[The dermal amyelinic system and its endings in psoriasis]

After having reviewed the classical notions of normal skin innervation, the authors study the dermal amyelinic system in 12 patients suffering from psoriasis, using the cholinesterase method and the method of Bielchowski-Gross Jabonero. They successively describe the superficial network with the crooked isolated neurite rising to the tip of the papillae, the perivascular system which spreads out with the vessels themselves, and the hyperplastic perisudoriparous network with its peripilary endings. These findings clearly differ from those of Weddel. The amyelinic system appears to be little changed in psoriasis. The circumscribed nature of the morphological changes, however, should not deny it a role in the physiopathology of this dermatosis. A few recent hypotheses in this regard are discussed.