<prompt> A nerve injured in radical neck dissection leads to loss of sensation in medial side of the arm, nerve injured is:-Long thoracic nerveThoracodorsal nerveDorsal scapular nerveMedial cutaneous nerve of arm  <response>: Nerve injured in radical neck dissection leads to loss of sensation in medial side of the arm, nerve injured is medial cutaneous nerve of arm. The medial cutaneous nerve of arm supplies the skin of the medial aspect of the arm. It is the smallest branch of the brachial plexus, and arises from the medial cord and contains fibres from the eighth cervical and first thoracic ventral rami. 