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Divisions of the Nervous System

Divisions of the Nervous System. 2 main divisions of the nervous system. Central Nervous System Brain Spinal Cord Peripheral Nervous System: Autonomic Nervous System Somatic Nervous System. Central Nervous System. The control center of the body .

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Divisions of the Nervous System

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  1. Divisions of the Nervous System

  2. 2 main divisions of the nervous system • Central Nervous System • Brain • Spinal Cord • Peripheral Nervous System: • Autonomic Nervous System • Somatic Nervous System

  3. Central Nervous System • The control center of the body. • Our brain controls most of the functions in our bodies.

  4. CENTRAL NERVOUS SYSTEM • The spinal cord is a thick column of nerve tissue that links the brain to most of the body’s nerves. • Most impulses travel through the spinal cord to get to the brain.

  5. THE BRAIN • Consists of 100 billion neurons, all are interneurons. • Each interneuron receives messages from 10,000 other sensory neurons! • Each interneuron sends a response reaction to 1,000 motor neurons!

  6. THE BRAIN PROTECTION • What helps protect the brain from injury? • 1. Skull • 2. Layers of connective tissue • 3. Fluid between the layers of connective tissue

  7. BRAIN STRUCTURES • Cerebrum • Cerebellum • Brainstem

  8. Largest part of the brain. Divided into 2 halves: 1. Right Side of Cerebrum Controls left side of body Artistic/Creative Side 2. Left Side of Cerebrum Controls right side of body Mathematical side Where learning, intelligence, judgments occur. Interprets input from the senses. Controls voluntary activities. Shapes your attitudes, emotions & personality. CEREBRUM

  9. CEREBELLUM • 2nd largest part of the brain. • Physical coordination. • Coordinates muscle actions. • Maintains balance.

  10. BRAIN STEM (MEDULLA) • Connects the brain to the spinal cord. • Controls involuntary actions. • EX: Regulates breathing and helps control heartbeat.

  11. Central Nervous System __6. Coordinates the actions of the muscles. __7. Controls involuntary body actions, such as breathing. __ 8. Interprets input from the senses. __ 9. Gives the body its sense of balance. __ 10. Carries out learning, remembering, and making judgments. Cerebrum b. Cerebellum Brain Stem (medulla)

  12. Central Nervous System B6. Coordinates the actions of the muscles. __7. Controls involuntary body actions, such as breathing. __ 8. Interprets input from the senses. __ 9. Gives the body its sense of balance. __ 10. Carries out learning, remembering, and making judgments. Cerebrum b. Cerebellum Brain Stem (medulla)

  13. Central Nervous System B6. Coordinates the actions of the muscles. C7. Controls involuntary body actions, such as breathing. __ 8. Interprets input from the senses. __ 9. Gives the body its sense of balance. __ 10. Carries out learning, remembering, and making judgments. Cerebrum b. Cerebellum Brain Stem (medulla)

  14. Central Nervous System B6. Coordinates the actions of the muscles. C7. Controls involuntary body actions, such as breathing. A 8. Interprets input from the senses. __ 9. Gives the body its sense of balance. __ 10. Carries out learning, remembering, and making judgments. Cerebrum b. Cerebellum Brain Stem (medulla)

  15. Central Nervous System B6. Coordinates the actions of the muscles. C7. Controls involuntary body actions, such as breathing. A 8. Interprets input from the senses. B 9. Gives the body its sense of balance. __ 10. Carries out learning, remembering, and making judgments. Cerebrum b. Cerebellum Brain Stem (medulla)

  16. Central Nervous System B6. Coordinates the actions of the muscles. C7. Controls involuntary body actions, such as breathing. A 8. Interprets input from the senses. B 9. Gives the body its sense of balance. A 10. Carries out learning, remembering, and making judgments. Cerebrum b. Cerebellum Brain Stem (medulla)

  17. SPINAL CORD • The spinal cord is a bunch of nerve tissue that are the link between the brain and the peripheral nervous system (PNS).

  18. SPINAL CORD PROTECTION What protects the spinal cord? • Vertebrae column • Layers of connective tissue • A watery fluid

  19. PERIPHERAL NERVOUS SYSTEM (PNS) • Made up of a network of nerves that branch out from the Central Nervous System (CNS).

  20. PERIPHERAL NERVOUS SYSTEM • PNS is divided into to groups. • Somatic Nervous System: • controls voluntary actions • EX: Tying a shoe, eating with a fork • Autonomic Nervous System: • controls involuntary actions • EX: Digestion of food, expansion and relaxation of blood vessels.

  21. AUTONOMIC SOMATIC

  22. Nervous System Injuries • 19. A bruiselike injury of the brain is called a(an) ____________.

  23. Nervous System Injuries • 19. A bruiselike injury of the brain is called a(an) concussion.

  24. 20. What can you do to decrease your chances of getting a brain injury? • Wear a helmet…

  25. 21. What happens when the spinal cord is cut or crushed? • All the nerve axons in the region are damaged-so impulses cannot pass through them causing loss of movement.

  26. Homework…. • Worksheet #102/103

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