Clavicular breathing is the final stage of total ribcage expansion. It occurs after the thoracic inhalation has been completed. In order to absorb a little more air into the lungs, the upper ribs and the collar bone are pulled upwards by the muscles of the neck, throat and sternum.
Pranayama is generally defined as breath control. Although this interpretation may seem correct in view of the practices involved, it does not convey the full meaning of the term. The word pranayama is comprised if two roots: prana and ayama. Prana stands for vital energy or life force.