The zygomaticus minor muscle is a muscle of facial expression. 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 | |
Structure
editThe zygomaticus minor muscle passes inferomedially from its origin to its insertion[1] at an angle of approximately 30°. It has a mean width of around 0.5 cm.[2]
Origin
editIt originates from the lateral aspect of just posterior to the zygomaticomaxillary suture.[1]
Insertion
editIt inserts into the muscular tissue of the upper lip, blending distally with levator labii superioris muscle.[1]
Innervation
editThe zygomaticus minor muscle receives motor innervation from the zygomatic branches and buccal branches of the facial nerve (CN VII).[1]
Relations
editThe zygomaticus minor lies lateral to the rest of levator labii superioris muscle, and medial to its stronger synergist zygomaticus major muscle.[2]
Variation
editThe zygomaticus minor muscle may have either a straight or a curved course along its length.[3] It may attach to both the upper lip and the lateral alar region.[3] It may be underdeveloped in some people, with its role taken over by nearby synergists.[2][3] These synergists rarely change shape or position, but any difference in smile is usually imperceptible.[2]
Function
editThe zygomaticus minor muscle draws the upper lip up, back, and out, such as during smiling.
History
editThe zygomaticus minor muscle is sometimes referred to as the "zygomatic head" of the levator labii superioris muscle.[4]
Additional images
edit-
Zygomaticus minor muscle (shown in red).
See also
editReferences
edit- ^ a b c d Standring, Susan (2020). Gray's Anatomy: The Anatomical Basis of Clinical Practice (42th ed.). New York: Elsevier. p. 624. ISBN 978-0-7020-7707-4. OCLC 1201341621.
- ^ a b c d Zabojova, Jorga; Thrikutam, Nikhitha; Tolley, Philip; Perez, Justin; Rozen, Shai M.; Rodriguez-Lorenzo, Andres (August 2018). "Relational Anatomy of the Mimetic Muscles and Its Implications on Free Functional Muscle Inset in Facial Reanimation". Annals of Plastic Surgery. 81 (2): 203–207. doi:10.1097/SAP.0000000000001507. ISSN 0148-7043. PMID 29846216. S2CID 44102758.
- ^ a b c Choi, Da-Yae; Hur, Mi-Sun; Youn, Kwan-Hyun; Kim, Jisoo; Kim, Hee-Jin; Kim, Sophie Soyeon (August 2014). "Clinical Anatomic Considerations of the Zygomaticus Minor Muscle Based on the Morphology and Insertion Pattern". Dermatologic Surgery. 40 (8): 858–863. doi:10.1111/dsu.0000000000000063 (inactive 1 November 2024). ISSN 1076-0512. PMID 25006853.
{{cite journal}}: CS1 maint: DOI inactive as of November 2024 (link) - ^ Eliot Goldfinger Artist/Anatomist (7 November 1991). Human Anatomy for Artists : The Elements of Form: The Elements of Form. Oxford University Press. p. 90. ISBN 978-0-19-976310-8.