Insertion of extensor carpi ulnaris: (A) Base of proximal phalanx of thumb, (B) Base of Distal phalanx of thumb, (C) Base of 5th Metacarpal, (D) Scaphoid base
Answer is C. Ans. is 'c' i.e., Base of 5th MetacarpalExtensor carpi ulnariso Origin : Lateral epicondyle of humerus and posterior border ulnao Insertion : Base of 5th metacarpalo Nerve supply : Posterior interosseus nerveo Action : Extension (dorsiflexion) and adduction of hand.