The term "musculus flexor digitorum longus" refers to a specific muscle group found in the lower leg. This muscle is responsible for flexing the toes downward. While "musculus flexor digitorum longus" is the scientific name for this muscle, there are several synonyms that can be used to describe it. Some alternative names for this muscle include the long flexor muscle of the toes, the FD longus, and the long digital flexor muscle. These synonyms can be helpful when discussing this muscle group in a more accessible and less technical manner.