Multifidus is the name of a muscle located in the back of the human body. This muscle plays an important role in maintaining posture and stabilizing the lumbar spine. There are several synonyms for the word multifidus that can be used interchangeably, depending on the context. These synonyms include spinalis, longissimus, and semispinalis. These terms refer to the various muscles of the back that work together to help maintain stability and alignment of the spine. Understanding the different synonyms for multifidus can help in better communication between healthcare professionals and their patients when discussing back pain or spinal issues.