Hindu Achievements in Exact Science: A Study in the History of Scientific Development c20.s5.4

c20.s5.4

3. Familiarity with the lateral ventricles of the brain (through the fourth and third ventricles);
4. Familiarity with the ganglia and plexuses of the cerebro-spinal system;
5. The idea that the brain is composed of *chandra-kala* or convolutions resembling half-moons;
6. The idea that the six *chakras* are the vital and important sympathetic plexuses, presiding over all the functions of organic life. Yoga or contemplation means con-trol over the functions of these plexuses.