Spinae is a word that is commonly used in anatomy to refer to the muscles of the back. However, there are several synonyms for this word that can be used interchangeably. The most common synonyms for spinae include erector spinae, sacrospinalis, and spinalis muscles. These muscles originate from the pelvis and attach to the spine, and they are responsible for providing stability and support to the back. Other less commonly used synonyms for spinae include the longissimus and iliocostalis muscles. When describing the anatomy of the back, it is important to be familiar with these synonyms and to use them appropriately.