the Serpent Power is aroused into activity, it is made to penetrate, one by one, the psychic-nerve centres, until, rising like mercury in a magic tube, it reaches the thousand-petalled lotus in the brain-centre.
Evans-Wentz provides the foundational technical description of kundalini as a sequential ascent through the chakras culminating in cranial illumination.
, The Tibetan Book of the Dead (Evans-Wentz Edition), 1927thesis