Which muscle is involved in carpal tunnel?

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The carpal tunnel is a passage under the flexor retinaculum that carries the median nerve plus the tendons of the finger flexors to the hand. Among the options, the tendon that actually traverses the carpal tunnel is the flexor digitorum superficialis. Its tendons go through the tunnel with the other flexor tendons (along with the flexor digitorum profundus tendons and the flexor pollicis longus). The flexor carpi radialis tendon runs in a separate canal on the radial side and does not pass through the carpal tunnel; the palmaris longus, when present, forms part of the palmar aponeurosis and is not inside the tunnel; the pronator teres is in the forearm and, if compressed, causes pronator teres syndrome proximal to the carpal tunnel, not within it. So, the tendon actually passing through the carpal tunnel among these options is the flexor digitorum superficialis.