Upper Trunk or Thorax Region

Description

Presented in lateral profile, the thorax is defined by the rib cage with ribs curving posteriorly toward the thoracic spine and anteriorly toward the sternum via costal cartilages, while the clavicle and shoulder girdle contour mark the superior boundary of the chest. Along the lateral chest wall, the serratus anterior digitations and intercostal spaces sit superficial to the ribs, blending inferiorly with the external oblique as the trunk transitions toward the costal margin. The breast contour overlies the pectoralis major anteriorly, and the posterior axillary fold suggests the latissimus dorsi sweeping toward the humerus. Neutral standing posture clarifies surface landmarks. A clean lateral view matters when you need to judge chest wall shape and proportional relationships, including the spectrum of pectus deformities (pectus excavatum and pectus carinatum) that alter the anterior thoracic contour but also change the apparent curvature and spacing of the ribs. For procedures, the side profile reinforces where clinicians work on the lateral thoracic wall: tube thoracostomy and thoracentesis typically target the midaxillary line, passing just superior to a rib to avoid the intercostal neurovascular bundle that runs along the inferior costal groove. Skin tone and soft-tissue thickness are rendered in a way that supports discussions of external landmarks without pretending to be an imaging study. It is surface anatomy. Use this illustration in gross anatomy and surface anatomy teaching, preoperative patient-education materials for pectus repair or chest tube placement, and figure plates where accurate body proportions and inclusive representation of a Black adult female model are required. Anatomical accuracy verified by SciePro's Medical Advisory Board.