Horner's muscle is the palpebral part of the orbicularis oculi muscle.
Detailed Explanation of Horner's Muscle
Horner's muscle plays a key role in eyelid function. Here's a more detailed look:
- Anatomical Origin: According to provided information, Horner's muscle has a fan-shaped origin in the lacrimal bone.
- Fiber Orientation: Its muscle fibers are oriented from 160 to 210 degrees relative to the ear-eye plane.
- Convergence: These fibers converge towards the medial palpebral commissure, the point where the upper and lower eyelids meet near the nose.
Function
While the reference doesn't explicitly state the function, we can infer that because it's part of the orbicularis oculi, it contributes to:
- Eyelid closure (gentle closure).
- Assisting in tear drainage.
