Muscles of the Arm

Question 0

Corabrachialis

Answer 0

Origin: Coracoid Process
Insertion: Mid-Shaft Humerus on Medial Side
Action: Flexion of Arm at Glenohumeral Joint
Nerve: Musculocutaneous

Question 1

Biceps Brachii

Answer 1

Origin: Coracoid Process (Short Head), Supraglenoid Tubercle of the Scapula (Long Head)
Insertion: Radial Tuberosity and Bicipital Aponeurosis Over Anterior Forearm Muscles
Action: Powerful Flexor of the Arm at the Elbow Joint, Powerful Supinator of Forearm when Flexed, Very Weak Flexor of Arm at Glenohumeral Joint
Nerve: Musculocutaneous

Question 2

Brachialis

Answer 2

Origin: Distal Half of Anterior Humerus
Insertion: Ulnar Tuberosity
Action: Flexes Forearm
Nerve: Musculocutaneous

Question 3

Triceps Brachii

Answer 3

Origin: Infraglenoid Tubercle of the Scapula (Long Head), Posteriolateral Surface of Humerus proximal to Radial Groove (Lateral Head), Posteriomedial Surface of Humerus Distal to Radial Groove (Medial Head)
Insertion: Olecranon of Ulna
Action: Extends Forearm
Nerve: Radial

Question 4

Anconeus

Answer 4

Origin: Lateral Humeral Epicondyle of Humerus
Insertion: Olecranon of Ulna
Action: Extends Forearm, Abducts Ulna during Pronation, Tightens Elbow Joint
Nerve: Radial