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Lectures - Midterm.docx

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Ted Petit

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Type the document titleLecture 1 httpwwwutscutorontocapsyb65Global Organization of the Human BrainCentral Nervous System CNSSpinal CordBrainPeripheral Nervous System PNSall other nervous that serves the rest of the body When drawn schematically the human brains overall organization is very similar to any higher order mammal Brain stemvery lose term something that holds the brain by Medulla and cerebellumtwo major areas of the brain HindbrainCerebellumSensory motor integrationsends in sensory input and sends out motor output Balanceability to stand erect Sticks out at the back of the brainMedulla Basic life processeskeeps a person alive at the most basic level eg Heart rate breathing etcMidbrainReticular FormationSleepwakefulness cyclesDamage results in a coma most likely Forebrainthe most anterior part of the brainBiggest in the human brain relative to other parts of the brainThalamus Huge central portion of the forebrain Major relay center particular in humans and higher mammalsconveys information to the appropriate place in the neocortex Hypothalamus Controls life functions but not primitive functions that keeps the individual aliveeg Thirst hungry territoriality sexual behavior Anything that feels good Limbic SystemDeals with emotions and emotionality Allows animals to feel an emotionAmygdalaType the document title Cerebral Cortex Most anterior structure very front of the brain not connected to anything but curves back and covers everything Also known as the neocortexInvolved in higher intellectual functionsspeech reasoning intelligence etc Comprises of most of the human brain 85Evolution of the Human BrainAs we developed greater intellectual ability nuclei were developed got bigger so that more information could be processed Developed these bumps excess neurons nuclei that contained cells that were linked to specific pathways We have developed as humans a bigger cerebral cortex that gives us intellectual abilities and problem solving We dont have the biggest cerebral cortex elephants doIf compared by cortex to body size dolphins are dominant humans are secondSize of the structure are directly related to the importance and use of that particular function in that particular speciesOlfactory bulbprocesses smell relatively big in rats whom are dependent on smell Human Brain Development You as a species as your are born til you mature go through the same evolutionary process as the developing of the species Humans have gills and tails that are resorbed during our developing At 3 weeks Certain nuclei begins to develop7 weeksforebrain is beginning to get larger9 weeksforebrain continues to get bigger and folds upon itself cerebral cortex although starts off at the anterior portion of the brain begins to develop and as there is not enough room in the human skull as it develops it pushes against the skill and bends around the skull virtually covers everything except the cerebellum As the brain develops more and more brain cells are developed and as skull remains to be cramped the brain folds Macleans Triune Theory There are three basic components to the human brainThe human brain is really three brains in one three basic componentsReptilian Brainbrain stembasic things that keep species alive have began existing in reptiles and that we haventthrown that away yet humans still have it
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