Physiology of Pain PDF

contact us : [email protected] Physiology of Pain Physiology Team 434 Color index CN Guyton ch.48 p583 - Important...

contact us : [email protected] Physiology of Pain Physiology Team 434 Color index CN Guyton ch.48 p583 - Important Dr.Najeeb’s videos are - Further Explanation recommended “Ascending tracts” Contents Recommended Videos! Mind map.......................................................3 Pain………………………………………………4 Classification of Nerve Fibers………………. 5 Pain Receptors “ Nociceptors”……………..6 Pain Reception and perception……………7 Reactions associated with pain sensation..8 Mechanism of stimulation of Nociceptors...9 Axon Reflex…………………………………….10 Pain mechanism…………………………….. 11 Classification of pain…………………………12 Qualities of pain………………………………13 Types Of Pain …………………………………14 Referred pain………………………………….16 Mechanism of referred pain………………..18 Pathway of pain………………………………19 Role of cerebral cortex in pain perception..21 Please check out this link before viewing the file to know if there are 2 any additions/changes or corrections. The same link will be used for all of our work Physiology Edit 3" Mind Map Pain Free nerve endings receptors sense only pain and temperature !Pain is unpleasant sensory and emotional experience associated with actual or potential tissue damage. !Pain is Characterized By: !It has a protective function !Accompanied by behavioral responses (withdrawal, defense) as well emotional responses (crying , fear ) !All pain receptors are free nerve endings of unmyelinated C fibers & small diameter myelinated Aδ fibers. !Pain receptors are the most widely distributed. !Pain receptor widespread in the superficial layer of the skin ,fewer in the deep tissues and absent in brain tissue. 4"  Classification of Nerve Fibers Roman Letter Size (µm) Conduction Myelination Numeral Velocity Ia - 12-20 70-120 √√√√√ Ib - 12-20 70-120 √√√√√ - A 12-20 70-120 √√√√√ II A 6-12 30-70 √√√√ - A 2-20 10-50 √√√ III A 1-6 5-30 √√ - B