 The "pneuma", inhaled from the outside air, rushes through the arteries till it reaches the various centres, especially the brain and the heart, and there causes thought and organic movement.The "connate pneuma" of Aristotle is the warm mobile "air" that in the sperm transmits the capacity for locomotion and certain sensations to the offspring.These movements derive from the soul of the parent and are embodied by the "pneuma" as a material substance in semen.