IntroductionThe muscular variations in the forearm have been recognized as causing neurovascular compressions. These variations are mostly detected during routine anatomical dissections or during operations. A clinician should have a thorough knowledge of these variations for understanding the unusual symptoms and signs due to nerve compression. Here, we report the presence of a rare variant head of flexor digitorum profundus (FDP) muscle in forearm. Materials and methodsDuring routine cadaveric dissection done on the upper limb of a 52-year-old male in the Department of Anatomy, HIMSR, New Delhi, a well-developed muscle of anomalous origin was discovered in the flexor compartment of the forearm. The muscles, blood vessels and the nerves of the forearm were dissected carefully following the usual dissection steps. The specimen was studied in detail and photographs were taken. ObservationsThe anomalous muscle that appeared to be an accessory belly of FDP was taking origin from the middle two-fourths of radius and from the adjoining interosseous membrane. Distally, it was attached to the lateral aspect of FDP. The anterior interosseous nerve and vessels supplied the accessory belly and traversed deep to it. The FDP displayed the normal attachments and innervations other than this. ConclusionVery few cases have been reported on the origin of accessory belly of FDP. Awareness of the possibility of such anomalous muscle is important for neurophysicians and hand surgeons undertaking reconstructive procedures for compression syndromes and tenosynovitis.