What anatomical structure does the right phrenic nerve pass over before it reaches the diaphragm?

The right phrenic nerve passes over the subclavian vein before it reaches the diaphragm. This anatomical relationship is important as the right phrenic nerve originates from the cervical plexus, specifically from the C3 to C5 spinal nerves, and travels downwards. It courses along the surface of the right lung and then crosses over the subclavian vein in the neck region, making it crucial for any surgical procedures involving this area to consider the position of the nerve to prevent injury.

The right phrenic nerve’s function is to provide motor innervation to the diaphragm, enabling respiration. Understanding its pathway and the structures it encounters, including the subclavian vein, is vital in both clinical and anatomical studies, as it helps in localizing and diagnosing issues related to diaphragmatic dysfunction. The subclavian vein's location creates a significant landmark for the nerve and plays a role in various clinical considerations.