Bulbocavernosus
This muscle may be joined with the Transverse Perinei Superficialis.
References
Gruber, W. (1876) Über einen anomalen Musculus transverse perinei superficialis. Arch. Path. Anat. Physiol. Klin. Med. 67:353-358.
Gruber, W. (1876) Neuer Fall eines ausserhalb des Regio perinealis entsprungenen Musculus transversus perinei superficialis. Arch. Path. Anat. Physiol. Klin. Med. 68:287-290.