Fig. 1.

Transverse grayscale US of normal median nerve at proximal border of pronator quadratus muscle (A, B), proximal to carpal tunnel inlet (C, D), at tunnel inlet (E, F) and at tunnel outlet (G). Orange dotted circle and M – median nerve; FPL – flexor pollicis longus muscle; FDS – flexor digitorum superficialis muscle; PQ – pronator quadratus muscle; FCR – flexor carpi radialis muscle; FDP – flexor digitorum profundus muscle; R – radius; white dotted line – os lunatum; pink dotted line – flexor retinaculum. Reference: Medical Imaging. Riga East Clinical University Hospital