Ultrasound normal median nerve

This is a real-time axial image of the normal median nerve (arrow), initially at the distal wrist crease. The probe is then slowly moved proximally, in the axial plane, to the mid forearm. Note that the median nerve is initially somewhat speckled but that as the probe moves proximally, the nerve acquires the more classic honeycomb appearance with hypoechoic rounded fascicles surrounded by hyperechoic fibrous tissue. The nerve wraps around and dives deep to the flexor digitorum sublimis muscle and superficial to the flexor digitorum profundus muscle; note the shape change of the nerve from oval to round to triangular to cuboidal as the probe moves up the forearm.