Which structure covers SDF and DDF tendons?

Which structure covers SDF and DDF tendons?

• A. Carpal capsule
• B. Flexor retinaculum
• C. Palmar fascia
• D. Carpal retinaculum

Answer: (D)

The tendons of the superficial and deep digital flexors pass into the hand under a strong band that forms the roof of the carpal tunnel. This structure is the carpal retinaculum, also called the flexor retinaculum. It spans the carpal bones and keeps the flexor tendons in place as they enter the palm. That’s why the carpal retinaculum is the correct covering. The other options don’t serve this role: the carpal capsule is the joint capsule around the wrist, the palmar fascia covers the palm, and the retinaculum in this context is the same structure but named differently.

The tendons of the superficial and deep digital flexors pass into the hand under a strong band that forms the roof of the carpal tunnel. This structure is the carpal retinaculum, also called the flexor retinaculum. It spans the carpal bones and keeps the flexor tendons in place as they enter the palm. That’s why the carpal retinaculum is the correct covering. The other options don’t serve this role: the carpal capsule is the joint capsule around the wrist, the palmar fascia covers the palm, and the retinaculum in this context is the same structure but named differently.