Anterolateral Thoracic Wall, Lateral View

Description

Seen in lateral profile, the anterolateral thoracic wall contour is defined by the rib cage from the superior ribs beneath the axillary fold down toward the costal margin, with the anterior chest blending into the lateral chest at the anterior axillary line. Along the lateral border of the pectoralis major, the soft-tissue envelope transitions toward the serratus anterior region overlying ribs 1 to 8, and posteriorly toward the anterior edge of latissimus dorsi forming the posterior axillary fold. The intercostal spaces lie between adjacent ribs, their surface intervals narrowing superiorly and widening slightly inferiorly as the thorax expands caudally. Clear surface landmarks. For clinical teaching, this anterolateral view anchors the safe corridor for pleural access: chest tube thoracostomy is commonly performed at the 4th or 5th intercostal space near the midaxillary line, advancing just superior to the rib to avoid the intercostal neurovascular bundle that runs along the inferior rib margin. The same surface geography matters when discussing long thoracic nerve injury on the chest wall, where serratus anterior weakness can present as scapular winging that becomes more obvious when pushing against resistance, and when planning lateral breast or axillary surgery where the pectoral border and axillary folds guide incision placement and dissection planes. Use this illustration for surface anatomy modules in thorax and breast units, clinical skills curricula covering inspection and palpation of the chest wall, and publisher layouts that need an accurate lateral thoracic silhouette for landmark annotation (anterior and posterior axillary lines, midaxillary line, costal margin). It also works well in patient-facing materials explaining rib fracture pain patterns or chest drain placement without showing internal organs. Anatomical accuracy verified by SciePro's Medical Advisory Board.