Relationship between follicular nerve supply and alopecia

The peripheral cutaneous nervous system is associated with the delivery of neuropeptides that modulate inflammatory and proliferative processes. The focus of this article is on the network of nerves associated with the normal human hair follicle and those affected by alopecia areata or androgenetic alopecia. Methods used to study nerves and current concepts about the innervation of the human scalp hair follicle are reviewed.