<p>Nerves that stimulate skin are grouped in structures next to the spinal cord. Here, nerves in such a structure—called a dorsal root ganglion—that are involved in detecting an itch are labeled green. Nerves involved in sensing pain, temperature and other stimuli are shown in magenta.
</p>
Credit: Hans Juergen Solinski, National Institute of Dental and Craniofacial Research
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/64860478@N05">National Center for Advancing Translational Sciences</a> from Bethesda, MD
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/64860478@N05/48905779046/">An Itch to Scratch</a>