1. DO NOW Get into a group of 3 with the people who have the same Case # as you on their Do Now paper. Read the article and summarize it as a group. Choose someone to speak for your group!

2. OBJECTIVES Identify and explain the different types of sensory receptors. Explain referred and phantom pain. Compare and contrast acute and chronic pain.

3. 10.1-10.4 SPECIAL SENSES

4. PHANTOM PAIN The sensation of pain in a limb that has been amputated. Causes aren’t completely understood damaged nerve endings, scar tissue at the site of the amputation and the physical memory of pre-amputation pain in the affected area http://www.youtube.com/watch?v=YL _6OMPywnQ

5. DO NOW What is phantom pain? What causes it? What is mirror therapy? How else could someone alleviate this pain?

6. OBJECTIVES Identify and explain the different types of sensory receptors. Explain referred and phantom pain. Compare and contrast acute and chronic pain.

7. PHANTOM PAIN http://www.youtube.com/watch?v=hlQZmNlPdHQ

8. RECEPTORS & SENSATIONS Sensation formed based on the sensory input from receptors how brain interprets it Projection Brain sends the sensation back to its point of origin person can pinpoint the area of stimulation

9. RECEPTIVE FIELDS Remember the 2 point discrimination in the lab? Which part of your body had a larger receptive field?

10. SENSORY ADAPTATION Before reading this sentence, could you feel your clothes on your skin? The ability to ignore unimportant stimuli is called sensory adaptation.

11. RECEPTOR CATEGORIES Somatic senses touch, pressure, pain Specialized senses smell, taste, hearing, equilibrium, vision

12. SOMATIC RECEPTORS Chemoreceptors Thermoreceptors Photoreceptors Mechanoreceptors Pain receptors (Nociceptors)

13. CHEMORECEPTORS respond to changes in chemical concentrations Ex: Monitor CO 2 levels in blood and pH

14. THERMORECEPTORS Respond to changes in temperature

15. THERMORECEPTOR ACTIVITY Place your pointer finger on your right hand in cold water and the same finger on your left hand in warm water. Leave them in there for 1 minute Now place them both in the room temperature water.

16. PHOTORECEPTORS Responds to light Rods- respond to light Cones- respond to colors

17. PHOTORECEPTOR ACTIVITY Hold the ends of a pencil, one in each hand. Hold them horizontally facing each other at arms-length from your body. 2. With one eye closed, try to touch the end of the pencils together. 3. Now try with two eyes. What did you experience?

18. MECHANORECEPTORS Free nerve endings common in epithelial tissues simplest receptors sense itching Meissner’s corpuscles abundant in hairless portions of skin; lips detect fine touch; distinguish between two points on the skin Pacinian corpuscles common in deeper subcutaneous tissues, tendons, and ligaments detect heavy pressure and vibrations

19. PAIN RECEPTORS “Nociceptors”- found on free nerve endings Respond to tissue damage Pain receptor clip: http://www.nlm.nih.gov/medlineplus/e ncy/anatomyvideos/000054.htm

20. ACUTE VS. CHRONIC PAIN Acute pain fibers: Relatively thin, myelinated Rapid impulse conduction, causing sharp pain Chronic pain fibers: Thin, unmyelinated Conduct impulses slowly, produce a dull aching sensation

21. REFERRED PAIN may occur due to sensory impulses from two regions following a common nerve pathway to brain Ex: Someone experiencing a heart attack may feel pain in their left shoulder

22. REVIEW What receptors detect deep pressure? What is the difference between acute and chronic pain? Where do you have the most receptive fields? **Monday- bring your books and notes to class! We are going to start reviewing for midterms.