The 1st thoracic vertebra of the human body is at the junction of the neck and the chest. To locate the 1st thoracic vertebra, you should first locate the spinous process of the 1st thoracic vertebra, which is a bony structure protruding from the back of the human spine and located on the midline of the back side of the human body, from the cervical vertebra to the thoracic vertebra all the way to the upper part of the lumbar vertebra, and to locate the spinous process of the 1st thoracic vertebra of the human body, you should first locate the spinous process of the 7th cervical vertebra of the human body position. When the body maintains a low neck posture, a relatively prominent skeletal structure will be seen at the junction of the neck and the chest, and this position is the spinous process of the seventh cervical vertebra, and then down a bony protruding structure is the spinous process of the first thoracic vertebra. The spinous processes of the vertebrae extend obliquely downward and backward, so the horizontal position of the 1st thoracic vertebra should be at the spinous process of the first thoracic vertebra, and then upward about 2-3 cm.