The third alternative: Duplication of collopallium in isocortical evolution
Ann B. Butler a1 a1 Krasnow Institute for Advanced Study, George Mason University, Fairfax, VA 22030
abbutler@gmu.edu
Abstract
One hypothesis of isocortical evolution requires tangential migration of glutaminergic neurons. A second requires invasion of collothalamic afferents into the dorsal pallium, a territory that in sauropsids is solely lemnopallial. A third alternative is noted here – duplication of the original collopallial territory. The duplicated region would be formed by radial migration of excitatory neurons and would maintain its collothalamic innervation.
