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.
exists and is an alternate of . The ribs are attached at the thoracic region of the spinal column. There are twelve vertebra that make up the thoracic spine. Which can be referred to as T1, the top of the thoracic spine through the bottom of the thoracic spine T12 or T1 - T12.