Physiology 3120 Lecture Notes - Lecture 13: Group C Nerve Fiber, Spinothalamic Tract, Posterior Column
28 Dec 2017
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Document Summary
Somatosensory system: a multitude of ways to receive inputs from the body. Includes tactile inputs from the skin, joint receptors, muscle receptors, etc. System can extract information from sense of touch. Even though we have the machinery in the somatosensory system as a blind person, we. Different populations of receptors with different modalities. Different combinations associated with different kinds of receptors = influx to cns. Nature (quality) and intensity (quantity) of environmental stimuli. Quality, nature of the stimuli is signaled by: specificity of the receptor for one type (modality) of stimulus (i. e. adequate stimulus, variety of receptors signal various dynamic features of stimulus. Quantity, increase in intensity is signaled by: Increased frequency of discharge of a single afferent (frequency code: recruitment of more receptors with higher thresholds (population code) Different types of neurons are attributed to different kinds of receptors and actions. Different neurons provide different information to the nervous system.
