Therefore, the first step in Kundalini Yoga is the purification of Nadis. A detailed knowledge of the Nadis and Chakras, is absolutely essential. Their location, functions, nature, etc., should be thoroughly studied.
The subtle lines, Yoga Nadis, have influence in the physical body. All the subtle (Sukshma) Prana, Nadis and Chakras have gross manifestation and operation in the physical body. The gross nerves and plexuses have close relationship with the subtle ones. You should understand this point well. Since the physical centres have close relationship with the astral centres, the vibrations that are produced in the physical centres by prescribed methods, have the desired effects in the astral centres.
Whenever there is an interlacing of several nerves, arteries and veins, that centre is called “Plexus.” The physical material plexuses that are known to the Vaidya Shastra are:— Pampiniform, Cervical, Brachial, Coccygeal, Lumbar, Sacral, Cardiac, Esophageal, Hepatic Pharyngeal, Pulmonary, Ligual Prostatic Plexus, etc. Similarly there are plexuses or centres of vital forces in the Sukshma Nadis. They are known as ‘Padma’ (lotus) or Chakras. Detailed instructions on all these centres are given elsewhere.
All the Nadis spring from the Kanda. It is in the junction where the Sushumna Nadi is connected with the Muladhara Chakra. Some say, that this Kanda is 12 inches above the anus. Out of the innumerable Nadis 14 are said to be important.
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