splenius

Either of two muscles of the back of the neck, extending from the upper vertebrae to the base of the skull, that rotate and extend the head and neck.

A broad muscle, extending from the upper part of the thorax, on the back and side of the neck, beneath the trapezius.

A flat muscle of the back of the neck.

A broad muscle running up the top part of the back of the neck.

either of two flat muscles that extend from the upper vertebrae to the base of the skull and serve to rotate or flex or extend the head and neck