What is the purpose of the external intercostal?

The external intercostal muscles are primarily responsible for facilitating inhalation by elevating the ribs and expanding the thoracic cavity. This action increases the volume of the chest and decreases internal pressure, allowing air to flow into the lungs. They play a crucial role in the mechanics of breathing, particularly during deep or forceful inhalation. Additionally, they help stabilize the ribcage during respiratory movements.