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In the abdomen, general visceral afferent fibers usually accompany sympathetic efferent fibers. This means that a signal traveling in an afferent fiber will begin at sensory receptors in the afferent fiber's target organ, travel up to the ganglion where the sympathetic efferent fiber synapses, continue back along a splanchnic nerve from the ganglion into the sympathetic trunk, move into a ...
The distinction between special and general senses is used to classify nerve fibers running to and from the central nervous system – information from special senses is carried in special somatic afferents and special visceral afferents.
Special visceral afferent fibers (SVA) are afferent fibers that develop in association with the gastrointestinal tract. [1] They carry the special sense of taste (gustation). The cranial nerves containing SVA fibers are the facial nerve (VII), the glossopharyngeal nerve (IX), and the vagus nerve (X). [ 2 ]
The visceral sensory system - technically not a part of the autonomic nervous system - is composed of primary neurons located in cranial sensory ganglia: the geniculate, petrosal and nodose ganglia, appended respectively to cranial nerves VII, IX and X.
Most sensory systems have a quiescent state, that is, the state that a sensory system converges to when there is no input. [citation needed] This is well-defined for a linear time-invariant system, whose input space is a vector space, and thus by definition has a point of zero. It is also well-defined for any passive sensory system, that is, a ...
Types of afferent fibers include the general somatic, the general visceral, the special somatic and the special visceral afferent fibers. Alternatively, in the sensory system, afferent fibers can be classified by sizes with category specifications depending on if they innervate the skins or muscles. [4] [5]
The concept of interoception was introduced in 1906 by the Nobel Laureate Sir Charles S. Sherrington.He did not use the noun interoception, but did describe as interoceptive [12] those receptors that are within the viscera—what are today called "visceroceptive"—and thus excluded all other receptors and information from the body, which he grouped as either exteroceptive or proprioceptive.
General visceral afferent fiber (GVA) Special visceral afferent fiber (SVA) References