Pasupata Toga1 - Verse 27-23

The wind shall be retained gradually in the umbilicus, in the heart, in the chest, in the throat, in the mouth, at the tip of the nose, in the eye, between the eyebrows and in the head. The retention of the breath a little above in the great lord is called Dhararid. Since both the Prana and Apdna are obstructed, it is called Pranayama.