Medial canthal tendon branches out.

A previously undescribed, superior supporting branch of the medial canthal tendon has been found by careful cadaver dissection. This branch unites the common tendon to the frontal bone; thus, it provides a superior support to the medial canthus. The posterior portion of the medial canthal tendon is a thin and weak structure, as compared with its anterior companion. It inserts on the posterior lacrimal crest. While most surgeons contend that the posterior limb of the medial canthal tendon maintains the position of the medial canthus after either accidental or surgical disinsertion of the anterior tendon, it is likely that this superior supporting branch maintains the canthal position in these clinical conditions.