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Canalicular Laceration

Background

Lacerations of the canalicular system often occur in the setting of trauma.
The canaliculi are the mucosal ducts through which tears drain from the eye.
The canalicular portion of the tear drainage system is in the medial aspect of the lid. The lacrimal drainage apparatus consists of the puncta on the upper lid and the lower lid, the canaliculi, the common canaliculus, the lacrimal sac, and the nasolacrimal duct.

Each eyelid margin can be divided into the larger palpebral portion (consisting of skin, orbicularis muscle, insertion of lid retractors, tarsal plate, and conjunctiva) and the smaller lacrimal portion (consisting of skin, orbicularis, canaliculi, and conjunctiva).
The palpebral potion of the lid is lined with lashes; posterior to the lashes are the openings of the meibomian glands of the tarsal plate. The palpebral margin assumes a flat contour. The lacrimal portion of the lid is round and without lashes. Injuries to the canalicular portion of the tear drainage system can occur as isolated injuries or as one component of more extensive injuries, including multiple marginal lid lacerations, orbital fractures, and globe injuries.

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