Chitra is the highest and most beloved of the Yogins. It is like a thin thread of lotus. Brilliant with five colours, it is in the centre of Sushumna. It is the most vital part of the body. This is called the Heavenly way. It is the giver of Immortality. By contemplating on the Chakras that exist in this Nadi, the Yogi destroys all sins and attains the Highest Bliss. It is the giver of Moksha.
When the breath flows through Sushumna, the mind becomes steady. This steadiness of the mind is termed “Unmani Avastha”, the highest state of Yoga. If you sit for meditation when Sushumna is operating, you will have wonderful meditation. When the Nadis are full of impurities, the breath cannot pass into the middle Nadi. So one should practise Pranayama for the purification of Nadis.
Para-Sympathetic And Sympathetic System
On either side of the spinal cord run the sympathetic and para-sympathetic cords, a double chain of ganglia. Ganglia means a collection of nerve-cells. These constitute the Autonomic System which supplies nerves to the involuntary organs, such as heart, lungs, intestines, kidneys, liver, etc., and controls them. Vagus nerve which plays a vital part in human economy comes out of this sympathetic system. Sympathetic system stimulates or accelerates. Para-sympathetic system retards or inhibits.
There are nerves to dilate or expand the arteries which carry pure oxygenated blood to nourish the tissues, organs and cells of different parts of the body. These are called Vaso-dilators. The left and the right sympathetic chains are connected by filaments. These cross from the right to the left side and vice versa, but the exact places where these crosses are not known, though several have attempted to find. M’Kendrick and Snodgrass in their Physiology of the Senses write: “Where the sensory fibres cross from one side to the other is not known ..... In some parts of the spinal cord the sensory fibres do cross from the right to left side and vice versa.”
