It originates from the zygomatic bone, lateral to the rest of the levator labii superioris muscle, and inserts into the outer part of the upper lip.

The zygomaticus minor muscle passes inferomedially from its origin to its insertion[1] at an angle of approximately 30°.

[1] It inserts into the muscular tissue of the upper lip, blending distally with levator labii superioris muscle.

[2][3] These synergists rarely change shape or position, but any difference in smile is usually imperceptible.

[2] The zygomaticus minor muscle draws the upper lip up, back, and out, such as during smiling.