Elbow and Forearm Origins and Inseertions

Question 1

Biceps Brachii

Answer 1

Origin:
Short head- coracoid process
long head- supraglenoid tubercle

Insertion: radial tuberosity & biceps aponeurosis

Motions:
Elbow Flexion
Rorearm Supination
Shoulder Flexion

Nerve: musculocutaneous nerve

Question 2

Brachialis

Answer 2

Origins: Distal half of humerus

Insertions: Coronoid process of ulna

Action:
Elbow Flexion

Nerve:
musculocutaneous and small branch of radial

Question 3

Brachioradialis

Answer 3

Origins: Lateral supracondylar ridge of humerus

Insertions: Lateral side of distal end of radius

Action:
elbow flexion

Nerve: Radial

Question 4

Triceps Brachii

Answer 4

Origins:
Long Head: Infraglenoid tubercle of the scapula
Lateral Head: Posterior surface of humerus below (proximal half) and lateral to groove radial nerve
Medial Head: Posterior surface of humerus below (distal half) and medial..

Insertions: Olecranon process of the ulna

Action:
All heads: Extend the elbow
Long head: Extend shoulder and Adduct the shoulder

Nerve: Radial

Question 5

Anconeus

Answer 5

Origins: Lateral epicondyle

Insertions: Olecranon process

Action: Elbow extension

Nerve: Radial

Question 6

Pronator Teres

Answer 6

Origins: Medial epicondyle of humerus and Coronoid process of ulna

Insertions: Lateral medial radius

Action: Forearm pronation
Assist to flex elbow

Nerve: Median Nerve

Question 7

Pronator Quadratus

Answer 7

Origins: Distal part of Ulna (4th)

Insertions: Distal part of radius

Action: Forearm pronation

Nerve: Median

Question 8

Supinator

Answer 8

Origins: posterolateral surface of ulna below radial notch; lateral epicondyle

Insertions: Proximal shaft of radius

Action: Forearm supination

Nerve: radial nerve