3.3. Carpal Tunnel

Question 1

What is the Carpal Tunnel?

Answer 1

A Narrow Passageway found on the Anterior Portion of the Wrist

Question 2

What is the function of the Carpal Tunnel?

Answer 2

It serves as the Entrance to the Palm for Several Tendons and the Medial Nerve

Question 3

How many Layers form the Carpal Tunnel?

Answer 3

2

Question 4

What are the 2 Layers of the Carpal Tunnels?

Answer 4

1. Deep Carpal Arch
2. Superficial Flexor Retinaculum

Question 5

How do the Deep Carpal Arch and Superficial Flexor Retinaculum form the Carpal Tunnel?

Answer 5

A Concave Surface, which is converted into a Tunnel by the Overlying Superficial Flexor Retinaculum

Question 6

Which side of the Deep Carpal Arch is Concave?

Answer 6

The Palmar Side

Question 7

What parts of the Carpal Tunnel is formed by the Deep Carpal Arch?

Answer 7

1. Base of the Carpal Tunnel
2. Sides of the Carpal Tunnel

Question 8

What forms the Lateral Wall of the Carpal Tunnel?

Answer 8

1. Scaphoid
2. Trapezium tubercles

Question 9

What forms the Medial Wall of the Carpal Tunnel?

Answer 9

1. Hook of the Hamate
2. Pisiform

Question 10

What type of Tissue forms the Superficial Flexor Retinaculum?

Answer 10

Thick Connective Tissue

Question 11

How does the Superficial Flexor Retinaculum turn the Carpal Arch into the Carpal Tunnel?

Answer 11

By Bridging the Space between the Medial and Lateral parts of the Arch

Question 12

Where does the Superficial Flexor Retinaculum Originate from?

Answer 12

Lateral Side of the Carpal Arch

Question 13

Where does the Superficial Flexor Retinaculum insert into?

Answer 13

Medial Side of the Carpal Arch

Question 14

How many Tendons are contained in the Carpal Tunnel?

Answer 14

9

Question 15

What Surrounds the Tendons contained in the Carpal Tunnel?

Answer 15

Synovial Sheaths

Question 16

What nerve is contained in the Carpal Tunnel?

Answer 16

Median Nerve

Question 17

What Branch of the Median Nerve splits off before the Carpal Tunnel?

Answer 17

Palmar Cutaneous Branch of the Median Nerve

Question 18

Where does the Palmar Cutaneous Branch of the Median nerve travel, in relation to the Carpal Tunnel?

Answer 18

Superficially to the Superficial Flexor Retinaculum

Question 19

What are the Tendons which travel through the Carpal Tunnel?

Answer 19

1. 1 x Tendon of the Flexor Pollicus Longus
2. 4 x Tendons of the Flexor Digitorum Profundus
3. 4 x Tendons of the Flexor Digitorum Superficialis

Question 20

How many Synovial Sheaths surround the 4 Tendons of the Flexor Digitorum Profundus, and the Tendons of the Flexor Digitorum Superficialis?

Answer 20

1

Question 21

What is the only Tendon, to be contained in the Carpal Tunnel, which has its own Synovial Sheath?

Answer 21

Tendon of the Flexor Pollicus Longus

Question 22

What is the function of the Synovial Sheaths?

Answer 22

It allows Free Movement of the Tendons

Question 23

1. What Tendon is often said to be in the Carpal Tunnel, but actually isn’t?
2. Where is this actually found?

Answer 23

1. Flexor Carpi Radialis Tendon
2. Within the Flexor Retinaculum

Question 24

What happens to the Median Nerve, once it has passed through the Carpal Tunnel?

Answer 24

It Divides into 2 Branches

Question 25

What are the 2 Branches the Median Nerve Divides into after passing through the Carpal Tunnel?

Answer 25

1. Recurrent Branch of the Median Nerve
2. Palmar Digital Nerves

Question 26

What does the Recurrent Branch of the Median Nerve, innervate?

Answer 26

Thenar Muscle Group

Question 27

What do the Palmar Digital Nerve Branch, of the Median Nerve, Innervate?

Answer 27

Lateral 2 Lumbrical Muscles

Question 28

What does the Palmar Digital Nerve Branch, of the Median Nerve, provide Sensory Innervation for?

Answer 28

1. Palmar Skin
2. Dorsal Nail Beds of the Lateral 3 1/2 Digits