cervical vertebra

https://doi.org/10.1351/goldbook.11673
Any of seven vertebrae that provide strength and structure to the cervical spine and support the head, allowing for its rotation and flexion.
Source:
PAC, 2015, 87, 841. (IUPAC Glossary of terms used in neurotoxicology (IUPAC Recommendations 2015)) on page 856 [Terms] [Paper]