How Many Phrenic Nerves Are There?

There are two phrenic nerves, a left and a right one. Image 1: The Phrenic nerve, showing course to diaphragm. Sensory fibers to the fibrous pericardium, mediastinal pleura, and diaphragmatic peritoneum.

Are there two phrenic nerves?

In humans, the right and left phrenic nerves are primarily supplied by the C4 spinal nerve, but there is also contribution from the C3 and C5 spinal nerves. From its origin in the neck, the nerve travels downward into the chest to pass between the heart and lungs towards the diaphragm.

What are the branches of phrenic nerve?

Within the abdominal cavity both the left and right phrenic nerves divide into three main branches - anterior, lateral and posterior. These course peripherally in a radial pattern.