The phylum Chordata is a taxonomic group. All animals which have a  spine, or backbone, are classified in the phylum Chordata. There  are three subphylums in Chordata: Uroch â¦ ordata (tunicates),  Cephalachordata (lancelets), and Vertebrata (vertebrates).
The 12 vertebrae in the upper back make up what is known as the thoracic spine. They curve outward and inward to provide structure for the rib cage. The bones provide structure and flexibility for the body, while protecting the spinal colu... Read More.
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.he thoracic spine is from the base of the neck to the bottom of the rib cage. All the thoracic vertebrae-all 12 have ribs attached. The curve the thoracic spine has is call â¦ ed the thoracic curve, or kyphosis. It is normal to have a curve but if the curve is excessive or twists to the side it is abnormal.