FIGURE 8-10 Neuronal Migration (A) Neuroscientists hypothesize that the cortical MAP is represented in the subventricular zone. (B) Radial glial fibers extend from the subventricular zone to the cortical surface. (C) Neurons migrate along the radial glial fibers that take them from the protoMAP in the subventricular zone to the corresponding region in the cortex.

Information from P. Rakic (1974). Neurons in rhesus monkey cerebral cortex: Systematic relation between time of origin and eventual disposition. Science, 183, p. 425.