Spry Juncture, LLC
How to Evolve Gracefully
Splenius Capitis
Region
Origin & Insertion
['Origin: Nuchal ligament and spinous processes of C7–T3', 'Insertion: Mastoid process and lateral nuchal line']
Synergistic Muscles
['SCM', 'Semispinalis capitis']
Joints
['Cervical and upper thoracic vertebrae']
Primary Actions
['Head extension', 'Lateral flexion and rotation']
Nerve & Spinal Segment
Dorsal rami of middle cervical spinal nerves
No plexus; segmental cervical roots
Interesting
Key postural stabilizer. [Clinically Oriented Anatomy]
Reversal of Action
Pull thorax toward skull (postural cue)
Common Dysfunctions
Stiff neck, limited cervical extension
How to Stretch
Chin tuck with rotation away.
Trigger Points
How to Strengthen
Head extension against resistance.
Concentric Action
Extend, rotate, and laterally flex neck
Applications:
Improves postural endurance in prolonged seated positions
Eccentric Action
Control head return from extended or rotated position
Isotonic Action
Prone neck lifts
Related Conditions
['Cervicogenic headache', 'Facet lock']
Isometric Action
Hold neutral head position against gravity
Exercise Ideas
['Head lifts', 'Neck band extensions', 'Side flexion holds']