Zygomaticus minor muscle

Structure

The zygomaticus minor muscle passes inferomedially from its origin to its insertion at an angle of approximately 30°. It has a mean width of around 0.5 cm.

Origin

It originates from the lateral aspect of just posterior to the zygomaticomaxillary suture.

Insertion

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

Innervation

The zygomaticus minor muscle receives motor innervation from the zygomatic branches and buccal branches of the facial nerve (CN VII).

Relations

The zygomaticus minor lies lateral to the rest of levator labii superioris muscle, and medial to its stronger synergist zygomaticus major muscle.

Variation

The zygomaticus minor muscle may have either a straight or a curved course along its length. It may attach to both the upper lip and the lateral alar region. It may be underdeveloped in some people, with its role taken over by nearby synergists. These synergists rarely change shape or position, but any difference in smile is usually imperceptible.

Function

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

History

The zygomaticus minor muscle is sometimes referred to as the "zygomatic head" of the levator labii superioris muscle.

Additional images

File:Zygomaticus minor muscle animation small.gif|Zygomaticus minor muscle (shown in red).

References

References

1. Standring, Susan. (2020). "Gray's Anatomy: The Anatomical Basis of Clinical Practice". Elsevier.
2. (August 2018). "Relational Anatomy of the Mimetic Muscles and Its Implications on Free Functional Muscle Inset in Facial Reanimation". [[Annals of Plastic Surgery]].
3. (August 2014). "Clinical Anatomic Considerations of the Zygomaticus Minor Muscle Based on the Morphology and Insertion Pattern". Dermatologic Surgery.
4. Eliot Goldfinger Artist/Anatomist. (7 November 1991). "Human Anatomy for Artists : The Elements of Form: The Elements of Form". Oxford University Press.