Why a good scratch quells an itch

 作者:平趱围     |      日期:2019-03-08 09:04:01
THERE’S nothing like a good scratch, but how does it take away the itchiness? Researchers have identified the neurons in monkeys that are dampened by scratching, a finding that could lead to new ways of alleviating itching in humans. In people, a variety of stimuli, including chemicals like histamine, prompt sensory neurons to fire, sending a signal via the spinothalamic tract (STT) to the brain, prompting an itchy feeling. To find out which of these neurons are suppressed by scratching,