Elbow Myology

Question 1

Supinator

Answer 1

Originates: humeral head- inf lat epicondyle, radial collateral ligament, annular ligament
Ulnar head- supinator crest, ulnar fossa

Inserts: ant/post/lateral aspect of radius

Supinates forearm

Posterior interosseous branch of radial nerveC5,6

Question 2

Biceps Brachii

Answer 2

Originates: long head- supraglenoid tubercle, bicipital groove
Short head- apex of corona I’d process

Inserts: posterior radial tuberosity, deep fascia attaches to bicipital apneurosis

flexes elbow, supinates forearm

Musculocutaneuous nerve C5,6

Question 3

Brachialis

Answer 3

Originates: lower 2/3 anterior humerus, adjacent septa

Inserts: inferior coronoid process, ulnar tuberosity

Flexes elbow

Musculocutaneous nerve C5,6

Question 4

Brachioradialis

Answer 4

Originates: upper 2/3/ anteriolateral supracondylar ridge, adjacent septa

Inserts: lateral surface of radius

Flexes elbow (mid-range)

Radial nerve C5,6

Question 5

Pronator Teres

Answer 5

Originates: common flexor origin, med epicondyle humerus, pronator ridge of ulna

Inserts: lateral mid surface of radius

Pronates forearm, weak elbow flexor

Median nerve C6,7

Question 6

Pronator quadratus

Answer 6

Originates: lower 1/4 anterior ulna

Inserts: lower 1/4 anterior radius

Pronates forearm

Anterior interosseous branch of median nerve C8,T1

Question 7

Triceps brachii

Answer 7

Originates: long head- infraglenoid tubercle, adjacent glenoid labrum
Lateral head- posterior humerus upper/lat to spiral groove
Medial head- posterior humerus lower/med to spiral groove

Inserts: posterior surface of olecranon of ulna, adjacent deep fascia

Extends elbow

Radial nerve C6,7,8

Question 8

Anconeus

Answer 8

Originates: posterior lateral epicondyle of humerus

Inserts: lateral olecranon, posterior ulna

Assists triceps in extension

Radial nerve C7,8