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 |
|
|---|
It draws the eyelids and lacrimal canaliculi medially and helps pump tears into the lacrimal sac.
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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