What is the primary role of the scalene muscles in respiration?

The primary role of the scalene muscles in respiration is to assist in elevating the ribs during inhalation. These muscles, located in the lateral aspect of the neck, play a critical role in improving the expansion of the thoracic cavity by raising the first and second ribs when contracted. This elevation contributes to the process of inhalation by increasing the volume of the thoracic cavity, which ultimately helps lower the pressure within it, enabling air to flow into the lungs.

By facilitating this rib movement, the scalene muscles enhance lung capacity and efficiency of breathing, particularly during deep or forced inhalation. Understanding this function is important for grasping how different muscle groups contribute to the complex mechanics involved in respiratory physiology.