transverse processes are long, and the upper vertebral notches are deeper than those of the other thoracic vertebrae.

The thoracic spinal nerve 1 (T1) passes inferior to it.

Second thoracic vertebra (T2)

The thoracic spinal nerve 2 (T2) passes inferior to it.The second thoracic vertebra is larger than the first thoracic vertebra.

Third thoracic vertebra (T3)