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Touch and Pain (Psychological factors influencing pain (Early experience…
Touch and Pain
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Somatosenses
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Cutaneous sense - (skin sense) involves touch, pain and temperature
Proprioception and Kinaesthesia - provides sensory information about the body position and movements - stretch receptors
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Perception of pain
Pain receptors are nociceptors- detect noxious stimuli. They have free nerve endings. pain travels in lightly militated A delta fibres (well localised and brief) and unmylinated c fibres
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Pain is subjective
Sensory signal in CNS. Pain perception depends on complex neural interactions where impulses generated by tissue damage and modified by: ascending systems (from peripheral to CNS); Descending systems (sent from brain to peripheral)
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Anatomy of Skin
Consists of subcutaneous tissue, dermis and epidermis. Hairy and glabrous skin controls various receptors of different level. Glamorous skin does not contain hair, found on palms of hands and soles of feet. There are more receptors on glabrous skin as they come into contact with more things.Skin is a vital organ for survival
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Somatosensory Cortex
There are two main areas, primary (S1) and secondary (S2) somatosensory cortex. It has a somtopic arrangement which maintains organisation with CNS. Your mouth, tongue and hands have an increased area size compared to the others.
Phantom Limb Pain
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Theory of cross wiring - S1 areas near hand (arm/face) take over 're-map' the hand region. Thus stroking the face may be interpreted as sensation in missing limb
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