Ouspensky related the inner six-line figure of the Food Diagram enneagram to the circulation of the blood. Point 1 , he wrote, represented the digestive system, point 2 the blood stream  , point 4 the breathing system, point 5 the brain, point 7 the spinal cord and point 8 the sympathetic nervous system and sex organs , and the lines "showed the direction of the flow or distribution of arterial blood in the organism and then its return in the form of venous blood  " ISOTM 1950, page 378
Ouspensky related the inner six-line figure of the Food Diagram enneagram to the circulation of the blood. Point 1 in his account representing the digestive system, point 2 the blood stream /heart , point 4 the breathing system, point 5 the brain, point 7 the spinal cord and point 8 the sympathetic nervous system and sex organs . He wrote that the inner lines "showed the direction of the flow or distribution of arterial blood in the organism and then its return in the form of venous blood . It was particularly interesting that the point of return was not the heart but the digestive system which indeed is the case since venous blood is first of all mixed with the products of digestion, it then goes to the right auricle, through the right ventricle, then to the lungs to absorb oxygen, and from there goes to the left auricle and then the left ventricle and then through the aorta into the arterial system " ISOTM 1950, page 378
R
, he wrote, represented
in his account representing
A
/heart
R
, and the
. He wrote that the inner
A
. It was particularly interesting that the point of return was not the heart but the digestive system which indeed is the case since venous blood is first of all mixed with the products of digestion, it then goes to the right auricle, through the right ventricle, then to the lungs to absorb oxygen, and from there goes to the left auricle and then the left ventricle and then through the aorta into the arterial system