Fig. 4. Semischematic view of an horizontal anatomic section of a human orbit. 1 = Fascial sheath of the eyeball fuses with the bulbar conjunctiva before inserting near the corneal ring; 2 = anterior part of the fascial sheath of the orbit (Tenon’s capsule); 3 = sclera; 4 = medial rectus muscle with its sheath; 5 = episcleral space (note that this space surrounds the whole scleral portion of the eyeball); 6 = posterior part of the fascial sheath of the orbit (Tenon’s capsule); 7 = lateral rectus muscle with its sheath. Note the continuity between muscular sheaths and fascial sheath of the eyeball. Note the continuity with the subconjunctival space. Note that anteriorly, the fascial sheath of the orbit, which is not sealed, allows the excess amount of local anesthetic to flow into the lids.