Musculus flexor carpi radialis brevis vel profundus

Flexor Carpi

Radialis Brevis: An Unusual Anomalous Muscle of the Wrist: Anatomical illustration of the flexor carpi radialis brevis (FCRB). The mid portion of the FCR is cut. The FCRB originates between the origin of the flexor pollicis longus (FPL) and the insertion of the pronator quadratus (PQ). The FCRB runs superficial to the PQ, and enters into the osteofibrous tunnel of the FCR.