T3-T4 disc: Definition, Uses, and Clinical Overview
The T3-T4 disc is the intervertebral disc between the third (T3) and fourth (T4) thoracic vertebrae. It acts like a shock absorber and spacer in the upper-mid back (upper thoracic spine). Clinicians commonly refer to the T3-T4 disc when describing MRI findings, pain patterns, or spinal cord/nerve compression at that level. It is also referenced when planning non-surgical care or surgery involving the T3–T4 motion segment.