An Anomalous Muscle in the Forearm Extensor Compartment

The presence of additional muscles in the forearm extensor compartment is frequently encountered during surgical procedures and anatomical dissections. There are several types of anomalous muscles such as the extensor indicis proprius, the extensor digitorum brevis manus, the extensor medii proprius, and the extensor indicis et medii communis that have been previously reported in the medical literature. In this case study, we have observed an anomalous muscle in the forearm extensor compartment that originated from the proximal one-third of the ulna and was found to be inserted into the tip of the styloid process of the radius. The probable clinical and embryological significance of the present case is discussed herein.