The Brain – Lesson 8.3Three Major Parts of the Brain1. Cerebrum2. Cerebellum3. Brain stem
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 inbrainhypothalamus – control unitfor autonomic and endocrinesystems (adrenaline)