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The position of the hyoid bone
| Horizontal position |
| HC3: The distance from the anterior upper point of the hyoid bone (H) to the lower edge of the third cervical vertebra (C3) |
| HPtm: The distance from H to the vertical line of the FH through the Ptm point |
| Vertical position |
| HFH: The distance from H to the FH plane |
| HMP: The distance from H to the MP plane (Go-Gn) |
