Pascima means "west," the side of the setting sun. When the sun sets it grows dark, and we cannot see with our physical eyes. The word "tan," means intense stretch, however, its deeper meaning goes beyond our past self-imposed limitations. This pose is an intense stretch of the west or back side of the body which takes us beyond past boundaries. This pose awakens the back part of our brain, the cerebellum, which is said to be the seat of citta or the subconscious mind.
Seated forward bends bring us into very deep communion with the Divine. This pose symbolizes the coming together of the individual and the universal, closing the gap of separation of Oneness of the Atman and Brahman. This pose is a form of passive surrender. It is a surrender to Self or God.
Mary Jane Fengshui Yoga Girl: www.fengshuiyoganj.com