In a highly simplified description, it may be said that the fifty letters or sounds of the Sanskrit alphabet are on the petals of the Sahasrara, and that each alphabetical vibration in turn is connected with a specific petal on the lotuses in the spinal centers (which have a total of fifty corresponding petals: Coccygeal, 4: Sacral, 6: Lumbar, 10: Dorsal, 12: Cervical, 16: and medullary-Christ center, 2). “Petals” means rays or vibrations. These vibrations, singularly and in combinations, and in conjuction with the five elements (tattvas) and other principles of nature, are responsible for various psychological and physiological activities in the physical and astral bodies of man. I include with this commentary (on page 1121) a chart authored by my Paramguru, Yogavatar Lahiri Mahasaya diagramming this concept as he perceived it. The illustration is a basic outline, for the total numbers of the nadis in the body are variously numbered by the scriptures to be as many as 72,000. During my visit to India in 1935, a copy of Lahiri Mahasaya’s chart was given to me by Ananda Mohan Lahiri, grandson of my Paramguru…“
Sri Sri Paramahansa Yogananda, Chapter 1, Bhagavad Gita: God Talks with Arjuna.
Source:Zack G Covell