Rectus posterior minor is a muscle located in the human body chiefly responsible for maintaining the spinal curvature in the thoracic portion of the spine. It has a few synonyms that can describe its function and location in the body. These synonyms include the following words: minor posterior straight, small back straight, short deep back muscle, and small straight muscle. While each word may slightly differ in denotation and connotation, they all convey the same meaning of balance and stability in the spinal region. Understanding the synonyms for rectus posterior minor can help medical professionals, students, and enthusiasts communicate better about the anatomy of the human body.