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The Nervous System!
Controls all other systems!!!
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Main Function of the Nervous System• To receive stimuli from inside and outside of
the body, to interpret the stimuli, and initiate responses for survival.
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Division of the Nervous System
• Central Nervous System (CNS)– Brain– Spinal Cord
• Peripheral Nervous System (PNS)– Peripheral nerves– Somatic and Autonomic Systems
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Central Nervous System (CNS)
• Organ functions– Brain: coordinates all of the body’s activities– Spinal cord: connects the brain to the peripheral
nerves Jellyfish have no
brain!
Human
Sheep
Cat
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The Brain• Cerebrum: Controls thoughts, voluntary actions, and
sensations related to five senses.
• Cerebellum: Coordinates *voluntary muscle* movements and balance.
• Brain stem: Located at the base of the brain and controls vital and *involuntary* processes (ex’s: breathing, heart beat, and digestion)
• Fun fact: It weighs about 3 lbs
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Human
Sheep
Cat
Cerebrum
Cerebellum
Brain stem
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Spinal Cord• A bundle of nerves that begins at the brain
stem and connects to the peripheral nerves • Vertebrae protect the spinal cord
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Central Nervous System (CNS)Organs and Functions
Brain Spinal Cord
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Peripheral Nervous SystemConnects the brain and spinal cord to other bodyparts.
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Communication is Key
• How does the nervous system communicate?• Neurons and neurotransmitters
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Terminal Button
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Reflexes• An involuntary, automatic response to a
stimulus.• Reflex arc
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Examples of Reflexes
• *Knee jerk (helps stand upright)• *Blinking (protects eyes; cleans them)• *Arm raise (protects face)• Coughing (clears airways when irritated)• Sneezing (clears airways when irritated)• Goosebumps (warm up body) • Shivering (warm up body)
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Music Video Time!
• http://www.youtube.com/watch?v=40EBLb1avhM&feature=player_detailpage