Keywords: T-4 / T-5 interganglion region, T-4 / T-5 intervertebral disc, anterior interventricular sulcus, aorta, apex of heart, caudal edge of right auricle, caudal edge of scapula, edge of digits (fingers), esophagus, horizontal fissure, humero-ulnar joint, interatrial septum, internal thoracic artery, left atrium, left ventricle, lower lobe of left lung, lower lobe of right lung, middle lobe of right lung, neural arch, oblique fissure, olecranon process of ulna, pericardial sac, posterior intercostal artery, rib 4 (costal cartilage), rib 5, right atrium, sternocostal muscle, trabecular part of right ventricle, transverse process, triceps brachii tendon, ulnar nerve, upper lobe of left lung, upper lobe of right lung
Source: The Virtual Human Embryo.