In one embodiment, the present disclosure relates to a retractor apparatus that includes a retractor frame (100, 800, 1300, 1400, 1500, 1600, 1700, 2800, 2900, 3000, 3100), five arms (121A-E) attached to the retractor frame and five rods (151A-E) each attached to one of the five arms. Each rod includes a convex surface facing a center of the retractor frame. At least two of the five rods are movable independently from one another. A first rod of the five rods includes a longitudinal axis and is translatable along the longitudinal axis. Further, the first rod is attached to a first arm of the five arms and is pivotable relative to the first arm. The axis of pivot is offset from the longitudinal axis through which the first rod translates.
