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. 2021 Nov 11;47(1):3–59. doi: 10.1136/rapm-2021-103031

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© American Society of Regional Anesthesia & Pain Medicine 2022. Re-use permitted under CC BY-NC. No commercial re-use. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, an indication of whether changes were made, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Ultrasound image demonstrating an artery running across a cervical facet articular pillar. AP, articular pillar; at, anterior tubercle of the transverse process; pt, posterior tubercle of the transverse process.