This is a broad triangular-shaped muscle originating from the center of the back, extending from the lower thoracic spine to the base of the skull, inserting on the scapula and clavicle. Contraction of the lower fibers draws the scapula downward. Contraction of the upper fibers elevates and rotates the scapula upward. This action increases contact of the humeral head with the glenoid in overhead movements (such as full arm balance). Contraction of the middle fibers adducts the scapula, assisting the rhomboids to open the chest.
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A complete guide on Eastern practices of breathing, mental, psychic and spiritual development. The book teaches that Yoga is divided into several branches, ranging from that which teaches the control of the body, to that which teaches the attainment of the highest spiritual development.