system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Structure which does NOT pass under flexor retinaculum -
assistant
The correct answer is  Structures superficial to flexor retinaculum

        Palmaris longus
        Ulnar vessels and nerve
        Palmar cutaneous branches of median and ulnar nerves.

 Structures deep to flexor retinaculum

      Median nerve
       Flexor digitorum superficialis
       Flexor digitorum profundus
       Flexor pollicis longus
       Flexor carpi radialis