Spry Juncture, LLC
How to Evolve Gracefully
Posterior Scalenes
Region
Origin & Insertion
['Origin: Transverse processes of C4–C6', 'Insertion: External border of 2nd rib']
Synergistic Muscles
['Anterior and Middle Scalenes']
Joints
['Cervical vertebrae']
Primary Actions
['Elevates 2nd rib', 'Lateral flexion of neck']
Nerve & Spinal Segment
Cervical spinal nerves C6–C8
Cervical and brachial plexus
Interesting
Smallest scalene; often missed in assessments. [Netter’s]
Reversal of Action
Lift rib cage during breath work
Common Dysfunctions
Elevated first rib, rib dysfunction, radicular arm pain
How to Stretch
Tilt head away with opposite arm down.
Trigger Points
How to Strengthen
Lateral resistance neck band work.
Concentric Action
Laterally flex neck, slight rotation
Applications:
Tension relief improves breathing and neck alignment
Eccentric Action
Control return from lateral flexion
Isotonic Action
Manual resistance lateral flexion
Related Conditions
['TOS', 'Respiratory accessory use']
Isometric Action
Hold slight side bend with neck rotation
Exercise Ideas
['Resisted side bends', 'Postural rib glides', 'Breath with resistance']