Elbow (Myology)

Question 1

Biceps Brachii

Answer 1

Action:
Elbow
Flexion
Supination

Origin:
Short head
Apex of coracoid process of the scapula
Long head
Supraglenoid tubercle of the scapula

Insertion:
Radial tuberosity
Forearm fascia

Innervation:
Musculocutaneous nerve C5-7

Question 2

Brachialis

Answer 2

Action:
Elbow flexion

Origin:
Distal anterior aspect of the humerus

Insertion:
Coranoid process
Ulnar tuberosity

Innervation:
Medial aspect
Musculocutaneous nerve
Lateral aspect
Radial nerve

Question 3

Brachioradialis

Answer 3

Action:
Elbow flexion

Origin:
Lateral supracondylar ridge of the humerus
Lateral intermuscular septum

Insertion:
Styloid process of the radius

Innervation:
Radial nerve C5-6

Question 4

Triceps

Answer 4

Action:
*All heads
-Elbow extension
-Humeral stability
*Long head
(Shoulder)
-Adduction
-Extension

Origin:
*Long head
-Infraglenoid tubercle
*Lateral and Medial heads
-Posterior humerus (superior to radial groove)

Insertion:
*All heads
-Posterior surface of ulna
-Capsule of elbow joint
-Antebrachial fascia

Innervation:
*Radial nerve C5-6

Question 5

Supinator

Answer 5

Action:
-Forearm supination

Origin:
(Broad)
-Supraspinator of the forearm
-Supinator crest of the ulna
-Lateral epicondyle of the humerus
-Radial collateral ligament

Insertion:
Proximal 1/3 of radius (distal to radial tuberosity)

Innervation:
Radial nerve C5-6

Question 6

Pronator teres

Answer 6

Action:
-Forearm
Pronation
-Elbow
Flexion

Origin:
*Humeral head
-Superior to medial epicondyle fo the humerus
*Ulnar head
-Medial coronoid process of ulna

Insertion:
Middle of lateral surface of the radius

Innervation:
Median nerve C6-7

Question 7

Pronator Quadratus

Answer 7

Action:
-Forearm pronation

Origin:
-Oblique ridge on anterior aspect of the distal 1/4 of the ulna

Insertion:
-Lateral border of the anterior surface of the distal 1/4 of the ulna

Innervation:
Anterior interosseus nerve C8-T1