The thoracic vertebrae are located in the center of the back of the body, and there are twelve of them, from below the cervical vertebrae to above the lumbar vertebrae. The left and right sides of the thoracic vertebrae are connected to the corresponding ribs, and the ribs are connected to the sternum through the rib cartilage in front, thus forming the thoracic contour of the human body. Patients can locate the upper and lower boundaries of the thoracic spine in the following ways: 1. Patients can find the upper boundary of the thoracic spine through the lowermost part of the cervical spine. At this point, the patient is asked to remain seated and then extremely low, so that a very obvious bony protrusion can be felt at the back of the neck, where the spinous process of the seventh cervical vertebra is located. The seventh cervical vertebra is also called the augmentation vertebra, so this area is very elevated and below this is the first thoracic vertebra; 2. The patient can find the lowermost thoracic vertebra by counting the ribs. The patient can feel the lowermost rib, the twelfth rib, in the bilateral lumbar region, and feel in the direction of the spine along the twelfth rib, and the part where the twelfth rib crosses the spine is the twelfth thoracic vertebra, which is the lowermost part of the thoracic vertebra.