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Biology Lesson8.3
 

Biology Lesson8.3

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    Biology Lesson8.3 Biology Lesson8.3 Presentation Transcript

    • The Brain – Lesson 8.3Three Major Parts of the Brain1. Cerebrum2. Cerebellum3. Brain stem
    • Brainstem
    • 1. CerebrumoDivided into two hemispheres oRight – creative, big picture oLeft – logical, mathematicaloRight side of brain controls the left side of the bodyoLeft side of the brain controls the right side of the body
    • Longitudinal fissuredivides two halves ofcerebrum
    • oTwo sides connected by thecorpus callosum a nerve bundle
    • oCerebrum consist of both graymatter and white matteroGray matter on the outsidecalled cerebral cortexo and white matter on the insideoPage 171 in text
    • Note: Brain is convoluted orfolded to get more in a tightspace.So well designed equivalent allphone cable of world into athimble – WOW!
    • Four division or pairs of lobes of the cerebrumFrontal lobes (right and left)Parietal lobes (right and left)Occipital lobes (right and left)Temporal lobe (right and left)
    • Frontal lobe: location of personality, judgment and self controlMotor area of frontal lobe – partof frontal lobe in the rear portioncontrols the voluntary movement of the skeletal muscles.
    • Parietal lobes: analyzes the sensesSpecific areas in lobe for specificareas of the body.
    • Occipital lobe: sense of visionTemporal lobes: sense ofhearing, smell and taste
    • Three Major Parts of the Brain1. Cerebrum2. Cerebellum second largest brain region right and left hemispheres white and gray matter tightly packed, convoluted
    • 2. CerebellumFunction:To take over the skeletal musclecontrol from the cerebrum so itis free to think about biology!Cerebrum slowly gives up aspractice (ex. Basketball layup)
    • Three Major Parts of the Brain1. Cerebrum2. Cerebellum3. Brain stem located between cerebrum and spinal cord
    • 3 parts to brain stem:a. medulla oblongata• lowest section of brain stem•regulates breathing, bloodpressure, and other vital functions•crossover occurs in medullaoblongate
    • 3 parts to brain stem: a. medulla oblongatab. Pons  links cerebrum and cerebellum  assist medulla in regulating breathing  coordinates eye movement
    • 3 parts to brain stem: a. medulla oblongata b. Ponsc. Midbrain located above the pons coordinates eye movements and pupil dilation contains reticular formation
    • Reticular Formation:On/off switch of cerebrumSwitches cerebral cortex on youwake and are conscious/off you goto sleep, adjust level of alertnessDamage = coma
    • Reticular formation nuclei are locatedthroughout the brain stem.
    • Limbic System a number of complex brain structuresaround the brain stem.
    • Limbic system includes:thalamus – switch board –sends pulses to right place inbrainhypothalamus – control unitfor autonomic and endocrinesystems (adrenaline)