The study was performed on 7 female dogs, in which the experimental procedure depending on lateral or bilateral extirpation of the mammary gland complexes with leaving the skin was carried out. One dog constitued the control group. All animals were kept alive for 21 days, after which they were put to sleep and the following material was taken for further examination: the brain stem, the thoracic-lumbar-sacral part of the spinal cord with adeqate nerve ganglia, sympathetic trunk ganglia and the following ganglia and plexuses of abdominal and pelvic cavity: celiac, cranial mesenteric, intermesenteric, caudal mesenteric, hypogastric and pelvic. The material was fixed in formalin, dehydrated in alcohol and after embedding in paraffin – cut into 15μm thick slides. The slides were stained according to Klűver-Barrera’s method and Nissel’s method. The comparison of the retrograde changes in neurons in the experimental animals with the localization of similar changes effected by the same operational procedure in the control animal gave rise to establishing of the localization of the nerve cells being the source of origin of visceral-sensory neurons reaching the mammary gland in female dog. The results of the study point directly to the fact that afferent nerve fibres supporting the mammary gland in female dog come mainly from complex of spinal ganglia.

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