Muscles of the Finger Joints : Deep Distal 4 Group

Question 1

What are the muscles of the deep distal 4 group?

Answer 1

1. Abductor pollicis longus
2. Extensor pollicis brevis
3. Extensor pollicis longus
4. Extensor indicis

Question 2

What is the origin, insertion and action of Abductor Pollicis Longus?

Answer 2

O : Posterior radius and ulna
I : Thumb
A :
1. Abducts the thumb at the CMC joint
2. Extends the thumb at the CMC joint

Question 3

What is the origin, insertion and action of Extensor Pollicis Brevis?

Answer 3

O : Posterior radius
I : Thumb
A :
1. Extends the thumb at the CMC and MCP joints
2. Abducts the thumb at the CMC joint

Question 4

What is the origin, insertion and action of Extensor Pollicis Longus?

Answer 4

O : Posterior Ulna
I : Thumb
A : Extends the thumb at CMC, MCP and IP joints

Question 5

What is the origin, insertion and action of Extensor Indicis?

Answer 5

O : Posterior Ulna
I : Index Finger
A :
1. Extends the index finer at MCP, PIP and DIP joints
2. Extends the hand at the wrist joint