[Cellular distribution of substance P in the rat adrenal medulla].

Substance P-like immunoreactivity (SPLIR) has been found in fibres and the surroundings of ganglion cells and in a new cell type of rat adrenal medulla, using the indirect immunohistochemical method. These SPLIR-cells are characterized by their localization in the connective tissue in close vicinity of vessels and by acidophilic staining in HE-procedure. Relationships are discussed between the localization of substance P in the adrenal medulla and possible interactions with catecholamines with respect to stress.