Elbow/Radioulnar Joint

Question 1

Biceps Brachii (Long Head)

Answer 1

O: supraglenoid tubercle of scapula
I: radial tuberosity and bicipital aponeurosis into fascia of forearm
A: flexion and supination of forearm; flexion of arm
N: musculocutaneous nerve

Question 2

Brachialis

Answer 2

O: lower half of anterior surface of humerus; intermuscular septa
I: ulnar tuberosity
A: flexion of forearm
N: musculocutaneous nerve

Question 3

Brachioradialis

Answer 3

O: lateral supracondylar ridge of humerus
I: lateral surface of distal end of radius
A: flexion of forearm
N: radial nerve

Question 4

Triceps Brachii (lateral head)

Answer 4

O: posterior surface of humerus above and lateral to groove of radial nerve
I: proximal end of olecranon
A: extension of forearm
N: radial nerve

Question 5

Anconeus

Answer 5

O: lateral distal surface of the humerus
I: lateral side of olecranon of ulna
A: extension fo forearm; stabalize elbow joint against flexion or pronation-supination
N: radial nerve

Question 6

Supinator

Answer 6

O: posterolateral surface of ulna below raidal notch; lateral epicondyle; radial collateral and annular ligaments
I: lateral and adjacent posterior and anterior aspects of proximal shaft of radius
A: supination of forearm (and hand)
N: radial nerve

Question 7

Pronator Teres (two heads)

Answer 7

O: medial epicondyle of humerus; coronoid process of ulna
I: lateral surface of midshaft of radius
A: pronation of forearm (and hand)
N: median nerve

Question 8

Pronator Quadratus

Answer 8

O: distal corridor of ulna
I: distal part of radius
A: pronation of forearm (and hand)
N: median nerve

Question 9

Triceps Brachii (Medial Head)

Answer 9

O: posterior surface of humerus below and medial to groove of radial nerve
I: proximal end of olecranon
A: extension of forearm
N: radial nerve