Fig. (2) Schematic representation of the dorsal diencephalic conduction system; DDCS which is composed of stria medullaris; SM, habenula; Hb and fasciculus retroflexus; FR. fibres from Forebrain; FB, Diencephalon; D and Basal Ganglia; BG to form a single unidirectional tract known as the SM, it arches posteroinferiorly over the inter-thalamic adhesion, and terminates at both lateral habenular nucleus; LHb and medial habenular nucleus; MHb, and from there they pass through FR to reach the Midbraib; MB.