ANGLE OF LOUIS Meaning and
Definition
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The "angle of Louis," also known as the sternal angle or manubriosternal joint, is a landmark located at the anterior aspect of the sternum, specifically at the junction between the manubrium and body of the sternum. It is named after Antoine Louis, a French surgeon who first described its significance.
Anatomically, the angle of Louis serves as a crucial reference point in clinical practice, as it marks the level of various important structures and landmarks within the thoracic cavity. It corresponds to the second costal cartilage, which connects the second rib to the sternum. As such, it can be easily palpated and used as a guide for counting ribs and identifying other relevant structures.
The angle of Louis also serves as a reference for other important anatomical structures. For instance, it indicates the level of the superior border of the heart, the transition from the superior to the inferior mediastinum, the division between the trachea and the main bronchi, as well as the level at which the arch of the aorta begins and ends. Furthermore, it assists in locating the second intercostal space, which is of great clinical significance in procedures such as auscultation and administering intravenous drugs.
Overall, the angle of Louis plays a significant role in anatomical and clinical assessments, aiding healthcare professionals in the accurate identification and localization of various structures within the thoracic cavity.
