Nadis: Yoga Nadis

By Sri Swami Sivananda

Nadis are the astral tubes made up of astral matter that carry psychic currents. The Sanskrit term ‘Nadi’ comes from the root ‘Nad’ which means ‘motion’. It is through these Nadis (Sukshma, subtle passages), that the vital force or Pranic current moves or flows. Since they are made up of subtle matter they cannot be seen by the naked physical eyes and you cannot make any test-tube experiments in the physical plane. These Yoga Nadis are not the ordinary nerves, arteries and veins that are known to the Vaidya Shastra (Anatomy and Physiology). Yoga Nadis are quite different from these.

The body is filled with innumerable Nadis that cannot be counted. Different authors state the number of Nadis in different ways, i.e., from 72,000 to 3,50,000. When you turn your attention to the internal structure of the body, you are struck with awe and wonder. Because the architect is the Divine Lord Himself who is assisted by skilled engineers and masons—Maya, Prakriti, Visva Karma, etc.

Nadis play a vital part in this Yoga. Kundalini when awakened, will pass through Sushumna Nadi and this is possible only when the Nadis are pure. 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. They are:

Again Ida, Pingala and Sushumna are the most important of the above 14 Nadis, and Sushumna is the chief. It is the highest and most sought by the Yogins. Other Nadis are subordinate to this. Detailed instructions on each Nadi and its functions and the method of awakening the Kundalini and passing it from Chakra to Chakra are given in the following pages.

Spinal Column

Before proceeding to the study of Nadis and Chakras you will have to know something about the Spinal Column, as all the Chakras are connected with it.

Spinal Column is known as Meru Danda. This is the axis of the body just as Mount Meru is the axis of the earth. Hence the spine is called ‘Meru’. Spinal column is otherwise known as spine, axis-staff or vertebral column. Man is microcosm. (Pinda - Kshudra-Brahmanda). All things seen in the universe,—mountains, rivers, Bhutas, etc., exist in the body also. All the Tattvas and Lokas (worlds) are within the body.

The body may be divided into three main parts:—head, trunk and the limbs, and the centre of the body is between the head and the legs. The spinal column extends from the first vertebra, Atlas bone, to the end of the trunk.

The spine is formed of a series of 33 bones called vertebrae; according to the position these occupy, it is divided into five regions:—

1. Cervical region (neck) 7 vertebrae

2. Dorsal region (back) 12 vertebrae

3. Lumbar region (waist or loins) 5 vertebrae.

4. Sacral region (buttocks, Sacrum or gluteal) 5 vertebrae.

5. Coccygeal region (imperfect vertebrae Coccyx) 4 vertebrae.

Vertebrae

The vertebral bones are piled one upon the other thus forming a pillar for the support of the cranium and trunk. They are connected together by spinous, transverse and articular processes and by pads of fibro-cartilage between the bones. The arches of the vertebrae form a hollow cylinder or a bony covering or a passage for the spinal cord. The size of the vertebrae differs from each other. For example, the size of the vertebrae in cervical region is smaller than in dorsal but the arches are bigger. The body of the lumbar vertebrae is the largest and biggest. The whole spine is not like a stiff rod, but has curvatures that give a spring action. All the other bones of the body are connected with this spine.

Between each pair of vertebrae there are apertures through which the spinal nerves pass from the spinal cord to the different portions and organs of the body. The five regions of the spine correspond with the regions of the five Chakras: Muladhara, Svadhishthana, Manipura, Anahata and Vishuddha. Sushumna Nadi passes through the hollow cylindrical cavity of the vertebral column and Ida is on the left side and Pingala on the right side of the spine.