During routine forearm dissection of 12 cadavers, which originated from the PCOM Georgia Body Donor Program, at PCOM South Georgia, an aberrant muscle was discovered on the dorsal surface of the hand of a 72-year-old Caucasian male. The muscle, known as the Extensor Digitorum Brevis Manus (EDBM), was located bilaterally and deep to the tendons of the Extensor Digitorum. On assessment, the left hand of the donor had two EDBM tendons that intersected and attached to the proximal phalanx of the third digit. The right-hand tendons ran parallel and inserted onto the third digit of the proximal phalanx. An investigation of the cadaveric origin and insertion sites as well as the anatomical structure is presented. In addition, this case study analyzes the anomalous EDBM muscle along with its clinical significance and prevalence.