Rhomboid minor is a muscle located in your upper back that helps control your shoulder blade movement. While this may be the proper medical term for the muscle, there are several synonyms that can be used to describe it. For instance, the rhomboid minor can also be referred to as the "small rhomboid muscle" or the "lesser rhomboid muscle". Another common synonym for this muscle is the "minor rhomboid muscle". These names are commonly used interchangeably and can be useful when discussing the anatomy and function of the rhomboid muscle group.