4.1.1. Extensor and Abductor/Addutor Muscles of the Hand at the Wrist Joint

Question 1

What are the Muscles of the Posterior Forearm commonly known as?

Answer 1

Extensor Muscles

Question 2

What is the General Function of these Muscles?

Answer 2

To Produce Extension at the Wrists and Fingers

Question 3

Which Nerve innervates the Muscles of the Posterior Forearm?

Answer 3

The Radial Nerve

Question 4

1. How many groups can the Muscles of the Posterior Forearm be Divided into, Anatomically?
2. What are they?

Answer 4

1. 2
2. a) Superficial Muscles of the Posterior Forearm
3. b) Deep Muscles of the Posterior Forearm

Question 5

1. How many groups can the Muscles of the Posterior Forearm be Divided into, Functionally?
2. What are they?

Answer 5

1. 3
2. a) Muscles which Extend and Abduct / Adduct the Hand at the Wrist Joint
3. b) Muscles which Extend the Medial 4 Digits
4. c) Muscles which Extend or Abduct the Thumb

Question 6

What are the 3 Muscles which Extend and Abduct / Adduct the Hand at the Wrist Joint?

Answer 6

1. Extensor Carpi Radialis Longus
2. Extensor Carpi Radialis Brevis
3. Extensor Carpi Ulnaris

Question 7

Where are the Extensor Carpi Radialis Longus Positioned in the Posterior Forearm?

Answer 7

Laterally

Question 8

Is the Extensor Carpi Radialis Longus an Anatomically Superficial or Deep Muscle of the Posterior Forearm?

Answer 8

Superficial

Question 9

Where does the Extensor Carpi Radialis Longus Originate from?

Answer 9

Supracondylar Ridge of the Humerus

Question 10

Where does the Extensor Carpi Radialis Longus attach distally?

Answer 10

1. Metacarpal II
2. Metacarpal III

Question 11

What is the function of the Extensor Carpi Radialis Longus?

Answer 11

1. Extension of the Wrist
2. Abduction of the Wrist

Question 12

What is the innervation of the Extensor Carpi Radialis Longus?

Answer 12

Radial Nerve

Question 13

Where are the Extensor Carpi Radialis Brevis Positioned in the Posterior Forearm?

Answer 13

Laterally

Question 14

Is the Extensor Carpi Radialis Brevis an Anatomically Superficial or Deep Muscle of the Posterior Forearm?

Answer 14

Superficial

Question 15

Where does the Extensor Carpi Radialis Brevis Originate from?

Answer 15

Lateral Epicondyle of the Humerus

Question 16

Where does the Extensor Carpi Radialis Brevis attach distally?

Answer 16

1. Metacarpal II
2. Metacarpal III

Question 17

What is the function of the Extensor Carpi Radialis Brevis?

Answer 17

1. Extension of the Wrist
2. Abduction of the Wrist

Question 18

What is the innervation of the Extensor Carpi Radialis Brevis?

Answer 18

Radial Nerve

Question 19

Where are the Extensor Carpi Ulnaris Positioned in the Posterior Forearm?

Answer 19

Medially

Question 20

Is the Extensor Carpi Ulnaris an Anatomically Superficial or Deep Muscle of the Posterior Forearm?

Answer 20

Superficial

Question 21

Where does the Extensor Carpi Ulnaris Originate from?

Answer 21

Lateral Epicondyle of the Humerus

Question 22

Where does the Extensor Carpi Ulnaris attach distally?

Answer 22

Base of Metacarpal V

Question 23

What is the function of the Extensor Carpi Ulnaris?

Answer 23

1. Extension of the Wrist
2. Adduction of the Wrist

Question 24

What is the innervation of the Extensor Carpi Ulnaris?

Answer 24

Radial Nerve

Question 25

Which Muscle of the Anterior Compartment of the Forearm helps with Extensor Carpi Radialis Longus and Brevis with Abduction?

Answer 25

Flexor Carpi Radialis