The sensory neurons of the face have their cell bodies in the trigeminal nuclei and those around the genitalia are located in the sacral nuclei.

面部感觉神经元的胞体位于三叉神经核内，生殖器周围神经元的胞体位于骶核内。

Since the trigeminal and sacral nuclei serve just one side of the face or body, herpes vesicles and ulcers develop on the ipsilateral or same side as the affected nuclei.

因为三叉神经核和骶神经核只支配脸部或身体的一侧，所以，疱疹和溃疡也发生在被感染的神经核的同侧。