Transcript Touch - Ms. Engel @ South

Touch
That mildly important sense we use to operate…
{
Ruthy Allard
Joseph Busaba
Noa Golan
Nicole L. Kestenberg
Emily Malec-Brown
But in all seriousness…
Umbrella of “Touch” is somatosensory
pain
Pain
-skin, teeth, muscles, joints, bones, & visceral muscles
-only sense created from within
-a type of first order neuron
Pain
1. sharp
Other First Order Neurons
Why do we feel the pressure on our skin before we feel pain?
3.pressure “sense”
A-fibers deeper in the skin
thicker than a-delta & c-fibers
end capsule as receptors
4.other senses
A-alpha nerve fibers  proprioception (muscle sense)
A-beta nerve fibers  touch
Second Order Neurons
nerves enter
Third Order Neurons
-begins in Thalamus
-ends in cerebral cortex!
Thermoception
definition: how animals feel, perceive, & react to temperature change
first order neurons
A-Delta & C-fibers
nerve endings open TRP channels
third order neurons
hypothalamus controls thermoregulation
Congenital Insensitivity to Pain with Anhidrosis
genetic mutation
nerve cells do not transmit pain and temperature information
 no temperature regulation= no sweating
Brief History of Experimentation that led us to
understanding pain, touch, and thermoception
1800s:
-psychophysical experiments supported by structure of
organs
1920s and 1930s:
-only animals
-electrical recordings of stimulus from the sensory
receptors cover the entire nervous system
recent:
-imaging of active brain parts during sensory sensations
Bibliography:
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Haga, Nobuhiko, and Masahiro Iijima. "Evaluation of nonnociceptive sensation in patients with
congenital insensitivity to pain with anhidrosis." Child's Nervous System 26.8 (2010): 1085+.
Health Reference Center Academic. Web. 23 Oct. 2011.
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<http://www.educ.uidaho.edu/.../PAIN
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Jennett. Oxford: Oxford UP, 2001. 636-37. Print.
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