Regarding the innervation of the hand

• A. Palmar branch of the medial nerve passes under the flexor retinaculum
• B. The ulnar 1 fingers are supplied by the deep branch of the ulna nerve
• C. The deep branch of the ulna nerve supplies the interossei mm
• D. The common palmar digital nerve lies superficial to the palmar arch
• E. Carpal tunnel syndrome results in the loss of flexion of the IPJ of thumb