[Neural connections in the septum of lizards studied by the method of horseradish peroxidase axonal transport].

Septal connections in lizards (Ophisaurus apodus) were studied by means of the massive iontophoretic HRP injection into the septum. Reciprocal connections between the septum and both dorsal and mediodorsal cortex, projections of the nucleus of Broca diagonal band and anterior thalamic nuclei (mainly dorsolateral) to the septum were revealed. Reciprocal connections of the septum with the preoptic area, periventricular hypothalamic structures containing dopaminergic neurons, as well as with the nuclei of the mammillary complex were shown to be the most massive. HRP injection into the mammillary complex revealed mainly anterolateral location of neurons projecting to the mammillary nuclei and dorsolateral terminal field of mammillo-septal projections. Some peculiarities and common features in hodological organization of the septum in reptiles and mammals are considered.