Forearm & Elbow Muscle

Question 1

Biceps brachii

Answer 1

ORIGIN: short head- coracoid process; long head- supraglenoid tubercle of scapula

INSERTION: tuberosity of radius

ACTION: flexion at elbow and shoulder; supination

INNERVATION: musculocutaneous nerve

Question 2

Brachialis

Answer 2

ORIGIN: anterior/distal surface of humerus

INSERTION: tuberosity of ulna

ACTION: flexion at elbow

INNERVATION: musculocutaneous nerve and radial nerve

Question 3

Brachioradialis

Answer 3

ORIGIN: lateral epicondyle of humerus

INSERTION: lateral aspect of styloid process of radius

ACTION: flexion at elbow

INNERVATION: radial nerve

Question 4

Triceps(long head, lateral head, medial head)

Answer 4

ORIGIN: Lateral head – superior, lateral margin on humerus

Long head – infraglenoid tubercle of scapula

Medial head – posterior surface of humerus

INSERTION: olecranon of ulna

ACTION: extension at elbow

INNERVATION: radial nerve

Question 5

Pronator Teres

Answer 5

ORIGIN: medial epicondyle of humerus

INSERTION: mid-lateral surface of radius

ACTION: pronation

INNERVATION: median nerve

Question 6

Supinator

Answer 6

ORIGIN: lateral epicondyle of humerus

INSERTION: anterolateral surface of radius

ACTION: supination

INNERVATION: deep radial nerve