First Thoracic Vertebra T1, Posterior View

Description

Arising at the cervicothoracic junction, the first thoracic vertebra (T1) sits inferior to C7 and superior to T2, centered on the posterior midline of the spinal column in a male. From a posterior perspective, the midline spinous processes form a stacked ridge, with T1 identifiable by its long, inferiorly sloping spinous process and the broader laminae leading laterally to the transverse processes. Just lateral to the vertebral arch, the superior articular processes face posteromedially while the inferior articular processes angle anterolaterally, defining the transition from cervical to thoracic facet orientation. Adjacent cervical, thoracic, lumbar vertebrae, plus the sacrum and coccyx, provide level-to-level context. T1 matters because it marks the first vertebral level with costal facets for rib articulation, anchoring the first rib and contributing to the thoracic inlet. That junctional anatomy is a common source of level-counting errors when correlating plain radiographs, CT, or MRI, and it is also the bony reference point for cervicothoracic procedures where anatomy shifts from mobile cervical spine to the more constrained thoracic segment. Small differences in spinous process slope and facet orientation can influence interpretation of trauma patterns and surgical planning at C7 to T2. A hard boundary. Use this posterior T1-focused spine image for gross anatomy labs, radiographic anatomy teaching on vertebral level identification, and textbook figures discussing the cervicothoracic transition and first-rib articulation. It also supports clinical education materials on cervicothoracic junction injuries and operative approaches that require accurate vertebral counting. Anatomical accuracy verified by SciePro's Medical Advisory Board.