Spry Juncture, LLC
How to Evolve Gracefully
Multifidi
Region
Origin & Insertion
['Origin: Sacrum, PSIS, mammillary/transverse processes', 'Insertion: Spinous processes 2–4 segments above']
Synergistic Muscles
['Rotatores', 'Erector spinae']
Joints
['Multiple spinal segments']
Primary Actions
['Spinal stability', 'Segmental extension', 'Contralateral rotation']
Nerve & Spinal Segment
Dorsal rami of spinal nerves
Segmental innervation; C4–L5
Interesting
Key postural stabilizer; often underactive. [Clinically Oriented Anatomy]
Reversal of Action
Anchor spine while pelvis shifts
Common Dysfunctions
Spinal instability, chronic low back pain, poor coordination
How to Stretch
Child’s pose with rotation.
Trigger Points
How to Strengthen
Pelvic tilts, bird-dog, TA activation.
Concentric Action
Extend and stabilize vertebral segments
Applications:
Key stabilizer in core rehab and low back pain management
Eccentric Action
Control spinal rotation or flexion
Isotonic Action
Bird dog or contralateral reach
Related Conditions
['Lumbar strain', 'Spondylolysis']
Isometric Action
Hold spinal neutral in quadruped or plank
Exercise Ideas
['Bird-dog', 'Quadruped lifts', 'Lumbar stabilization progressions']