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THE NERVOUS SYSTEM

THE NERVOUS SYSTEM. HOW DOES IT WORK?. Function of the Nervous System. Controls and coordinates functions throughout the body How? By responding to external and internal stimuli ! List 3 external ( outside the body) stimuli: Temperature Texture Brightness

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THE NERVOUS SYSTEM

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  1. THE NERVOUS SYSTEM HOW DOES IT WORK?

  2. Function of the Nervous System • Controlsandcoordinatesfunctions throughout the body • How? • By responding to external and internalstimuli! • List 3external(outside the body) stimuli: • Temperature • Texture • Brightness • List 2internal(inside the body) stimuli: • Heart rate • Peristalsis

  3. Neurons http://www.rainbowstudio.com • Special cell that transmitsimpulses • 3TYPES • Sensory • From sense organs (eyes, nose, skin, ears, tongue)tobrain/spinal cord • Motor • Frombrain/spinal cordtomuscles/glands • Interneurons • Interconnectother two types • Found in brain and spinal cord

  4. Parts of a Neuron

  5. The Synapse • Impulses aretransmittedfrom one neuron to the next • Synapse: • Thespacebetweenneuronswhere impulses “jump” from one neuron to the next • Neurotransmitters: • Chemicalsused to helptransfertheimpulseacross thesynapse • Found intiny sacs (vesicles)at theaxon terminals • Released fromvesiclesby theimpulsereaching theaxon terminals

  6. The Synapse

  7. The Nervous System How is it made up?

  8. Divisions of the Nervous System • The nervous system is divided into 2 main parts: • The Central Nervous System (CNS) • The Peripheral Nervous System (PNS) http://www.morphonix.com/software/education/science/brain/game/specimens/nervous_system.html

  9. The Central Nervous System (CNS) • Consists of: • The brain • The spinal cord

  10. The Brain • Cerebrum • Largestpart of brain • All voluntary(you can control!) movements controlled here • Leftside of brain deals with right side of body andvice versa • Cerebellum • Secondlargest region • Coordinationandbalance • “Bellum balance”

  11. The Brain con’t….. • Brain stem • Connects brain to spinal cord • Consists of • Medulla oblongata (heart rate, etc) • Thalamus • Receives messages from sense organs • Hypothalamus • Control center for hunger, fatigue, body temp

  12. PARTS OF THE BRAIN

  13. Parts of the Brain Fill-In

  14. BRAIN CONTROL What parts of the brain control what???????

  15. The Spinal Cord • Communication link btw brain and rest of body • REFLEXES are processed here • Can you name some commonreflexes????????????

  16. Peripheral Nervous System (PNS) • TWO FUNCTIONS • TRANSFER IMPULSES FROMSENSE ORGANSCNS • TRANSFER IMPULSES FROMCNSMUSCLES OR GLANDS • Can you remember which neurons are involved?? • Sensory • Motor

  17. Peripheral Nervous System (PNS) • TWO PARTS • SOMATIC NS • VOLUNTARY MOVEMENTS • AUTONOMIC NS • INVOLUNTARY ACTIONS • HEARTBEAT • GLAND STIMULATION

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