The secret behind dimples is a variation in the cheek muscle. Specifically, cheek dimples are caused by the zygomaticus major muscle splitting in two.
The Zygomaticus Major and Dimple Formation
The key to understanding dimples lies in the zygomaticus major muscle, which is primarily responsible for facial expressions like smiling. Here’s how it works:
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Muscle Splitting: Before birth, this muscle can divide into two distinct bundles:
- A superior bundle positioned above the corner of the mouth.
- An inferior bundle positioned below the corner of the mouth.
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Dimple Creation: This splitting results in the creation of a small indentation or dimple in the cheek when the person smiles or makes certain facial expressions. Essentially, the split muscle pulls on the skin, creating the characteristic dimple.
Summary Table
| Feature | Description |
|---|---|
| Primary Muscle | Zygomaticus Major |
| Process | Muscle splits into two bundles |
| Bundle Locations | Superior (above mouth corner) and Inferior (below mouth corner) |
| Result | Indentation (dimple) appears when muscle contracts during facial expressions |
Additional Information
- Dimples are often considered an attractive facial feature, and their presence is thought to be primarily genetic.
- Not everyone has dimples as it depends on if the zygomaticus major muscle splits during fetal development.
In conclusion, the seemingly simple dimple is a result of a unique structural variation within the zygomaticus major muscle.
