietal lobe is the postcentral gyrus and all other area is associational (areas 3,1,2); both the motor primary cortex and the sensory primary cortex have a homunculus;  Homunculus- neurons for toes and feet are at the top of the brain, then hands, moving down to the body, then face on the sides of the brain  Paralysis refers to the inability to move not sense  Occipital lobe is at the posterior portion of the brain, just above the cerebellum; major function is vision and it receives information fro
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