pericardiacophrenic veins pericardiacophrenic veins pericardiacophrenic veins are the vena comitans of the pericardiacophrenic arteries. pericardiacophrenic vessels accompany the phrenic nerve in the middle mediastinum of the thorax. the vein drains into the internal thoracic vein, or brachiocephalic vein. veins of the thorax and vertebral columnthoraxheartcoronary sinus great cardiac (left marginal) posterior of the left ventricle oblique of the left atrium (ligament of the left vena cava) middle cardiac small cardiac vein anterior cardiac (right marginal) lungs pulmonary veins superiorvena cavabrachiocephalic internal thoracic anterior intercostal superior epigastric left superior intercostal supreme vertebral subclavian axillary: lateral thoracic thoracoepigastric dorsal scapular external jugular pericardiacophrenic internal jugular azygos right superior intercostal bronchial intercostal/posterior intercostal 5-11 accessory hemiazygos/hemiazygos superior phrenic vertebral column vertebral venous plexuses external internal spinal posterior anterior basivertebral intervertebral pericardiacophrenic veinsthe thoracic aorta, viewed from the left side. (pericardiacophrenic veins not labeled, but pericardiacophrenic artery labeled at center left.)detailsdrains tobrachiocephalic veinarterypericardiacophrenic arteryidentifierslatinvenae pericardiacophrenicaeta98a12.3.04.007ta24775fma70830anatomical terminology