Muscles of the elbow and radioulnar joints

Question 1

Biceps brachii - elbow and radioulnar joints

Answer 1

Origin - Scapula

Insertion - radial tuberosity

Action - Flexion of forearm at elbow;
supination of radius at radioulnar joints (best supinator);
flexion at shoulder joint

Question 2

Brachialis - elbow

Answer 2

Origin - Anterior distal half of humerus

Insertion - ulna tuberosity

Action - flexion at elbow (excellent!)

Question 3

Brachioradioalis - elbow

Answer 3

Origin - lateral supracondylar ridge of humerus

Insertion - styloid process of radius

Action - flexion of forearm at elbow
- supination and pronation of the radius at radioulnar joints

Question 4

triceps brachii - elbow

Answer 4

Origin - one head on scapula; two heads on humerus

Insertion - olecranon process of ulna

Action - extension of forearm at elbow
- extension at shoulder joint

Question 5

pronator teres - elbow and radioulnar joints

Answer 5

Origin - medial epicondyle of humerus

Insertion - radius

Action - pronation of the radius at the radioulnar joints
- flexion at elbow

Question 6

pronator quadratus - radioulnar joints

Answer 6

Origin - distal ulna

Insertion - distal radius

Action - pronation of radius at radioulnar joints

Question 7

supinator - radioulnar joints

Answer 7

Origin - lateral epicondyle of humerus

Insertion - radius

Action - supinates the radius at the radioulnar joints

Question 8

The elbow is what kind of joint and allows what kind of movement?

Answer 8

hinge type synovial joint

allows flexion and extension