By means of neurohistological and histochemical methods using serial sections of the embryos at the age of 12-30 days of development, the premediatory and beginning of the mediatory stages in development of cholinergic and adrenergic neural plexuses have been studied in rabbit small pelvis. Appearance of catecholamine-containing cells at early mediatory stages and a gradual development and complication of the cholinergic and adrenergic neural plexuses structure are demonstrated. By birth in the rabbit small pelvis area, some elements of cholinergic and adrenergic structures begin to form.