4 Endoscopic Dacryocystorhinostomy Farhad

Many accessory lacrimal glands can be found along the inner surface of the eyelids. A variable number of thin-walled excretory ducts, blood vessels, lymphatics, and nerves pass from the main orbital gland into these accessory lacrimal glands. The ducts continue downward, and about 12 of them empty into the conjunctival fornix approximately 5 mm above the superior margin of the upper tarsus. Because the lacrimal excretory ducts pass through the palpebral portion of the gland, biopsy of the lacrimal gland is usually performed on the main part to avoid sacrificing the ducts1.