Vayu, or air, on entering the body divide into the pancha vayu, Prana, the life force, Udana, the ascending vayu associated with the head and higher regions of the body, apana the descending, that expels wind, excrement, semen and urine, the samana, that kindles the bodily fire and effects circulation and the vyana, ensures diffusion and division, though some texts characterise it as an attractive force deriving from the Earth element. Together, these five principal vayu effect respiration, digestion, circulation and excretion, in short, the bodily processes. Prana, udana, apana, samana and vyana are also referred to as the Pancha Vayu, or the five air deities.
The Prana Maya Kosha is hence not corporeal, composed as it is of vayu, or the element of air, and refers more to bodily processes than the physical body as such.
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