Carpal Tunnel & Flexor Retinaculum

Question 1

What nerve is spared in carpal tunnel syndrome

Answer 1

Palmar cutaneous branch of median nerve (leads to sparing of sensation over thenar eminence)

Question 2

Where does the flexor retinaculum originate

Answer 2

Tubercle of scaphoid

Ridge of trapezium

Question 3

Where does the flexor retinaculum insert

Answer 3

Pisiform

Hook of hamate

Question 4

What inserts into the flexor retinaculum

Answer 4

Palmaris brevis
Palmaris longus
Palmar aponeurosis

Question 5

What emerges from the edge of the flexor retinaculum

Answer 5

Thenar muscles

Hypothenar muscles

Question 6

What runs superficial to the flexor retinaculum

Answer 6

Ulnar artery
Ulnar nerve
Palmar cutaneous branch of median nerve
Palmar branch of radial artery

Question 7

What is the Canal of Guyon

Answer 7

Transports ulnar nerve and artery over flexor retinaculum

Question 8

What lies within the carpal tunnel (deep to the flexor retinaculum)

Answer 8

Median nerve
4 tendons of flexor digitorum profundus
4 tendons of flexor digitorum superficialis
Tendon of flexor pollicis longus
Flexor carpi radialis (in its own compartment)