The mammillary axonal complex is formed by the axons from the lateral, medial mammillary and the dorsal premammillary nuclei which share a branching pattern. Every neuron gives off one axonal stem that bifurcates into 2 branches. One of the branches is directed dorsally to the thalamus and another caudally to the midbrain[GO]. [ http://amigo.geneontology.org/amigo/term/GO:0061373 ]