Corpus: Zygomaticus minor muscle
from Greek: zygon - yoke, fork
1. Definition
The zygomaticus minor muscle is a superficial muscle located in the cheek area that functions to lift the upper lip. It is part of the mimic musculature.
2. Nomenclature
The nomenclature for the mimic musculature is not standardized in anatomical literature. The zygomaticus minor muscle is sometimes referred to as the zygomatic head of the levator labii superioris muscle.
3. Course
The zygomaticus minor muscle originates from the zygomatic bone, specifically just in front of the zygomaticomaxillary suture. Its fibers extend medially and downward to insert into the upper lip.
4. Innervation
The zygomaticus minor muscle is innervated by the zygomatic branches of the facial nerve (cranial nerve VII).
5. Function
The primary function of the zygomaticus minor muscle is to lift the upper lip. It works in the same direction as the levator labii superioris alaeque nasi muscle, but with a more lateral pull. The muscle is closely attached to the underlying skin, causing the skin to move with the muscle during facial expressions.