Table 1.

Hyoid landmarks and linear measurements defined (see Fig. 1).

#	Landmark	Abbreviation	Description
1.	Hyoidale	Hy	The most superior and anterior point in the sagittal midline of the hyoid body.
2.	Hyoid Body Posterior Superior	Hps	The most posterior and superior point in the sagittal midline of the hyoid body.
3.	Hyoid Body Anterior Inferior	Hai	The most inferior point in the sagittal midline of the hyoid body.
4.	Greater Cornu Base Left	GrCorBL	The base or most proximal point of left greater cornu (in individuals with fused hyoid bones, the midpoint of joint between body and cornu on anterior surface).
5.	Greater Cornu Apex Left	GrCorAL	The apex or most superior and distal endpoint of the left greater cornu.
6.	Greater Cornu Apex Right	GrCorAR	The apex or most superior and distal endpoint of the right greater cornu.
7.	Greater Cornu Width Midpoint	GrCorWM	The midpoint of the line extending from the apex of the left greater cornu to the apex of the right greater cornu (calculated using all three dimensions in Analyze 10.0).
	Linear Measurement	Landmarks	Description
2–3	Hyoid Body Depth	Hps-Hai	In the sagittal plane, distance from the most posterior and superior point of the hyoid body to the most inferior point of hyoid body.
5–4	Greater Cornu Length Left	GrCorAL- GrCorBL-	Distance from the apex (most superior and distal endpoint) of left greater cornu to the base (most proximal point) of left greater cornu.
5–1	Total Length Left	GrCorAL-Hy-	Distance from the apex of the left greater cornu to the most superior and anterior point of the hyoid body.
5–6	Greater Cornu Width	GrCorAL-GrCorAR	Distance from the apex of left greater cornu to the apex of right greater cornu.
1–7	Total Hyoid Length Left	Hy-GrCorWM	Distance from the most superior and anterior point in the sagittal midline of hyoid body to the midpoint of the line connecting the apex of the left greater cornu to the apex of the right greater cornu.