Table 2. Calculated total range of motion in degrees for dorsal flexion, ventral flexion, and lateral flexion in dependence of IVD length in the Cryptoclidus eurymerus neck based on specimen IPB R 324.
Total ROM was obtained by multiplying the ROM for the modeled motion segment in dorsal, ventral, and lateral direction with the number of 31 functional intervertebral joints (assuming that there were 32 cervical vertebrae and that the atlas and axis were fused, Andrews, 1910).
| IVD length | Dorsal ROM in MS | Total ROM dorsal | Ventral ROM in MS | Total ROM ventral | Lateral ROM in MS | Total ROM lateral (mean of L/R) |
|---|---|---|---|---|---|---|
| 1 mm | 1.53 | 47 | 1.44 | 45 | 1.16 | 35.8 |
| 2 mm | 3.22 | 100 | 3.0 | 94 | 1.75 | 54.3 |
| 3 mm | 4.9 | 152 | 4.6 | 143 | 2.09 | 64.9 |
Notes.
- MS
- motion segment
- L
- left
- R
- right
- ROM
- range of motion in degrees