PSYC 365 Lecture Notes - Lecture 8: Afferent Nerve Fiber, Substantia Gelatinosa Of Rolando, Peripheral Nervous System
13 Apr 2016
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Document Summary
When a person comes in contact w/ injurious simuli, signals of issue damage follow a paricular route from aferent / sensory neurons of the peripheral nervous system to the spinal cord and then to the brain. Aferent / sensory neurons: conduct impulses from a sense organ to the central nervous system, or from lower to higher levels in the spinal cord & brain. Nociceptors: the aferent nerve endings that respond to pain simuli; when acivated, these generate impulses that travel to the cns. A-delta ibers: the aferent peripheral ibers that are associated w/ transmiing sharp, disinct pain; small & myelinated. C-ibers: the aferent peripheral ibers that are associated w/ transmiing difuse, dull / aching pain; transmit more slowly because they are unmyelinated; comprise over 60% of all sensory aferents. Aferent ibers group together ater leaving the periphery forms a nerve. Nerves then enter the dorsal horns of the spinal cord; these contain several layers/ laminae.
