The thoracic duct serves as a duct which lymph drains into which then drains into the venous system before returning to the heart to be cleansed and recirculated.
It pertains to the thorax... But you can use it as a thoracic spine, thoracic surgery, thoracic cavity, thoracic outlet syndrome, thoracic spine pain, thoracic vertebrae, thoracic medicine, thoracic surgeons, thoracic strains, sprain thoracic, or thoracic spine disorder; it's pretty self explanatory.
The phrase "calcification of the thoracic" is incomplete. There a missing word after "thoracic."
The body cavity bounded by the ribs is the thoracic cavity. It contains the heart, lungs, and other structures involved in breathing and circulation.
...the thoracic cavity...
The upper limit of the human thoracic cavity is the superior thoracic aperture, which is also known as the thoracic inlet. This aperture is bounded by the first thoracic vertebra, the first pair of ribs, and the superior border of the manubrium of the sternum.
thoracic vertebrae
thoracic 4
The pleural cavities, ventral and thoracic
The coastal processes are located on the thoracic vertebrae. These processes articulate with the ribs to form the thoracic cage, which protects the vital organs in the thoracic cavity.
The ribs articulate with the thoracic vertebrae. The thoracic vertebrae also articulate with each other.
Twelve thoracic vertebrae, same as you have.
Thoracic http://en.wikipedia.org/wiki/Thoracic