Flexor Retinaculum

Question 1

Definition:

Answer 1

It is a strong band of deep fascia that stretches across the anterior surface of the carpal bones converting the concavity of the carpus into a tunnel for the passage of the flexor tendons from the forearm to the hand

Question 2

Attachments
a. Medially

Answer 2

1. Pisiform
2. Hook of hamate

Question 3

Attachments
b. Laterally

Answer 3

splits into 2 laminae:
1. Superficial lamina - Attached to the tubercle of scaphoid and crest of trapezium
2. Deep lamina - Attached to the medial lip of of the groove on the trapezium

between the 2 laminae lies the tendon of flexor carpi radialis in a special compartment outside the carpal tunnel

Question 4

Attachments
c. Above

Answer 4

It is continuous with the deep fascia of the forearm

Question 5

Attachments
d. Below

Answer 5

Its lower border is continuous with the palmar aponeurosis

Question 6

Function

Answer 6

Acts as a strap, binding down the flexor tendons preventing them from springing away from the bone during flexion of the wrist joint

Question 7

Structures passing superficial to the flexor retinaculum (from medial to lateral)

Answer 7

1. Ulnar nerve (just lateral to pisiform bone)
   2.Ulnar artery (just lateral to ulnar nerve)
2. Palmar cutaneous branch of ulnar nerve
3. Palmaris longus tendon
4. Palmar cutaneous branch of median nerve