D. THE DEVELOPMENT OF THE HUMAN BRAIN
In our view, bipedalism not only preceded the further development of cranial bones in humans
but also induced it. Clinical findings based on examinations and treatments of patients with
a wide variety of traumas substantiate the theory that there is an unidirectional line of
association between the calcaneus and the muscle tissues surrounding the bone on the one hand
and between the cranium and the muscle tissues of the face and skull on the other hand.
Bipedalism has modified the size, shape, and general configuration of the calcaneus, and this
remodeling has, in turn, led to a parallel revamping of the cranial bones and of the central
nervous system. New neural connections and new neural coordination centers have been created
for equilibrium, walking, and running, and specialized motor and sensory neurons have appeared
to control the extremities. As a result, the size of the brain and the cranial capacity started
to increase. The temporal, parietal, and frontal bones expanded, giving the cranium a higher and
more rounded appearance (see Figure 2-3A).
The cerebral hemispheres became larger and more convoluted around the central sulcus, in the precentral
and postcentral gyri and in the frontal lobes. Simultaneously, the afferent sensory neurons and efferent
motor fibers increasingly began to decussate and pack more information in the opposite cerebral and
Contralateral motion is the most logical explanation for the development of the brain in Modern Man.
The hand and the foot are the extension of the cerebral cortex in both motor control and sensory
perception. But, the cerebral cortex is also an extension of the hand and foot, and we could almost
venture to say that, over the thousands of years of human evolution, the hand and the foot have
acted as mentors to the brain. All the refined and accurate sensori stimuli originating in the
extremities reach the cerebral cortex, which itself control all the refined movements of the hands,
fingers, feet, and toes through the cortico-spinal tract.