<prompt> A boy fell down from a tree and has fracture of neck of humerus. He cannot raise his arm because of the involvement of:Axillary nerveSupraspinatus nerveMusculocutaneus nerveRadial nerve  <response>: A i.e. Axillary nerve Axillary Nerve C5C6 Motor supply - Deltoid causing shoulder abduction Q - Teres minorQ laterally rotate the arm stabilizes the shoulder joint Sensory supply Skin over lower half of deltoid by upper lateral cutaneous nerve of armQ 