Splenius cervicis muscle
The splenius cervicis originates from the third, fourth, fifth, and sixth thoracic vertebrae in the back. It attaches to these vertebrae at the spinous processes and the supraspinous ligament above them.
The splenius cervicis is innervated by the posterior primary rami of C5 and C6.
The name splenius cervicis comes from splenius, Greek for bandage, and cervix, meaning neck.