Gross Anatomy Depicting the Male Anterolateral Thoracic Wall

Description

Anterior and lateral thoracic surface anatomy is rendered on an adult male torso, with the pectoral region transitioning laterally into the axilla. The clavicle and anterior axillary fold (formed by pectoralis major) define the superior and anterior margins of the axillary fossa, while the posterior axillary fold (latissimus dorsi with teres major) lies posteriorly and slightly inferiorly. Inferior to the pectoral region, the costal margin frames the lower thoracic wall as it approaches the upper abdominal wall, and the midaxillary line provides a lateral reference over the rib cage. Surface mapping of the anterolateral thoracic wall matters because it is where clinicians place hands, probes, and incisions. The axillary fossa is a key landmark for neurovascular access and examination, guiding palpation for axillary lymph nodes in breast and skin malignancy staging and orienting safe dissection planes that protect the long thoracic nerve along the medial wall and the intercostobrachial nerve crossing the axilla. Chest tube insertion and pleural procedures also depend on this region: the midaxillary approach typically targets the 4th to 5th intercostal space while staying just superior to the rib to avoid the intercostal neurovascular bundle in the costal groove. Landmarks matter. Use this artwork for gross anatomy teaching on thoracic wall topography, for clinical skills manuals covering chest drain placement, central venous access, and axillary examination, and for patient-facing diagrams where male surface landmarks must be clear without excessive internal detail. Anatomical accuracy verified by SciePro's Medical Advisory Board.