Scalenus posterior (left) (Musculus scalenus posterior)
Educational content only — not medical advice.
Anatomy
The smallest and deepest scalene, from the lower cervical vertebrae to the second rib — more a secondary respiratory assistant than a prime mover.
Origin & insertion
Posterior tubercles of the transverse processes of C4–C6.
Action
Elevates the second rib and assists upper-thorax expansion.
Innervation
Anterior rami of the lower cervical nerves (C6–C8).
Clinical notes
Rarely discussed apart from the scalene group, but neck surgeons encounter it in deep posterior brachial-plexus approaches.
Related structures
Educational references
FAQ
What is the role of the Scalenus posterior (left)?
The smallest and deepest scalene, from the lower cervical vertebrae to the second rib — more a secondary respiratory assistant than a prime mover.
Why is the Scalenus posterior (left) clinically important?
Rarely discussed apart from the scalene group, but neck surgeons encounter it in deep posterior brachial-plexus approaches.
Source & license
BodyParts3D, © The Database Center for Life Science licensed under CC Attribution 4.0 International (https://creativecommons.org/licenses/by/4.0/). license details