middle of the 3 nadis (+ Ida,+ Pingala) along the spine
This nadi connects the base chakra to the crown chakra.
Medullar Shushumna interpenetrates the cerebrospinal axis from the perineum to the juncture of the lamboid and sagittal suture of the cranium.
It is one of the three major nerves transporting vital energy that plays a major role in attaining Supreme Bliss.