15 Sensory physiolog pain

15 Sensory physiolog pain - Biology141(Physiology 1:03 AM...

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4/6/08 1:03 AM Biology141 (Physiology) Page 1 of 3 https://courses.bio.psu.edu/spring2008/biol141/Lecture%2015(2008).htm Biology141 (Physiology) Lecture 15 M. Whim SENSORY PHYSIOLOGY AND PAIN. [1]. BACKGROUND TO PAIN. pain is: an unpleasant sensation(s) caused by tissue injury. pain detection mediated by specialized receptors ( nociceptors ). dense on skin and found on virtually all organs (with which notable exception?). it is useful. [2]. THE TWO TYPES OF NOCICEPTOR AFFERENTS. corresponding to different pain sensations: (a). Myelinated pain fibres. AP’s conducted at 12 – 30 m/sec by A delta fibers. respond to mechanical stimuli. produce sensation of fast (first) pain. how is this perceived? (b). Unmyelinated pain fibres. AP’s conducted at 0.5 – 2 m/sec by C fibers. respond to chemical stimuli. produce sensation of slow (second) pain. how is slow pain perceived?
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This note was uploaded on 04/05/2008 for the course BIOL 141 taught by Professor Viti,janehartwel during the Spring '08 term at Penn State.

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15 Sensory physiolog pain - Biology141(Physiology 1:03 AM...

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