[Cortico-cortical connections of the orbito-frontal cortex]

Using strychnine neuronography, the connections of proreal and orbital convolutions with different sections of the neocortex were studied, in cats. The proreal cortex was found to have direct efferent connections with premotor, motor, and associative sections of the sigmoid gyrus and with the anterior lateral convolution. Besides, the orbital convolution has connections with the auditory, visual, and associative sections of the neocortex. The orbital cortex was concluded to be the basic efferent system of the orbito--frontal cortex providing the latter's conncetions with different sections of the neocortex; the proreal cortex projects efferents only to adjacent sections of the frontal cortex.