05/29/2026
The splenius capitis & splenius cervicis are part of the “posterior chain” of the neck. They help support posture, rotate the head, and extend the cervical spine.
- Splenius Capitis
Attaches from the lower half of the ligamentum nuchae + C7-T3/4 spinous processes into the mastoid process & lateral superior nuchal line of the skull.
Actions:
• Extends the head/neck bilaterally
• Rotates the head to the SAME side
• Assists side bending
- Splenius Cervicis
Attaches from T3-T6 spinous processes then transverse processes of C1-C3/4.
Actions:
• Cervical extension
• Same side rotation
• Same side lateral flexion
These muscles often become OVERWORKED when the deep neck flexors aren’t doing their job, when we live in forward head posture, mouth breathe, clench the jaw, elevate the ribs/chest to breathe, or constantly look down at phones/computers. They can also grip to create “stability” in hypermobile individuals or people lacking thoracic mobility.
They can become UNDERWORKED or lengthened when posture collapses forward for long periods, when the nervous system avoids loading the posterior chain, or when other muscles compensate for cervical movement.
Tightness in any area is multifactorial. It’s often can be connected to breathing mechanics, rib position, thoracic mobility, vision, jaw tension, and overall postural strategy.
Do you have tension here?
Let us help you!
Link in bio 🔗
