Si3 - Key point on the Governing Vessel, which follows the pine Located just after the metacarpal/phalanx joint, opposite the crease formed when the hand is closed. This point boosts the Small intestine meridian during its season - summer and disperses it in winter. In all seasons, it can treat the following disorders Backache along the spine (-). Torticollis (-). To recover after an effort (+). To treat eye disorders and ear troubles, when combined with points San Jiao 5/Te5 and Gb41 (-).