[1] The pericardiacophrenic arteries travel through the thoracic cavity.

[2] The pericardiacophrenic artery accompanies the phrenic nerve between the pleura and pericardium, to the diaphragm.

[3] This is where both the artery and the phrenic nerve are distributed.

[4] It anastomoses with the musculophrenic, and superior phrenic arteries.

[5] This article incorporates text in the public domain from page 584 of the 20th edition of Gray's Anatomy (1918)