T4 Vertebra, Gross Anatomy

Description

Centered in the mid thoracic column, the T4 vertebra sits inferior to T3 and superior to T5 within the normal thoracic kyphosis, with intervertebral discs separating each vertebral body. A lateral view logically brings the vertebral bodies and disc spaces into profile, while the pedicles and broad laminae enclose the vertebral foramen posterior to the body and support the posterior elements. From this perspective, the spinous processes project posteriorly and slightly inferiorly, and the superior and inferior articular processes align to form the zygapophysial (facet) joints at the T3 to T4 and T4 to T5 levels. Costal facets on the vertebral body and transverse process are expected landmarks in this region given the thoracic vertebrae’s relationship to the ribs. T4 is a practical level to teach thoracic segment identity because it lies near the plane of the sternal angle (T4 to T5), a common surface landmark used to count ribs and thoracic vertebrae and to localize mediastinal structures. The thoracic facet joint orientation and rib articulations constrain flexion and extension while favoring rotation, which helps explain the typical pain pattern in thoracic zygapophysial joint irritation and the mechanics behind rib dysfunction. Small changes in disc height at T4 to T5 or osteophyte formation are also easy to appreciate in a lateral stack, mirroring what clinicians look for on plain radiographs. Use this illustration when you need a clean thoracic segment reference for gross anatomy labs, medical school spine blocks, or radiology teaching files that correlate kyphotic curvature with disc spaces and vertebral levels. It also fits well in orthopedic and neurosurgical publications discussing thoracic approach planning, level counting, or thoracic spondylosis. Anatomical accuracy verified by SciePro's Medical Advisory Board.