Figure 3.

Commissural and longitudinal projections in the forebrain. Both glial and neuronal structures are associated with axonal tracts in the brain. (A–C) depict commissural tracts in schematics of horizontal sections from dorsal to ventral. (A and B) are schematics of the brain, whereas C is a ventral view of the head. Associated with the corpus callosum (blue tract in A) are the glial wedge and indusium griseum glia and the sling cells. Glia are also associated with the hippocampal commissure (purple tract in A) the anterior commissure (green tract in B) and the optic chiasm (red crossing fibers in C). In (D), longitudinal tracts are shown, including the corticothalamic, thalamocortical, cortico-collicular and corticospinal tacts that all pass through the internal capsule. Associated with the internal capsule are the corridor cells. The lateral olfactory tract (LOT) is also shown in D, together with the LOT cells. All schematics are of sections of mouse brain or head at embryonic day 18.