<prompt> All of the following muscles undergo paralysis after injury to C5 and C6 spinal nerves EXCEPTBiceps brachiCoracobrachialisBrachialisBrachioradialis  <response>: This is a controversial question, since a lesion of C-5,6 will paralyse all the given muscles. The most appropriate option Coracobrachialis has been taken as the answer. Coracobrachialis is innervated through the anterior division of C5, 6 and 7 segmental levels Grays Anatomy Ed 41. Hence, a lesion at C5 and 6 may not paralyse coracobrachialis completely, as C-7 is still intact. Brachioradialis is supplied by root value C-5 and 6, so compromised. Biceps brachii has the root value C-5,6, hence paralysed. Brachialis: is supplied by C-5,6,7 Dominant value is C-6, thence compromised. 