Do Now

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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!

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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!. Objectives. Identify and explain the different types of sensory receptors. - PowerPoint PPT Presentation

Transcript of Do Now

Page 1: Do Now

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!

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OBJECTIVES

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

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SPECIAL SENSES

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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

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DO NOW

• What is phantom pain?• What causes it?• What is mirror therapy?• How else could someone alleviate this pain?

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OBJECTIVES

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

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PHANTOM PAIN

• http://www.youtube.com/watch?v=hlQZmNlPdHQ

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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

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RECEPTIVE FIELDS

• Remember the 2 point discrimination in the lab? • Which part of your body had a larger receptive field?

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SENSORY ADAPTATION

• Before reading this sentence, could you feel your clothes on your skin? • The ability to ignore unimportant stimuli is called

sensory adaptation.

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RECEPTOR CATEGORIES

• Somatic senses • touch, pressure, pain

Specialized senses

smell, taste, hearing, equilibrium, vision

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SOMATIC RECEPTORS

• Chemoreceptors• Thermoreceptors• Photoreceptors• Mechanoreceptors• Pain receptors (Nociceptors)

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CHEMORECEPTORS

• respond to changes in chemical concentrations• Ex: Monitor CO2 levels in blood and pH

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THERMORECEPTORS

• Respond to changes in temperature

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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.•

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PHOTORECEPTORS

• Responds to light• Rods- respond to light• Cones- respond to colors

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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?

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MECHANORECEPTORSFree nerve endings• common in epithelial tissues• simplest receptors• sense itchingMeissner’s corpuscles• abundant in hairless portions of

skin; lips• detect fine touch; distinguish

between two points on the skinPacinian corpuscles• common in deeper subcutaneous

tissues, tendons, and ligaments• detect heavy pressure and

vibrations

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PAIN RECEPTORS

• “Nociceptors”- • found on free nerve endings • Respond to tissue damage

Pain receptor clip: http://www.nlm.nih.gov/medlineplus/ency/anatomyvideos/000054.htm

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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

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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

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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.