Functions of the Nervous SystemFunctions of the Nervous System

Master control and communication system Master control and communication system of the body of the body

Uses electrical signals to communicateUses electrical signals to communicate2 subdivisions:2 subdivisions:

Central Nervous System (CNS)- brain & Central Nervous System (CNS)- brain & spinal cordspinal cord

Peripheral Nervous System (PNS)- nervesPeripheral Nervous System (PNS)- nerves

Functions of the Nervous SystemFunctions of the Nervous System

Sensory receptorSensory receptor senses stimuli ---- senses stimuli ---- sends message to sends message to integration centerintegration center ---- ---- motor outputmotor output signals a response signals a response

Knee Jerk ReflexKnee Jerk Reflex

ReflexReflex- rapid, automatic response - rapid, automatic response

Neuron StructureNeuron Structure

DendritesDendrites- receive - receive signalssignals

Cell BodyCell Body-- Brain of Brain of neuronneuron

AxonsAxons- Carries signals - Carries signals away from cell bodyaway from cell body

MyelinMyelin- Insulation on - Insulation on axonaxon

Nodes of RanvierNodes of Ranvier- - Signal “jumps” along Signal “jumps” along thesethese

Multiple SclerosisMultiple Sclerosis

Types of NeuronsTypes of Neurons

Sensory NeuronSensory Neuron- send info- send info InterneuronInterneuron- produce a response- produce a responseMotor NeuronMotor Neuron- brings response to body - brings response to body

cellscells

Divisions of the PNSDivisions of the PNS

phSuccessnet.comphSuccessnet.com

Online activities 28.1, 28.2, 28.3Online activities 28.1, 28.2, 28.3Turn in to bin when done.Turn in to bin when done.

Animation of Brain Development

Brain DevelopmentBrain Development

Neural tube– around the 4Neural tube– around the 4thth week of week of developmentdevelopmentAnterior part develops into brainAnterior part develops into brainRest becomes spinal cordRest becomes spinal cordVentricles form in the center (holes that hold Ventricles form in the center (holes that hold

CSF)CSF)Grows to ~3 lbsGrows to ~3 lbs

Brain TestsBrain Tests

Count every " F" in the following text: Count every " F" in the following text:

FINISHED FILES ARE THE RE FINISHED FILES ARE THE RE SULT OF YEARS OF SCIENTI SULT OF YEARS OF SCIENTI FIC STUDY COMBINED WITH FIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS... THE EXPERIENCE OF YEARS...

O lny srmat poelpe can raed tihs.O lny srmat poelpe can raed tihs.

cdnuolt blveiee taht I cluod aulaclty  uesdnatnrd cdnuolt blveiee taht I cluod aulaclty  uesdnatnrd waht I was rdanieg. The waht I was rdanieg. The phaonmneal pweor of the hmuan mnid, aoccdrnig  to phaonmneal pweor of the hmuan mnid, aoccdrnig  to a rscheearch at Cmabrigde Uinervtisy, a rscheearch at Cmabrigde Uinervtisy,

it deosn't mttaer in waht oredr the  ltteers in a wrod it deosn't mttaer in waht oredr the  ltteers in a wrod are, the olny iprmoatnt tihng is taht the frist and lsat are, the olny iprmoatnt tihng is taht the frist and lsat  ltteer be in the rghit pclae. The rset can be a taotl  ltteer be in the rghit pclae. The rset can be a taotl mses and you can sitll  raed it wouthit a porbelm. mses and you can sitll  raed it wouthit a porbelm.

Tihs is bcuseae the huamn mnid deos not raed ervey Tihs is bcuseae the huamn mnid deos not raed ervey  lteter by istlef, but the wrod as a wlohe. Amzanig  lteter by istlef, but the wrod as a wlohe. Amzanig huh? And I awlyas  tghuhot slpeling was ipmorant!huh? And I awlyas  tghuhot slpeling was ipmorant!

Regions of the BrainRegions of the Brain

CerebrumCerebrumDiencephalonDiencephalonBrain StemBrain StemCerebellumCerebellum

I. CerebrumI. Cerebrum

Left sideLeft side: problem solving, logistical : problem solving, logistical thinking (controls right side)thinking (controls right side)

Right sideRight side: creative thoughts & imagination : creative thoughts & imagination (controls left side)(controls left side)

Corpus Callosum-Corpus Callosum- Connects 2 sides Connects 2 sides

4 Lobes of Cerebrum4 Lobes of Cerebrum

ParietalParietal- touch, taste- touch, taste FrontalFrontal- decision - decision

making, problem making, problem solving, planning, solving, planning, movement, speech movement, speech

Temporal- Temporal- memory, memory, hearing, emotions, hearing, emotions, smellsmell

Occipital- Occipital- sightsight

MemoryMemory

HippocampusHippocampusAmygdalaAmygdala

II. DiencephalonII. Diencephalon

““inner brain”inner brain”Thalamus- Enhances or blocks signalsThalamus- Enhances or blocks signalsHypothalamus- temp regulation, blood Hypothalamus- temp regulation, blood

pressure, hunger, thirst, sex drivepressure, hunger, thirst, sex drive

III. Brain StemIII. Brain Stem

3” long, diameter of thumb3” long, diameter of thumbSleep, breathing, body movementSleep, breathing, body movement

IV. CerebellumIV. Cerebellum

Balance, equilibrium, skeletal muscle Balance, equilibrium, skeletal muscle activityactivity

Damage= ATAXIA (clumsy & Damage= ATAXIA (clumsy & disorganized)disorganized)