costal arch
costal margin

Ortner's sign - tenderness when hand taps the edge of right costal arch.

Behind this the diaphragm separates the liver from the lower part of the lungs and pleuræ, the heart and pericardium and the right costal arches from the seventh to the eleventh inclusive.

The costal margin, sometimes referred to as the costal arch, is the medial margin formed by the false ribs and one true rib-specifically, from the seventh rib to the tenth rib.

Dysfunction of the Liver typically presents as irritability, anger, headaches, dysmenorrhea, belches, bitter taste in the mouth, distension, pain under the costal arches, pain in the upper abdomen, tremors/numbness/stiffness of the limbs, blurry vision, or jaundice.

"Of what use is it for a student of medicine to know that the cranium is composed of vertebral elements-that such and such bones of the face correspond to costal arches; and that certain bones and muscles of the upper extremities correspond to other bones and muscles in the lower?