Fig. 1

Sonoanatomy of the palmar cutaneous branch of the median nerve. Short-axis views of the palmar cutaneous branch of the median nerve at different levels from the distal forearm to the wrist. A Origin of the PCN from the lateral aspect of the median nerve at the distal third of the forearm appearing as a tiny round hypoechoic fascicle separating from the main median nerve trunk. B A level distal to level A showing the PCN diverting away from the median nerve and running underneath the deep brachial fascia. C The PCN as it pierces the antebrachial fascia. D The PCN lying in the subcutaneous tissue after it pierces the deep brachial fascia, running superficial to the carpal tunnel and medial to the FCR tendon