FMF Angle
- Definition: Angle between the line along the upper surface of the maxilla and the line along the frontal bone.
- Normal range: ~76–83° at 11–13+6 weeks
- Purpose: Helps assess facial disproportions or micrognathia
- Increased FMF angle: Associated with Down syndrome (Trisomy 21)
- How to Measure:
- Use mid-sagittal view of the face
- Draw one line along the upper aspect of the maxilla
- Draw a second line tangential to the frontal bone
- Measure the angle between these two lines
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