Kaya sing wis ditulis ing teks kasebut, sternum minangka sisa-sisa vestigial ing ngarep- utawa kolom alam saka badan sing sampurna, - kanggo "tiba" saka wong sing nindakake.

Gambar VI-E

Ing hubungan iki migunani kanggo ngutip saka "Buku Teks Anatomi," edisi 4th, CNXX:

Morfologi sistem syaraf simpatik:

“The phylogenetic relation of the sympathetic and the cerebro-spinal elements in the system it is impossible to determine. It may be that the sympathetic system is the representative of an ancient architecture independent of the cerebro-spinal nervous system, the materials of which are utilized for a more modern nervous system; or it may be that the correlation of spinal nerves and sympathetic are both the consequences of the formation of new organs and structures in the splanchnic area. Examined in every light, it possesses features which effectually differentiate it from the cerebro-spinal system, although it has become inextricably united with it and subservient to it.”