Subpallium

The pallium (and especially the archipallium) are more sensitive to the absence of olfactory morphogenetic influences than the subpallium.

2017, C. Watson, A. Mitchelle, L. Puelles, 2.02: A New Mammalian Brain Ontology Based on Developmental Gene Expression, Georg F. Striedter (volume editor), Jon H. Kaas (editor-in-chief), Evolution of Nervous Systems, Volume 1, 2nd Edition, Elsevier (Academic Press), page 60, The pallium is initially separated from the subpallium on account of its differential molecular identity, which causes pallial neurons to the glutamatergic as a rule, whereas subpallial neurons are GABAergic in various peptidergic flavors, depending on the precise origins (Stühmer et al.,2002).

Channeling of TCAs^([thalamocortical axons]) into the subpallium also relies on early axonal projections between the prethalamus and the subpallium (Feng et al., 2016).