Kinesiology 2236A/B Lecture 5: Lecture 5 Injuries

• School: Western University
• Department: Kinesiology
• Course: Kinesiology 2236A/B
• Professor: Dave Humphreys

Document Summary

Pain transmission: pain receptors called nocioceptors are sensitive to, mechanical, chemical, thermal (hot and cold, afferent nerve fibres carry information"s from nocioceptors towards the spinal cord. Two types of pain signals: a delta- myelinated- fast pain. Located in skin: c fibres- unmyelinated- slow pain, small diameter, pain and temperature. Gate control theory of pain: pain will travels to t cell, sg has inhibitory effect. Gate control- step by step: without any stimulation, both a beta (large) and small c nerve fibers are quiet and the sg and inhibitory interneuron block the signal in the t cell that connects to thebrain. They block the inhibitory sg and activate the t cells. the brain. The "gate is open", therefore, pain: when sg is turned down, it cant block t cell and it get info from c fibres and you feel pain, with non-painful stimulation, large nerve fibers (a beta) are activated primarily.