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Ted Petit (310)

PSYB65 Lec02.docx

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Ted Petit

Lec02 Basic organization of the brain  How is it basically structured o Spinal cord  forebrain Outline  Structure of the human brain o Lobes of the cerebral cortex  Vast majority of human brain  Stroke in brain stem  dead  Stroke in cerebral cortex  diagnosable  Function and organization of cerebral hemispheres  Ventricles  Meninges  Blood supply of the brain o Strokes o Tumors Cerebral cortex Gyrencelphalic vs Lissenphalic  Gyrencelphalic o With gyri and sulci  Human brain o Gyri  mountains o Sulci  fissures  Lissenphalic o Smooth  Rat brain Cerebral hemispheres  Human brains separated into left and right hemispheres o Mirror images o Not exactly alike  slight differences  Right brain (hemisphere) o Controls and receives information from left side of the body  Contralateral  Left brain (hemisphere o Controls and receives information from right side of the body  Contralateral  Corresponding on the opposite side of the body  Corpus callosum connects the two hemispheres o  Three main sulci o Longitudinal fissure divides the two hemispheres  AKA longitudinal sulcus o Central sulcus  AKA central fissure  Divides brain from front to back  Separates frontal and parietal lobes o Sylvian fissure  AKA lateral fissure  Separates frontal lobe and temporal lobes Corpus Callosum Cerebral lobes  Four lobes on each hemisphere (technically)  Fore lobes in general o Frontal lobe o Parietal lobe o Temporal lobe o Occipital lobe  Each lobe has one major primary function  Each lobe has two different types of cortex o Primary  Responsible for performing basic input / output function  Area that is responsible the primary function of the specific lobe o Associational  Higher order function  Compared to primary basic functions  More recently evolved  Humans  more association cortex Brodmann’s map of the brain  Numbered areas of the brain  Pinpoint specific areas to specific functions Frontal lobe  Begins in anterior portion of brain  Ends at the central sulcus  Primary function o Motor control o Planning o Inhibition of inappropriate behaviors  Delayed gratification  Long term planning o Visceral sensations  Primary area of motor control o Brodmann areas 4 and 6  Immediately anterior to central sulcus  AKA precentral gyrus  Everything in front of primary area  association cortex  Motor homunculus in the frontal primary motor cortex o Legs at the top of the brain // face towards the side of the brain Lobes of the cortex Cerebral organization 2 Motor homunculus (Frontal) Parietal lobe  Begins at the central sulcus  Ends at the occipital cortex  Primary function o Receive information from the non-specialized senses o Receive information from somatosensory senses  Soma  body o Main function in touch stimulation o Examples of specialized senses  Smell  Vision  Hearing  Primary area o Brodmann’s areas 3 1 2  Postcentral gyrus  Everything else is ass
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