Your patient has been referred for torticollis. On the initi…

Your patient has been referred for torticollis. On the initial evaluation you find the following passive ROM measurements: Right cervical rotation= 100 degrees, Left cervical rotation = 45 degrees, Right lateral flexion=25 degrees, Left lateral flexion= 50 degrees. Patient is able to track a visually stimulating toy to the right but exhibits difficulty to the left. What muscle is most likely affected?