In Yoga and Tantra, the word nadi appears frequently. It is usually translated as “channel.”
But a nadi is not a blood vessel or a nerve that can be seen on an anatomical diagram.
What Are Nadis?
In traditional models, nadis are channels of the subtle body through which prana is believed to move.
Put simply, they are part of a symbolic map of the inner body.
Different texts describe different numbers of nadis — sometimes tens of thousands. But three became especially important:
– Ida – Pingala – Sushumna
What Does a Practitioner Actually Do?
During pranayama and certain Tantric practices, a person works with breathing and attention as though prana were moving through these channels.
For example, the practitioner may visualize a flow moving through the left and right channels and then entering the central channel — Sushumna.
The purpose was not to “clean out physical tubes.”
The idea was to organize attention, breathing, and internal visualization into one coherent system.
Can Nadis Be Described as Nerves?
No.
Modern authors sometimes try to directly identify Ida and Pingala with parts of the nervous system and Sushumna with the spinal cord. These comparisons may be useful as analogies, but historical texts did not describe nadis as anatomical structures in the modern scientific sense.
Nadis are elements of a traditional yogic model of the body, not scientifically established physical channels within the human organism.