The lacrimal part (Horner's muscle) wraps around the lacrimal canaliculi and sac, creating a pumping action during blinking that propels tears through the nasolacrimal drainage system.
| Origin | Posterior lacrimal crest of the lacrimal bone |
|---|---|
| Insertion | Lateral raphe of the eyelid |
| Nerve Supply | Facial nerve — zygomatic branch (VII) |
| Blood Supply | Ophthalmic artery |
| Actions | Dilates the lacrimal sac during blinking — creates a pumping action for tear drainage; Assists eyelid closure |
|---|
Lacrimal part dysfunction in facial nerve palsy impairs the lacrimal pump, contributing to epiphora despite a structurally intact nasolacrimal system. In DCR, this component must be preserved to maintain the pumping mechanism.
Not directly palpable — identified by its function during blinking assessment.
Epiphora from lacrimal pump failure due to orbicularis lacrimal part paresis in Bell's palsy.
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