Upper Arm

Question 1

What are the muscles in the upper arm?

Answer 1

Biceps brachii, coracobrachialis, brachialis, triceps brachii

Question 2

What are the biceps all innervated by?

Answer 2

Musculocutaneous nerve

Question 3

Origin of biceps brachii

Answer 3

Long head= supraglenoid tubercle of scapula
Short head= coracoid process of scapula

Question 4

Insertion of biceps brachii

Answer 4

Radial tuberosity + fascia of forearm via bicipital aponeurosis

Question 5

Action of biceps brachii

Answer 5

Supination of forearm, flexes arm at elbow and shoulder

Question 6

Origin of coracobrachialis

Answer 6

Coracoid process of scapula

Question 7

Insertion of coracobrachialis

Answer 7

Medial side of humoral shaft

Question 8

Action of coracobrachialis

Answer 8

Flexion of arm at shoulder, weak adduction

Question 9

Origin of brachialis

Answer 9

Medial + lateral surfaces of humeral shaft

Question 10

Insertion of brachialis

Answer 10

Ulnar tuberosity

Question 11

Action of brachialis

Answer 11

Flexion at elbow

Question 12

Origin of triceps brachii

Answer 12

Long head= infraglenoid tubercle
Lateral head= humerus
Medial head= humerus

Question 13

Insertion of triceps brachii

Answer 13

Olecranon on ulna

Question 14

Action of triceps brachii

Answer 14

Extension of arm at elbow

Question 15

Innervation of triceps brachii

Answer 15

Radial nerve