Articular Facet Of The Tubercle On The Rib

Description

Articular facet of the rib tubercle sits on the posterior aspect of a typical rib near the junction of the neck and shaft, forming a smooth ovoid surface that faces medially and slightly posteriorly toward the transverse process of the corresponding thoracic vertebra. The tubercle itself projects posteroinferiorly, while the costal angle and lateral shaft extend away laterally and anteriorly within the same frame. Adjacent cortical contours help orient the viewer to the superior and inferior borders of the rib and to the transitional geometry between neck, tubercle, and body. Compact bone texture and the sharply bounded articular cartilage surface are differentiated to separate joint surface from surrounding non-articular cortex. The costotransverse joint is a common point of confusion in thoracic osteology because it is distinct from the costovertebral (head) articulation, and it becomes clinically relevant in thoracic pain syndromes and spine surgery planning. In the upper ribs, the tubercle facet articulates with the transverse process of the same-numbered vertebra, while ribs 11 and 12 lack this facet and do not form a costotransverse joint at all, a detail that matters when teaching atypical ribs and when interpreting posterior rib fractures on CT. Lighting emphasizes the curvature around the tubercle and neck, which helps clarify where the superior costotransverse ligament attaches near the crest of the neck compared with the facet itself. A small surface, big consequences. Use this illustration for gross anatomy practicals on the thoracic cage, for orthopedic and radiology teaching slides on rib and vertebral joint anatomy, and for medical publishing figures explaining posterior thoracic wall mechanics and pain generators. It also supports surgical education on posterior approaches where rib neck and tubercle landmarks guide level identification. Anatomical accuracy verified by SciePro's Medical Advisory Board.