Fig. 2.

Two slips (heads) of the accessory muscle fusing with the superior and inferior rectus muscles. Sagittal section of the specimen harvested from the right orbit. Lateral view. Thickening of both superior and inferior rectus muscles at the insertion point of the accessory muscle slips has been clearly visualized. Black asterisk marks the accessory muscle, black arrowhead marks the origin of the accessory muscle located at the common tendinous ring, II optic nerve, III oculomotor nerve, IR inferior rectus muscle, SR superior rectus muscle, OA ophthalmic artery