Muscles of the Elbow and Radioulnar Joint : Elbow

Question 1

What are the muscles of the elbow?

Answer 1

1. Biceps Brachii
2. Brachialis
3. Brachioradialis
4. Triceps Brachii
5. Anconeus

Question 2

What is the origin, insertion and actions of Biceps Brachii?

Answer 2

O (Long Head) : Supraglenoid tubercle of the scapula
O (Short Head) : Coracoid process of the scapula
I : Radial tuberosity
A :
1. Flexes the forearm at the elbow joint
2. Supinates the forearm at the RU joints
3. Flexes the arm at the GH joint

Question 3

What is the origin, insertion and actions of Brachialis?

Answer 3

O : Distal half of the anterior shaft of the humerus
I : Ulnar tuberosity
A : Flexes the forearm at the elbow joint

Question 4

What is the origin, insertion and actions of Brachioradialis?

Answer 4

O : Lateral supracondylar ridge of the humerus
I : Styloid process of the radius
A :
1. Flexes the forearm at the elbow joints
2. Supinates the forearm at the RU joints
3. Pronates the forearm at the RU joints

Question 5

What is the origin, insertion and actions of Triceps Brachii?

Answer 5

O (Long Head) : Infraglenoid tubercle of the scapula
O (Lateral and Medial heads) : Posterior shaft of humerus
I : Olecranon process of the ulna
A :
1. Extends the forearm at the elbow joint
2. Extends the arm at the GH joint

Question 5

What is the origin, insertion and actions of Anconeus?

Answer 5

O : Lateral epicondyle of the humerus
I : Posterior proximal ulna
A : Extends the forearm at the elbow joint