A patient tells the nurse that he has had deep, burning muscle pain for most of his adult life. What does this information tell the nurse about how the patient's pain is being transmitted in the body?
1. C fibers
2. A-delta fibers
3. endorphins
4. dynorphins
Correct Answer: 1
The pain from deep body structures, such as muscles and viscera, is primarily transmitted by C fibers, producing diffuse burning or aching sensations. A-delta fibers are myelinated and transmit impulses rapidly. They produce what is called fast pain or first pain, which is sharp, well-defined pain typically accompanying cuts, electric shocks, or the impact of a blow. Endorphins and dynorphins are endogenous opioids that block the transmission of painful impulses.
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