Definition, Purpose Receptors – Types ,Algogenic substances Properties of pain Types of pain – Fast/Slow, Superficial/ Deep Causes of Muscular pain/ visceral pain Pain pathway – Paleospinothalamic tract / Neospinothalamic tract Pain inhibiting pathway Opioids ,Gate control theory of pain,Referred pain Applied aspects – Analgesic, Acupuncture, Hyperalgesia, Causalgia, Surgeries for pain