action of splenius capitis
Unilateral: rotate and laterally flex neck Bilateral: extend neck
The splenius capitis is a muscle located in the back of the neck and upper back. Its main action is to rotate and extend the head and neck, as well as laterally flexing the head to the same side.
More specifically, the splenius capitis muscle works to:
1. Rotate the head – when both sides of the splenius capitis muscles contract, they rotate the head to the same side as the muscle.
2. Extend the head – when both sides of the splenius capitis muscles contract, they help to extend the head backwards.
3. Lateral flexion – when one side of the splenius capitis muscle contracts more than the other, it bends the head and neck to the same side as the muscle.
Overall, the splenius capitis muscle plays a crucial role in head and neck movement and is important in activities that involve turning or tilting the head such as when driving, reading or looking at a screen.
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