Elbow + Forearm Muscles

Question 1

Biceps barchii

Answer 1

origin =
short head: coracoid process
long head: supraglenoid tubercle of scapula
insertion = tuberosity of radius
action = flexion at elbow; flexion at shoulder; supination of arm
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, radial nerve

Question 3

Brachioradialis

Answer 3

origin = lateral epicondyle of humerus
insertion = lateral aspect of styloid process at radius
action = flexion at elbow
innervation = radial nerve

Question 4

Triceps

Answer 4

origin =
lateral head: superior lateral margin of 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