The orbital septum is a thin layer of connective tissue that separates the eyelid from the eye socket. Synonyms for this anatomical structure include palpebral fascia, orbital fascia, and tarsal plate. The palpebral fascia is the layer of connective tissue that lines the eyelid and attaches to the tarsal plate. It is responsible for maintaining the shape and position of the eyelid. The orbital fascia is the layer of connective tissue that lines the eye socket and separates it from the surrounding structures. The tarsal plate is a thin piece of cartilage that provides support to the eyelid and helps maintain its shape. Together, these structures work to protect the eye and maintain its proper position within the eye socket.