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Nervous system

Nervous system. Fun facts about neurons. Most specialized cell in animals Longest cell blue whale neuron 10-30 meters giraffe axon 5 meters human neuron 1-2 meters. Nervous system allows for 1 millisecond response time. Evolution of:.

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Nervous system

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  1. Nervous system

  2. Fun facts about neurons • Most specialized cell in animals • Longest cell • blue whale neuron • 10-30 meters • giraffe axon • 5 meters • human neuron • 1-2 meters Nervous system allows for 1 millisecond response time

  3. Evolution of: • The simplest animals with nervous systems, the cnidarians, have neurons arranged in nerve nets~ • A nerve net is a series of interconnected nerve cells, these are not specialized at all Nerve net

  4. Evolution of: • All these do is contract and relax the gastrovascular cavity… THAT’S IT!!!~ • A nerve net is a series of interconnected nerve cells, these are not specialized at all Nerve net

  5. So, you mean to tell me… they don’t THINK??!!??!!

  6. Ohhhh, but this net brings purposeful movements

  7. Evolution of: • More complex animals actually have multiple nerve cells bound together • Information flows along a specific route Nerve net

  8. Eyespot Brain Brain Nervecords Simplest CNS Ventralnerve cord Transversenerve Segmentalganglia (c) Planarian (flatworm) (d) Leech (annelid)

  9. Evolution of: • Elongated, bilaterally symmetrical organism are CEPHALIZED • Clustering of neurons at at the front end of the body…

  10. ex. Cephalization: ANNELID

  11. ex. Cephalization: ARTHROPOD

  12. ex. Cephalization: VERTEBRATE

  13. Evolution of: • In vertebrates • The CNS is composed of the brain and spinal cord • The peripheral nervous system (PNS) is composed of nerves and ganglia. Nerve net

  14. Organization of Vertebrate Nervous System The spinal cord conveys information from and to the brain

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