According to Theosphy the soul is a formless bubble of energy which contains our consciousness, and all our memories of past lives. It is God within God separated from the God mind by the energy bubble which is called the causal body. But since we cannot function in a formless body we have several lower bodies that we inhabit that are called the mental and the astral and the physical body. There is an interpenetrating shell between the higher bodies and the physical, and it is called the etheric body. Conciousness is channeled down into the brain through energy centers in the etheric body called chakras. We may be able to astral travel while still alive. That is leave the body for a time but still be connected to it, which may explain NDE. After we die we go to higher planes, and reside in the one our spiritual evolution equips us for. We stay in the spirit world until deciding it is necessary to reincarnate.