Which structure is NOT included in the contents of the carpal tunnel?

The ulnar nerve is not included in the contents of the carpal tunnel, making it the correct answer. The carpal tunnel is a narrow passageway in the wrist that is bounded by the carpal bones and the transverse carpal ligament. Its primary contents include several tendons and the median nerve.

The median nerve and the tendons of the flexor digitorum profundus and flexor pollicis longus do pass through the carpal tunnel. The median nerve is essential for motor function and sensation in the hand, while the flexor tendons are crucial for finger movements. The ulnar nerve, however, runs outside this tunnel, traveling through a different anatomical pathway, which is why it does not belong to the structures found within the carpal tunnel.