1. Somatic and Special Senses Anatomy ch. 10

2. Touch and Pressure Senses  Come from 3 types of receptors:  1. Sensory nerve fibers- touch and pressure  2. Meissner’s corpuscles- light touch On lips, palms, fingertips On lips, palms, fingertips  3. Pacinian corpuscles- heavy pressure; In tendons and ligaments In tendons and ligaments

4.  Heat receptors-most sensitive to temps above 77 F; above 113 F, they stimulate pain.  Cold receptors-most sensitive to temps 50-60 F; below 50 F, they stimulate pain  HowStuffWorks Videos "Heat: How the Human Body Regulates Its Temperature" HowStuffWorks Videos "Heat: How the Human Body Regulates Its Temperature" HowStuffWorks Videos "Heat: How the Human Body Regulates Its Temperature"

7. Pain!!

8.  Only place that lacks pain receptors is your brain!  Fig 10.2-Referred pain Feels like its coming from somewhere else Feels like its coming from somewhere else

9. Acute pain receptors  Thin, myelinated nerve fibers

10. Chronic pain receptors  Thin, unmyelinated nerve fibers  Produce a dull, aching pain  Can be difficult to pinpoint

11. Looks like it kinda hurts  painful funny accidents - Google Video painful funny accidents - Google Video painful funny accidents - Google Video  tubing wipeouts - Google Video tubing wipeouts - Google Video tubing wipeouts - Google Video

12.  Cerebral cortex determines pain intensity  Body has inhibiting substances, such as serotonin, endorphins, and enkephalins, which can block pain, or dull it.  Released from hypothalamus and pituitary gland