Chakras are in the Linga Sarira (astral body). Linga Sarira is of 17 Tattvas, viz., 5 Jnanendriyas (ears, skin, eyes, tongue and nose); 5 Karmendriyas (speech, hands, legs, genitals, anus); 5 Pranas (Prana, Apana, Vyana, Udana, Samana); Manas (mind); and Buddhi (intellect).
These have corresponding centres in the spinal cord and the nerve-plexuses in the gross body. Each Chakra has control and function over a particular centre in gross body. These cannot be seen by the naked eyes. Some foolish doctors search for the Chakras in the physical body. They cannot find them there. Since they cannot find any Chakra in a dead body, they lose faith in Shastras and Yogic Kriyas.
Sukshma Prana moves in the nervous system of the Linga Sarira (astral body). Sthula Prana moves in the nervous system of the gross physical body. The two courses are intimately connected. They act and react upon each other. The Chakras are in the astral body even after the disintegration of the physical organism to death.
According to a school of thought, the Chakras are formed during concentration and meditation only. This is not possible. The Chakras should exist there in a subtle state, as the gross matter is the result of the subtle matter. Without the subtle body, the gross body is impossible. The meaning of this sentence should be taken to be that one can feel and understand the Sukshma Chakras during concentration and meditation only.
