The Understanding, is the nave of that wheel. The body with the senses, forms its spokes. The perceptions and acts are its circumference. Urged by on the quality of Darkness, the Soul presides over it.
अव्यक्तनाभं व्यक्तारं विकारपरिमण्डलम्। श्रेत्रज्ञाधिष्ठितं चक्रं स्निग्धाक्षं वर्तते ध्रुवम्॥