[2]: 297 [3] The sternal angle is a palpable and visible landmark in surface anatomy, presenting as either a slight body ridge or depression upon the upper chest wall which corresponds to the underlying manubriosternal joint.

The sternal angle is used to define the transverse thoracic plane which represents the imaginary boundary between the superior and inferior mediastinum.

[citation needed] It is located approximately 7 cm inferior to the superior margin of the manubrium.

[2]: 303 The sternal angle marks the point at which the costal cartilage of either second rib articulates with the sternum.

The optimal location for auscultation of the aortic valve is generally the right second intercostal space, whereas the optimal location for auscultation of the pulmonic valve is generally the left second intercostal space.