T1 Vertebra Section, Lateral View

Description

Positioned at the cervicothoracic junction, the first thoracic vertebra (T1) is shown in lateral profile with the vertebral body anterior and the vertebral arch and spinous process posterior. A long, inferiorly sloping spinous process projects posteriorly, while the superior and inferior articular processes align to form the zygapophysial (facet) joints with C7 above and T2 below. Costal facets for the first rib are visible at the posterolateral margin of the vertebral body (superior costal facet) and at the transverse process (transverse costal facet), defining the thoracic pattern that distinguishes T1 from typical cervical vertebrae. Intervertebral discs lie between adjacent vertebral bodies, maintaining spacing along the vertebral column. T1 matters because it anchors the first rib and marks the transition from cervical mobility to thoracic rigidity, a boundary that influences both biomechanics and clinical pattern recognition. Degenerative change at the C7 to T1 segment often presents differently than mid-cervical spondylosis, and surgeons planning a posterior cervicothoracic approach track the prominent C7 spinous process against the more caudally angled thoracic spines to avoid wrong-level exposure. Small space, high stakes. Rib head and tubercle articulation at T1 also explains why upper thoracic fractures or costovertebral joint sprain can refer pain into the shoulder girdle and upper chest. Use this lateral T1 vertebra view for gross anatomy teaching of thoracic vertebra identifiers, osteology labs comparing C7 versus T1, and spine biomechanics modules that tie regional curvature to load transfer. It also suits textbooks and case-based materials on cervicothoracic junction surgery, rib articulation, and vertebral level localization in radiology correlation. Anatomical accuracy verified by SciePro's Medical Advisory Board.