A Lateral View of the First Thoracic Vertebra T1 of a Male

Description

Seen in lateral profile, the first thoracic vertebra (T1) sits at the cervicothoracic junction, with the vertebral body anterior and the vertebral arch, laminae, and spinous process projecting posteriorly. The superior and inferior articular processes are oriented to meet C7 above and T2 below, while the transverse processes extend laterally from the pedicle-lamina junction. Costal facets associated with T1 are implied in this segment, including the superior costal demifacet on the vertebral body for the head of rib 1 and the transverse costal facet for the tubercle of rib 1. A lateral view of T1 matters because it captures the transition from the mobile cervical spine to the more rigid thoracic cage, where facet orientation and rib articulation change biomechanics and injury patterns. This is the level where cervicothoracic trauma can produce subtle alignment shifts on lateral radiographs, and where anterior surgical access becomes more complex due to the thoracic inlet and nearby mediastinal structures. Small misreads happen here. Clear identification of the T1 vertebral body and posterior elements helps avoid wrong-level localization during instrumentation spanning C7 to T2. Use this illustration in gross anatomy and musculoskeletal modules when teaching regional differences in vertebral morphology, rib articulation, and sagittal spinal alignment. It also fits radiology primers on cervicothoracic junction landmarks and spine surgery publications discussing lateral approach planning or fixation across the C7 to T1 segment. Anatomical accuracy verified by SciePro's Medical Advisory Board.