Final answer:
The flexor carpi ulnaris muscle originates from the medial epicondyle of the humerus and the olecranon process of the ulna and inserts into the pisiform bone and the base of the fifth metacarpal bone in the hand.
Step-by-step explanation:
The flexor carpi ulnaris muscle is located in the forearm and is responsible for flexing and adducting the hand at the wrist. It originates from two points: the medial epicondyle of the humerus, which is on the inner side of the elbow, and the olecranon process of the ulna, which is the bony prominence at the back of the elbow. It then inserts into the pisiform bone and the base of the fifth metacarpal bone in the hand.