| Lumbocostal triangle of diaphragm
A triangular area in the diaphragm between its lumbar and costal parts and superior to the lateral arcuate ligament that is devoid of muscle fibers; covered by pleura superiorly and by peritoneum inferiorly; when it fails to form congenitally (a closure defect of the fetal pleuroperitoneal hiatus), the consequent foramen of Bochdalek is the most common site of diaphragmatic hernia of abdominal viscera. | |