Sensation
The afferent fibers of the autonomic nervous system, which transmit sensory information from the internal organs of the body back to the central nervous system, are not divided into parasympathetic and sympathetic fibers as the efferent fibers are. Instead, autonomic sensory information is conducted by general visceral afferent fibers.
General visceral afferent sensations are mostly unconscious visceral motor reflex sensations from hollow organs and glands that are transmitted to the CNS. While the unconscious reflex arcs normally are undetectable, in certain instances they may send pain sensations to the CNS masked as referred pain. If the peritoneal cavity becomes inflamed or if the bowel is suddenly distended, the body will interpret the afferent pain stimulus as somatic in origin. This pain is usually non-localized. The pain is also usually referred to dermatomes that are at the same spinal nerve level as the visceral afferent synapse.
Read more about this topic: Parasympathetic Nervous System
Famous quotes containing the word sensation:
“Strictly speaking, there is but one real evil: I mean acute pain. All other complaints are so considerably diminished by time that it is plain the grief is owing to our passion, since the sensation of it vanishes when that is over.”
—Mary Wortley, Lady Montagu (1689–1762)
“... [f]or a sensation to be felt as pain is for it to be pain.”
—Saul Kripke (b. 1940)
“... the moment we try to fix our attention upon consciousness and to see what, distinctly, it is, it seems to vanish: it seems as if we had before us a mere emptiness. When we try to introspect the sensation of blue, all we can see is the blue; the other element is as if it were diaphanous. Yet it can be distinguished if we look attentively enough, and know that there is something to look for.”
—George Edward Moore (1873–1958)