Which nerve is responsible for supplying the diaphragm?

The phrenic nerve is the primary nerve responsible for supplying the diaphragm, which is the main muscle involved in respiration. This nerve originates from the cervical spinal nerves C3, C4, and C5 and travels down to innervate the diaphragm. Its role is crucial because, during inhalation, the diaphragm contracts and moves downward, increasing the volume of the thoracic cavity, which allows air to flow into the lungs.

Given the function of the diaphragm, it is essential for effective breathing, making the phrenic nerve an integral part of the respiratory system. Damage to this nerve can significantly impair respiratory function, highlighting its importance in maintaining life-sustaining processes. Other nerves mentioned do not directly innervate the diaphragm and are involved in different functions in the body.