Splenius capitis muscle :-
Muscle details :-
a broad, straplike muscle in the back of the neck. It pulls on the base of the skull from the vertebrae in the neck and upper thorax. It is involved in movements such as shaking the head.
Nuchal ligament and spinous process of C7-T3 .
Mastoid process of temporal and occipital bone .
Posterior ramus of spinal nerves C3 and C4 .
Extend, rotate, and laterally flex the head .