Arm and elbow attachments

Question 1

Biceps brachii attachments and actions

Answer 1

Short head: coracoid process

Long head: supraglenoid tubercle

Distal: radial tuberosity, deep fascia of forearm via bicipital aponeurosis

Actions:
flexion and supination of the forearm
short head: resists shoulder dislocation

Question 2

Brachialis attachments and actions

Answer 2

Distal half of anterior surface of humerus
coronoid process and tuberosity of ulna

Actions:
(main) flexion of the forearm in all positions

Question 3

Corocobrachialis attachments and actions

Answer 3

Corocoid process
Middle third of medial humerus

Actions:
adduction of the humerus
flexion of the humerus
resists dislocation of shoulder

Question 4

Triceps brachii attachments and actions

Answer 4

Long head: infraglenoid tubercle

Medial head: posterior surface of humerus inferior to radial groove

Lateral head: posterior surface of humerus superior to radial groove

Distal: Proximal surface of olecranon and fascia of forearm

Actions:
extension of the forearm
long head may also extend and adduct the humerus
resists dislocation of the humerus

Question 5

Anconeus attachments and actions

Answer 5

lateral epicondyle to lateral side of olecranon and superior part of posterior ulna

Actions:
extension of forearm at elbow