Muscles of the Wrist Joint : Extensor Group

Question 1

What are the muscles of the extensor group?

Answer 1

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

Question 2

What is the origin, insertion and actions of Extensor Carpi Radialis Longus?

Answer 2

O : Lateral Supracondylar Ridge of the humerus
I : Posterior hand on the radial side
A :
1. Extends the hand hand at the wrist joint
2. Radially deviates the hand at the wrist joint

Question 3

What is the origin, insertion and actions of Extensor Carpi Radialis Brevis?

Answer 3

O : Lateral epicondyle pf the humerus via the common extensor tendon
I : Posterior hand on the radial side
A :
1. Extends the hand at the wrist joint
2. Radially deviates the hand at the wrist joint

Question 4

What is the origin, insertion and actions of Extensor Carpi Ulnaris?

Answer 4

O : Lateral epicondyle of the humerus via the common extensor tendon and ulna
I : Posterior hand on the ulnar side
A :
1. Extends the hand at the wrist joint
2. Ulnar deviates the hand at the wrist