The scalene muscles are a critical yet often overlooked group of muscles located in the lateral aspect of the neck. These three paired muscles—the anterior, middle, and posterior scalene—form part of the floor of the posterior triangle of the neck. Scalene are one of the most heavily utilised muscle groups. They play an essential role in both neck movement and respiration. When the scalene are healthy and working in a balanced way, they help support the upright posture of