Lacrimal punctum of upper and lower eyelid is

Each lacrimal canaliculus begins at the lacrimal punctum and is 10 mm long.it has a veical pa which is 2mm long and a horizontal pa which is 8 mm long. There is a dilated ampulla at the bend,both canaliculi open close to the each other in the lateral wall of the lacrimal sac behind the medial palpebral ligament. ref.BDC volume 3;sixth edition pg 76