Zygomaticus minor

The zygomaticus minor (Latin: musculus zygomaticus minor) is a muscle of facial expression located superiorly and medially to the zygomaticus major. It is classified as the buccolabial facial muscle. The zygomaticus minor belongs to the elevators of the lips.

Zygomaticus minor, Facial muscles, Muscles of facial expression, Head muscles
Zygomaticus minor by Anatomy Next
Zygomaticus minor
OriginLateral surface of the zygomatic bone
InsertionSkin and muscles of the lateral aspect of the upper lip 
ActionPulls the upper lip backward, upward and laterally, deepens and elevates the nasolabial sulcus
 Innervation Buccal branch of the facial nerve (CN VII)
Blood supplySuperior labial artery of the facial artery

 

Origin

The zygomaticus minor muscle originates from the lateral (facial) surface of the zygomatic bone. Its origin site is located superior and posterior to the zygomaticomaxillary suture.

 

Insertion

The zygomaticus minor inserts into the skin and muscles of the lateral aspect of the upper lip and blends with the fibers of the lip muscles, orbicularis oris and levator labii superioris muscles.

Origin and insertion of zygomaticus minor muscle
Origin and insertion of zygomaticus minor by Anatomy Next

 

Action

Upon activation, the zygomaticus minor pulls the upper lip backward, upward and laterally. This muscle also deepens and elevates the nasolabial sulcus.

Action of zygomaticus minor muscle
Action of zygomaticus minor by Anatomy Next

 

Innervation

The zygomaticus minor is innervated by the buccal branch of the facial nerve (CN VII).

 

Blood supply

Like the zygomaticus major muscle, the zygomaticus minor is also supplied by the superior labial branch of the facial artery.