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Sources:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4081479/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6502296/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3557753/
https://www.science.org/doi/abs/10.1126/science.aaf4918
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3796138/
https://www.cell.com/neuron/fulltext/S0896-6273(14)00901-5
https://www.cell.com/neuron/fulltext/S0896-6273(19)30293-4
https://www.abc.net.au/news/2018-07-27/curious-north-coast-the-itch-that-moves/10036144?nw=0&r=HtmlFragment
https://www.eurekalert.org/news-releases/663433
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7297978/
Image Sources:
https://www.istockphoto.com/photo/senior-man-scratching-his-back-with-a-back-scratcher-gm1336031393-417438889
https://www.istockphoto.com/photo/3d-rendered-medically-accurate-illustration-of-a-female-nervous-system-gm1257022420-368239637
https://www.istockphoto.com/photo/brown-dog-scratching-itself-gm1155876248-314839876
https://www.istockphoto.com/photo/muslim-woman-with-skin-allergy-gm1192275904-338695708
https://www.istockphoto.com/photo/young-black-man-scratching-his-itching-hand-gm1199684950-343340977
https://www.storyblocks.com/video/stock/scratching-body-itchy-arm-from-allergies-bae35pcdrk15o4kw3
https://www.istockphoto.com/photo/huh-i-dont-get-it-gm870079774-144949967
https://commons.wikimedia.org/wiki/File:Blausen_0822_SpinalCord.png