1. N ERVOUS S YSTEM 2/9/16

2. N EURONS Shape and size? How long do they live? Why is this a good thing? Easily replaced? Amitotic: what does this mean?

3. H UNTINGTON ’ S D ISEASE Inherited Causes the progressive breakdown (degeneration) of nerve cells in the brain. Results in movement, cognitive (thinking), and psychiatric disorders

4. H UNTINGTON ’ S D ISEASE

5. https://www.youtube.com/watch?v=rleVD Q-4MsY

6. N EURONS Have huge appetites About ________ of calories that you take in are consumed by your brain’s activities

7. N EURONS Soma Nucleus Ribosomes Cytoplasm Mitochondria

9. N EURONS Dendrites Listeners Gossip Center Pick up messages, news, information from other cells

10. N EURONS Dendrites

11. N EURONS If the dendtrites are the listeners, then the axon is the _____________ A long extension (fiber) Can be really short, or can run from your spine down to your ankle

12. N EURONS

13. A XONS Transmit electrical signals _________ from the cell body __________ other cells

14. C LASSIFICATION OF N EURONS Differ in structure because they differ in _________ How do we tell? How many process extend out from the cell body?

15. M ULTIPOLAR N EURONS 99% of all neurons in your body are multipolar (3 or more processes) Have one axon and a bunch of dendrites

16. M ULTIPOLAR N EURONS

17. B IPOLAR N EURONS 2 Processes One Axon, and a single dendrite

18. B IPOLAR NEURONS Rare Found in only a few sensory places Smell, sight, and taste

19. B IPOLAR N EURONS

20. U NIPOLAR Just one process Sensory Pain, touch, taste, proprioception (body balance)

21. U NIPOLAR

22. F UNCTION OF N EURONS Which way does the impulse travel through a neuron in relation to the brain and spine? 1. Sensory (Afferent) 2. Motor (Efferent) 3. Interneurons (Associate Neurons)

23. S ENSORY (A FFERENT ) Pick up messages and transmit impulses from sensory receptors toward the CNS Most sensory neurons are unipolar

24. M OTOR (E FFERENT ) N EURONS Travel/transmit information away from the CNS and towards the body’s muscles and glands Mostly multipolar

25. M OTOR U NIT R ECRUITMENT

26. I NTERNEURONS Impulses move between sensory and motor Most abundant of your body’s neurons Mostly multipolar