The pericardiacophrenic vessels accompany the phrenic nerve in the thorax.
The pericardiacophrenic artery is a long slender branch of the internal thoracic artery. It accompanies the phrenic nerve, between the pleura and pericardium, to the diaphragm, to which it is distributed. It anastomoses with the musculophrenic and inferior phrenic arteries.
The pericardiacophrenic vein drains into the internal thoracic vein.