Figure 7.

Illustration of the formation of asymmetry of the cerebral hemispheres. Since it was first described by Paul Yakovlev, it is also called Yakovlev’s twisting (torque) of the brain in a counterclockwise direction (Yakovlev cerebral anticlockwise torque). In the diagram, the twist is not shown from above, but from below (so in this view it is clockwise). Twisting also leads to asymmetry of the protrusion of the inner surface of the skull bones (petalia) as the bones adapt to the shape of the brain (and not vice versa). The scheme is from commons.wikimedia.org.