The desert locust (Shistocerca Gregaria), always abreviated Sg, played a central role in my father’s work. SgAd was short for the adult animal.

Position of the brain in the Schistocerca gregaria (Desert Locust)

FIGURE 4.1

Diagram illustrating the position of the brain (black) within the head of Schistocerca gregaria.

The original drawing for diagram of the midbrain

The following drawing is about A0 size.