Anterolateral Thoracic Wall, Anterior View

Description

Oriented in anatomical position, the highlighted anterolateral thoracic wall spans inferior to the clavicles and suprasternal notch, across the pectoral region overlying the sternum and costal cartilages, then laterally toward the anterior axillary line. Superficially, the contour follows the mammary region and the fibers of pectoralis major as they converge laterally toward the humerus, with the deltopectoral groove marking the transition into the shoulder. Deeper layers implied by the surface topography include pectoralis minor deep to pectoralis major, serratus anterior over the lateral ribs, and the intercostal spaces between adjacent ribs. Clear anterior landmarks. Clinically, this surface geography maps directly to common access points and hazard zones on the chest. Placement of ECG precordial leads (V1 to V6) relies on accurate identification of intercostal spaces along the sternum and midclavicular line, and miscounting ribs shifts leads enough to distort ST segment interpretation. The same anterolateral corridor frames surgical planning for mastectomy and axillary lymph node procedures, where dissection near the lateral border of pectoralis major approaches the clavipectoral fascia and risks injury to the long thoracic nerve on serratus anterior, a classic cause of scapular winging. Teaching teams use this view to anchor surface anatomy before moving to cross sectional imaging of the chest wall, pleura, and upper abdomen. It also fits medical publishing needs for patient education on breast and thoracic surgery incisions, chest wall pain syndromes such as costochondritis, and physical exam landmarks for percussion and auscultation. Anatomical accuracy verified by SciePro's Medical Advisory Board.