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'''Śiras''' (Head) is the region where all ‘Prānas’ ‘Prānas’ (most vital entities) are situated and all sensory and motor activities are controlled from. That is why ‘Head’ is called the ‘Most important organ’ among all parts of the body (Ca. Sū. 17/12). It is described that all sensory and motor organs along with their ‘Prāanavaha Srotāmsi’‘Prāanavaha Srotāmsi’, are connected to the brain in a fashion that is similar to the connections between the sunrays and the Sun. (Ca. Si. 9/4). Bhela has explained that the mind is situated in between the head and palate. The efficiency of mind is beyond any other sensory or motor organ (Bh.Ci. 8/2-3).

This is situated in head and is responsible for the control over intellectual functions, cardiovascular functions, sense organs, psychological activities, respiration, and reflex activities like sneezing, belching and deglutition (A.H.Sū. 12/5). Based on this sub-type of ‘Vāta’, ‘Prānavaha ‘Prānavaha Srotas’ has derived its name.