Tenon’s capsule, a thin membranous socket that envelops the eyeball from the optic nerve to the ciliary region and allows it to move freely. Tenon’s capsule has a smooth inner surface, pierced by vessels and nerves, and fuses with the sheath of the optic nerve and with the sclera. The lower part of the membrane thickens into the suspensory ligament, which attaches to the zygomatic arch and the lacrimal bones. Also called fascia bulbi.
