Psychology 2036A/B Lecture Notes - Lecture 8: Afferent Nerve Fiber, Critical Limb Ischemia, Nociceptor

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The nerves then enter the dorsal horns of the spinal cord; these contain several layers, or laminae, each of which receives incoming messages from afferent neurons. Sensory aspects of pain are strongly influenced by activity in a-delta fibres, which send messages through the thalamus o(cid:374) thei(cid:396) (cid:449)a(cid:455) to the (cid:271)(cid:396)ai(cid:374)"s (cid:272)e(cid:396)e(cid:271)(cid:396)al (cid:272)o(cid:396)te(cid:454). The motivational and affective elements of pain appear to be more heavily determined by the c-fibres, which send pain messages to the brain stem and lower portions of the forebrain. Leading pain theory, very few limitations: recognizes the contribution of psychological factors to our perception of pain. States that a gate like mechanism in the spinal column"s dorsal horns: controls pain stimulation to the brain. Intense involvement in other activities, or relaxation, or positive experiences can mute the pain experience by causing the gate to close: ex. during world war ii. An injury or wound sustained by a civilian produces pain (the gate is open).

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