These are the energy centers in the body that are related to the nerve plexus center, which govern the body functions. The seven main chakras are described as being aligned in an ascending column from the base of the spine to the top of the head. Each chakra is associated with a certain color, multiple specific functions, an aspect of consciousness, a classical element, and other distinguishing characteristics. The chakras are thought to vitalise the physical body and to be associated with interactions of both a physical and mental nature. They are considered loci of life energy, or prana, which is thought to flow among them along pathways called nadis.