Posterior Compartments of the Forearm, Dorset of Hand, Extensor Muscles

Question 1

What are the Superficial Muscles of the Extensor Compartment of the Forearm?

Answer 1

1. Anconeus
2. Extensor Carpi Radialis Brevis
3. Extensor Carpi Radialis Longus
4. Extensor Digitorum
5. Extensor Digiti Minimi
6. Extensor Carpi Ulnaris

Question 2

What are the Deep Muscles of the Extensor Compartment of the Forearm?

Answer 2

1. Supinator
2. Extensor Pollicis Brevis
3. Abductor Pollicis Longus
4. Extensor Pollicis Longues
5. Extensor Indicis

Question 3

What is the nerve supply to the Extensor Muscles?

Answer 3

Radial Nerve

Question 4

Describe the pathway of the Radial Nerve

Answer 4

1. The Radial Nerve gives off the Posterior Cutaneous Nerve of Arm
2. The Radial Nerve gives off branches to Triceps and Anconeus
3. The Radial Nerve gives off the Posterior Cutaneous Nerve of Forearm and Lower Lateral Cutaneous Nerve of Arm
4. The Radial nerve gives off Branches to Brachialis, brachioradialis and Extensor Carpi Radialis Longus
5. The Radial Nerve gives off Deep Branch to Posterior Interosseous Nerve
6. The Superficial Branch goes to sensory innervate the hand

Question 5

What is the importance of the Radial Nerve?

Answer 5

If the Radial Nerve is cut–> Wrist drop

Question 6

What parts of the hand does the Radial Nerve give Sensory Innervation to?

Answer 6

1. Lateral 2/3 back of hand

2. Radial 3.5 Digits (except tips) on dorsal side

Question 7

What muscles go under the Extensor Retinaculum?

Answer 7

1. Abductor Pollicis Longus
2. Extensor Pollicis Longus
3. Extensor Carpi Radialis Longus and Brevis
4. Extensor Digitorum and Extensor Indicis
5. Extensor Digiti Minimi
6. Extensor Carpir Ulnaris

Question 8

What are the boundaries of the Anatomical Snuffbox?

Answer 8

1. Extensor Pollicis Longus
2. Extensor Pollicis Brevis
3. Abductor Pollicis Longus

Question 9

What is the roof of the Anatomical Snuffbox?

Answer 9

1. Cephalic Vein

2. Superficial Branch of Radial Nerve

Question 10

What is the floor of the Anatomical Snuffbox?

Answer 10

1. Scaphoid
2. Trapezium
3. Radial Styloid

Question 11

What is the contents of the Anatomical Snuffbox?

Answer 11

Radial Artery

Question 12

What causes the dislocation of the radial head?

Answer 12

Vertical Traction on the arm–> pulling too hard on the arm

Question 13

Describe a Colles Fracture

Answer 13

It is the Dorsal Displacement of the wrist–> “Dinner Fork Deformity” where “the carpus and base of the metacarpus appear to be thrown backward”

Question 14

Describe a Smith’s Fracture

Answer 14

Anterior Displacement of the wrist–> “Reverse Colles Fracture”

Question 15

Describe a Bennet’s Fracture

Answer 15

Fracture and Dislocation of the 1st Metacarpal Bone at the base of the thumb