Muscles of the Finger Joints

Question 1

What are the 5 major muscles in this group?

Answer 1

1. Flexor Digitorum Superficialis
2. Flexor Digitorum Profundus
3. Flexor Pollicis Longus
4. Extensor Digitorum
5. Extensor Digiti Minimi

Question 2

What is the origin, insertion and actions of Flexor Digitorum Superficialis?

Answer 2

O : Medial epicondyle of the humerus via the common flexor belly / tendon, Anterior Ulna and Radius
I : Anterior surfaces of fingers 2-5
A :
1. Flexes fingers 2-5 at the MCP and PIP joint
2. Flexes the hand at the wrist joint

Question 3

What is the origin, insertion and action of Flexor Digitorum Profundus?

Answer 3

O : Medial and anterior ulna
I : Anterior surfaces of fingers 2-5
A : Flexes fingers 2-5 at MCP, PIP and DIP joints

Question 4

What is the origin, insertion and actions of Flexor Pollicis Longus?

Answer 4

O : Anterior surface of the radius
I : Thumb
A :
1. Flexes the thumb at the CMC, MCP and IP joints
2. Flexes the hand at the wrist joint

Question 5

What is the origin, insertion and actions of Extensor Digitorum?

Answer 5

O : Lateral epicondyle of the humerus via common extensor tendon / belly
I : Phalanges of fingers 2-5
A :
1. Extends fingers 2-5 at the MCP, PIP and DIP joints
2. Extends the hand at the wrist joint

Question 6

What is the origin, insertion and actions of Extensor Digiti Minimi?

Answer 6

O : Lateral epicondyle of the humerus via the common extensor belly / tendon
I : Phalanges of the little finger
A :
1. Extends the little finger at the MCP, PIP and DIP joints
2. Extends the hand at the wrist joint