The lacrimal canaliculi are fine channels that carry tears from the puncta to the lacrimal sac. Each runs about 2 mm vertically and then about 8 mm horizontally along the lid margin. The upper and lower canaliculi usually join into a common canaliculus before entering the sac.
| Location | Within the medial parts of the upper and lower eyelids, from the puncta to the lacrimal sac |
|---|---|
| Parts |
|
| Nerve Supply | Infratrochlear nerve (CN V1) |
| Blood Supply | Medial palpebral arteries |
Conduct tears from the puncta into the lacrimal sac, aided by the blinking pump.
Lid lacerations near the inner corner often cut a canaliculus, which should be repaired with a stent to prevent permanent watering. Canaliculitis, often caused by Actinomyces, causes a swollen, pouting punctum with gritty discharge. Contraction of the lacrimal part of orbicularis oculi during blinking helps pump tears through the canaliculi.
A tear through a canaliculus, often from dog bites or blunt trauma to the medial lid. Prompt repair over a silicone stent preserves drainage.
Chronic infection within a canaliculus causing a red, swollen punctum and discharge, often with stone-like concretions.
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