Diaphragm, Posterior View

Description

Posteriorly, the diaphragm forms a domed musculotendinous partition spanning the inferior thoracic aperture, with the right and left crura descending to anchor along the anterolateral surfaces of the upper lumbar vertebral bodies and intervertebral discs. Medially, the crura and median arcuate ligament frame the aortic hiatus in front of the vertebral column, while the sympathetic trunks run vertically along the lumbar spine just lateral to these attachments. Laterally, the costal part of the diaphragm interdigitates with the inferior ribs and costal cartilages, and the peripheral muscle fibers converge toward the central tendon positioned superior to the upper abdominal viscera. Intercostal muscle slips appear between posterior rib segments. Clean landmarks. Functionally, this posterior angle clarifies how diaphragmatic contraction couples the thorax to the lumbar spine, a relationship that matters in both respiration and trunk mechanics. The crural fibers form a dynamic sling around the esophageal hiatus, so hypertrophy or altered tone can contribute to reflux physiology and helps explain why hiatal hernia repair and fundoplication focus on reapproximating the crura behind the esophagus. The same crural architecture also orients you to the retrocrural space, where pathology such as posterior mediastinal masses or lymphadenopathy can track along the vertebral column and mimic paraspinal disease on cross sectional imaging. Use this plate in gross anatomy and respiratory physiology teaching to anchor the difference between the costal and crural diaphragm, and in surgical education when discussing posterior approaches to the thoracoabdominal junction, including hiatal hernia repair, aortic exposure at the hiatus, and lumbar sympathectomy planning. It also reads well in radiology or anatomy atlases when paired with coronal CT or MRI through the diaphragmatic crura and aortic hiatus. Anatomical accuracy verified by SciePro's Medical Advisory Board.