One of the most startling examples of how the mudras actually controls physical functions of the body is to be seen in the group of mudras and manipulation of the fingers used in pranayama Yoga for the control of the various lobular segments of the lobes or areas. They are lower lobes, middle lobes and upper lobes. The lower lobe breathing is called ‘kanishta pranayama’. The upper lobe breathing is called jyeshtha pranayama.
The lungs as is the case of the brain, have lobes; the lower, the middle and the upper. In the normal respiration of man, air mostly goes only into the middle lobe, leaving the lower and upper lobe non-flushed. These two parts of the lungs, where there is a build up of dirty and poisonous air remains non-flushed and locked up. This often proves to be the cause of many diseases, similar to the case of the colon (large intestine) where fecal matter remains accumulated forming a thick layer on the sides. Modern life is such that the brisk movements and quick bending of the trunk are common to humans. As a result of this, the sedentary life of the modern office worker, the upper and lower lobe of the lungs seldom gets their due share of oxygen and prana.
In the lobular breathing, the air is taken without much effort to the different lobes. They are often flushed and nourished while the blood stream is purified by the high assimilation of oxygen. Moreover, the prana goes to the lower, middle and upper parts of the body through the pranic channels whenever such breathing is done.