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An overview of the different structures detecting different sensations in the skin

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  1. 1. C.RiedingerOverview of somatosensory receptors ReceptiveName Type Location Adaptation Task Afferent fibres field specialised superficialMeissners corpuscle mechanoR small fast fine localisation of rapidly changing stimuli A-beta (<keratin) ending specialised deep (in fatty high frequency (300Hz) vibrationPacinian corpuscle mechanoR large fast A-beta layer) cant localise source ending specialised superficial best at reading BrailleMerkels disk mechanoR small slow A-beta (<keratin) slowly moving stimulus ending specialised deep (in fattyRuffini ending mechanoR large slow deep pressure A-beta layer) ending free nerve fires around 40*CHot temperature receptor ending, TRP slow AC responds to capsaicin (chilli) ion channels free nerveCold temperature fires around 20*C ending, TRP slow A-deltareceptor responds to menthol ion channels free nerveVery cold temperature fires around 10*C ending, TRP slow A-deltareceptor responds to isocyanates (wasabi) ion channels not specific=MULTIMODAL respond to a wide range of ihigh threshold noxious free nerveNociceptor sensitise!! (painful) stimuli, e.g. strong mechanical pressure, cold A-delta and AC ending <15*C, heat >43*C, chemicals sensitise to prolongued stimulus embedded in group I=A-alphaProprioceptors muscle spindles muscle fibres - fast detect the length of muscle (slow and fast(muscle length) nuclear bag 1/1000 adapting) embedded inProprioceptors muscle spindles group I and II=A-beta muscle fibres - slow detect the length of muscle(muscle length) nuclear chain (slow) 1/1000Proprioceptors (stretch) tendons Ib (medium and fast) in jointProprioceptors (joint) Ruffini type signal joint angle in extreme angles, not mid-way capsule