Table 1.

Development of the central nervous system of possible forerunners of humans.

^*Chorda dorsalis (not shown).

^**In the hagfish and lamprey, the striatum can also be considered a forerunner of the nuclear amygdala.

^***Only nuclear amygdala is considered; the cortical areas are represented by part of the pallium.

^****Hippocampal pallium is present in hagfishes and lampreys but not yet clearly developed.

Figures are modified from Nieuwenhuys (1998).

Color code correspond to structures in figures.