Anatomy
In the upper eyelid it blends with the tendon of the Levator palpebræ superioris, and in the lower eyelid with the tarsal plate.
When the eyes are closed, the whole orbital opening is covered by the septum and tarsi. Medially it is thin, and, becoming separated from the medial palpebral ligament, attaches to the lacrimal bone at its posterior crest. The medial ligament and its much weaker lateral counterpart, attached to the septum and orbit, keep the lids stable as the eye moves.
The septum is perforated by the vessels and nerves which pass from the orbital cavity to the face and scalp.
Read more about this topic: Orbital Septum
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“Man is a shrewd inventor, and is ever taking the hint of a new machine from his own structure, adapting some secret of his own anatomy in iron, wood, and leather, to some required function in the work of the world.”
—Ralph Waldo Emerson (1803–1882)