Zygomaticus Minor Muscle

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. It draws the upper lip backward, upward, and outward and is used in smiling. It is innervated by the facial nerve (VII).

Zygomaticus minor
Muscles of the head, face, and neck.
Details
Origin	zygomatic bone
Insertion	skin of the upper lip
Artery	facial artery
Nerve	buccal branch
Actions	elevates upper lip
Identifiers
Latin	musculus zygomaticus minor
TA98	A04.1.03.030
TA2	2080
FMA	46811
Anatomical terms of muscle [edit on Wikidata]

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.

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

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

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  Zygomaticus minor muscle (shown in red).

• Zygomaticus major muscle
• Zygomatic bone