Table 1.
The chronological order of the ossification centers onset in the vertebrae
| Order of vertebra | Anatomical order | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | IP (%) | Rank of ossification events |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Cervical 1 | * | x | 62.00% | 2 | |||||||||
| 2 | Cervical 2 | x | #* | 62.00% | 2 | |||||||||
| 3 | Cervical 3 | x | # | * | 62.00% | 2 | ||||||||
| 4 | Cervical 4 | x | # | * | 62.00% | 2 | ||||||||
| 5 | Cervical 5 | x | # | * | 62.00% | 2 | ||||||||
| 6 | Cervical 6 | x | #* | 56.00% | 1 | |||||||||
| 7 | Cervical 7 | x | #* | 56.00% | 1 | |||||||||
| 8 | Cervical 8 | x | #* | 56.00% | 1 | |||||||||
| 9 | Cervical 9 | x | #* | 56.00% | 1 | |||||||||
| 10 | Cervical 10 | x | # | * | 62.00% | 2 | ||||||||
| 11 | Cervical 11 | x | # | * | 62.00% | 2 | ||||||||
| 12 | Cervical 12 | x | # | * | 62.00% | 2 | ||||||||
| 13 | Cervical 13 | x | # | * | 62.00% | 2 | ||||||||
| 14 | Cervical 14 | x | # | * | 62.00% | 2 | ||||||||
| 15 | Cervical 15 | x | # | * | 62.00% | 2 | ||||||||
| 16 | Thoracic 1 | x | #* | 69.00% | 3 | |||||||||
| 17 | Thoracic 2 | x | # | * | 69.00% | 3 | ||||||||
| 18 | Thoracic 3 | x | # | # | * | 62.00% | 2 | |||||||
| 19 | Thoracic 4 | x | # | * | 69.00% | 3 | ||||||||
| 20 | Thoracic 5 | x | # | * | 69.00% | 3 | ||||||||
| 21 | Thoracic 6 | x | # | * | 69.00% | 3 | ||||||||
| 22 | Synsacral 1 | x | #* | 69.00% | 3 | |||||||||
| 23 | Synsacral 2 | x | #* | 69.00% | 3 | |||||||||
| 24 | Synsacral 3 | x | #* | 69.00% | 3 | |||||||||
| 25 | Synsacral 4 | x | # | * | 69.00% | 3 | ||||||||
| 26 | Synsacral 5 | x | # | * | 69.00% | 3 | ||||||||
| 27 | Synsacral 6 | x | # | * | 69.00% | 3 | ||||||||
| 28 | Synsacral 7 | x | # | * | 69.00% | 3 | ||||||||
| 29 | Synsacral 8 | x# | * | 81.00% | 4 | |||||||||
| 30 | Synsacral 9 | x# | * | 81.00% | 4 | |||||||||
| 31 | Synsacral 10 | x# | * | 81.00% | 4 | |||||||||
| 32 | Synsacral 11 | x# | * | 81.00% | 4 | |||||||||
| 33 | Synsacral 12 | x# | * | 81.00% | 4 | |||||||||
| 34 | Caudal 1 | x*# | 88.00% | 5 | ||||||||||
| 35 | Caudal 2 | x*# | 88.00% | 5 | ||||||||||
| 36 | Caudal 3 | x*# | 88.00% | 5 | ||||||||||
| 37 | Caudal 4 | x*# | 88.00% | 5 | ||||||||||
| 38 | Caudal 5 | x*# | 88.00% | 5 | ||||||||||
| 39 | Caudal 6 | x*# | 88.00% | 5 | ||||||||||
| 40 | Pygostylous 1 | x# | 94.00% | 6 | ||||||||||
| 41 | Pygostylous 2 | x# | 94.00% | 6 | ||||||||||
| 42 | Pygostylous 3 | x# | 94.00% | 6 | ||||||||||
| 43 | Pygostylous 4 | x# | 94.00% | 6 |
IP: Incubation period; x: Perichondral ossification of the vertebral body;*: Perichondral ossification of the vertebral arch; and #: Endochondral ossification.