Fifth Rib, Medial View

Description

Arising from the fifth thoracic vertebra, the fifth rib is presented from its medial (internal) surface, with the head and neck positioned posteriorly and the costal shaft sweeping anterolaterally toward the costal cartilage. The angle of the rib creates an abrupt change in curvature along the posterolateral shaft, after which the internal surface becomes a broad concavity that would normally face the pleura. At the tubercle, the articular facet for the transverse process sits just lateral to the neck, while the vertebral end remains closest to the thoracic spine. A clean osseous landmark. Medial rib anatomy matters when you are teaching or planning procedures that track the pleural boundary and the intercostal space rather than the external contour of the thoracic cage. The fifth rib defines the fifth intercostal space, a common corridor for tube thoracostomy and for video-assisted thoracoscopic surgery ports, where staying immediately superior to the sixth rib helps avoid the intercostal neurovascular bundle in the costal groove. Posteriorly, the costotransverse and costovertebral joints are frequent pain generators after trauma and can be targeted in regional anesthesia (paravertebral or erector spinae plane blocks) using the rib and transverse process as palpable or sonographic reference points. Use this illustration in gross anatomy and musculoskeletal modules to orient students to rib parts (head, neck, tubercle, angle, shaft) and to reinforce how thoracic vertebrae dictate rib numbering and intercostal space selection. It also supports surgical atlases, anesthesia teaching files, and radiology primers that correlate posterior rib landmarks with thoracic spine levels on CT and lateral radiographs. Anatomical accuracy verified by SciePro's Medical Advisory Board.