The average person has three unconscious and little developed higher bodies: etheric body (prana, chi), astral body, mental body, and possibly even a causal body (corresponding to the buddhic plane).
Esoteric magic knows only 4 bodies. Spirituality develops still higher bodies parallel to the Jivatma with diiferent symboliysm.
The student on the path develops higher spiritual bodies which enable the final enlightenment (Moksha). Then the spiritual Jivatma unites with the Paramata-Purusha (or the Dharmakaya).
In the secret iconography of the mysteries were therefore symbolic persons developed.
Mahayana - Buddhism and Vajrayana develop mainly the three spiritual Trikaya - bodies. Previous meditations serve the preparation and purification.
This sadhana also includes the Tsa Lung Tigle - exercises. The Blue Beryl of tibetan medicine contains drawings of Nadis and chakras.
The Laya Yoga of Yogi Bhajan describes 10 bodies : The material body, three mental bodies and six energy bodies. An eleventh body contains the divine tone (Shabda) and is in a state of nondual consciousness .
Chakras('whirls of energy') are parts of these higher bodies. The are connected across energy-channels or Nadis.
There are up to 32 chakras mentioned in the Yogabooks. In indian Tantra as in the Shat Chakra Nirupana (Sans. Ṭaṭcakranirūpaṇa) at least seven main chakras are mentioned as well as a series of secondary chakras. Goraksanath mentions other chakras distributed in the body.
According to Satguru Sivaya Subramuniyaswami, there are seven other underworld chakras under the Muladhara-Chakra.
* Exploring Auras: Cleansing and Strengthening Your Energy Field, Susan G. Shumsky