Origin Humeral head: medial epicondyle of humerus; Ulnar head: olecranon and posterior border of ulna
Insertion Pisiform bone, hook of hamate bone, and 5th metacarpal bone
Action Flexes and adducts hand (at wrist)
Innervation Ulnar nerve (C7 and C8) (C7, C8)
Arterial Supply Ulnar artery


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