NEW335H1 Lecture Notes - Lecture 8: Noxious Stimulus, Withdrawal Reflex, Nociceptor
Document Summary
Associated with tissue injury (i. e. headache, joint pain, physical injury) Tissue injuries following exposure to a noxious stimuli. The feeling that such an injury has occurred. Pain can be defined as a distressing experience that is associated with: Pain is believed to be an adaptive response which allows to perform withdrawal reflex. Insensitive to pain can result in high frequency of injury or death. Acute pain occurs following an injury and is expected to overlap with the healing process for that injury. Chronic pain is persistent pain (more than 3 months) About 20-40% of the world s population may suffer from chronic pain at one point in their life. Results in reduced quality of life, mood disturbance, impaired memory and reduced employment functioning. Cases of severe chronic pain is an interest in complementary alternative medicine. Nociceptive pain: nociceptors in tissues send pain signals to cns. Neuropathic pain: damage to the nerve itself causes typical pain symptoms.
