Suṣumnā is the chief of the subtle channels, running along the spine from its base to the crown. In ordinary life energy flows in the side channels; when it enters the suṣumnā, the yoga texts say, the mind becomes still and kuṇḍalinī can rise.
Suṣumnā
The central channel of the subtle body, through which kuṇḍalinī rises.
Also: Sushumna