The peripheral cutaneous nervous system is associated with the deliver
y of neuropeptides that modulate inflammatory and proliferative proces
ses. The focus of this article is on the network of nerves associated
with the normal human hair follicle and those affected by alopecia are
ata or androgenetic alopecia. Methods used to study nerves and current
concepts about the innervation of the human scalp hair follicle are r
eviewed.