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The Origin and the Instrument of Animal Motion – De Motu Animalium Chapters 9 and 10.

This chapter is a commentary on Aristotle's "De motu animalium", Chapters 9 and 10. In Chapter 9 Aristotle provides arguments for the view that the unmoved cause of animal's self-motion is located in the centre of the body, that is in the heart. In Chapter 10 he explains the mechanism of self-motion, starting with the first moved mover, that is the pneuma. I argue that, according to Aristotle, perceptions and thoughts, if certain conditions are satisfied, cause tiny heatings and chillings in the heart, and pneuma reacts to these thermic alterations by expanding and contracting, thus producing the mechanical impulse. The impulse moves the tiny tendons in the heart, which bring about - through a series of intermediates that exploit the principle of lever - motion of the limbs that enable the animal to move from one place to another.

soul, pneuma, heart, locomotion, desire, phantasia, hylomorphism

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