[Afferent pathway from locus coeruleus to the nucleus solitarius]

After the destruction of the nucleus tractas solitarii, just caudally to the writing pen by means of a stereotaxic instrument, the system of afferent fibres to the nucleus in question was investigated by the methods of Nauta and Fink--Heimer. The fibre terminals were revealed near locus coeruleus. Investigation of the locus coeruleus by Golgi method demonstrated that it usually has neurons of reticular type and transitional ones which resemble by their form the neurons specific for sensory formations. It is possible to conclude that locus coeruleus posesses connections of visceral origin which may play a part in the afferent influence of locus coeruleus on the brain cortex.