Thermoreceptors

Changes in ambient temperature are monitored by separate cold and warm thermoreceptors in the skin. Each receptor has a receptive field size of approximately 1 mm in diameter with little overlap between adjacent receptive fields. These individual domains can be mapped experimentally to demonstrate that small, discrete areas of skin can produce either warm or cold sensations, but not both. Both thermoreceptor subtypes are most sensitive to abrupt changes in temperature and adapt to a new stimulus level within several seconds. They are also limited in their response range. Heat receptors are active at temperatures of 30 to 45° C, at which point they become silent and nociceptive thermoreceptors

Pacinian corpuscle

A. tiny movement movement mV -L

50 mV

recording electrodes B. small movement mV -L

50 mV

generator potential

J action potentials time-

recording electrodes B. small movement

J action potentials time-

D. moderate movement connective tissue removed
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