Muscles of the Arm

Question 0

Insertion of biceps brachii

Answer 0

Tuberosity of radius and fascia of forearm via bicipital aponeurosis

Question 1

Origin of biceps brachii

Answer 1

Short head : Tip of coracoid process of scapula

Long head : Supraglenoid tubercle of scapula

Question 2

Innervation of biceps brachii

Answer 2

Musculocutaneous nerve (C5, C6)

Question 3

Action of biceps brachii

Answer 3

Supinates forearm and, when it is supinated, flexes elbow joint
Flexes shoulder joint
Short head resists dislocation of shoulder

Question 4

Origin of brachialis

Answer 4

Distal half of anterior surface of humerus

Question 5

Insertion of Brachialis

Answer 5

Coronoid process and tuberosity of ulna

Question 6

Innervation of brachialis

Answer 6

Musculocutaneous nerve (C5, C6)

Question 7

Action of brachialis

Answer 7

Flexes elbow joint in all positions

Question 8

Origin of coracobrachialis

Answer 8

Tip of coracoid process of scapula

Question 9

Insertion of coracobrachialis

Answer 9

Middle third of medial surface of humerus

Question 10

Innervation of coracobrachialis

Answer 10

Musculocutaneous nerve (C5, C6, C7)

Question 11

Action of coracobrachialis

Answer 11

Helps flex and adduct shoulder joint

Resists dislocation of shoulder

Question 12

Origin of triceps brachii

Answer 12

Long head : Infraglenoid tubercle of scapula
Lateral head : Posterior surface of humerus, superior to radial groove
Medial head : Posterior surface of humerus, inferior to radial groove

Question 13

Insertion of triceps brachii

Answer 13

Proximal end of olecranon of ulna and fascia of forearm

Question 14

Innervation of triceps brachii

Answer 14

Radial nerve (C6, C7, C8)

Question 15

Action of triceps brachii

Answer 15

Chief extensor of elbow joint

Long head extends shoulder joint and resists dislocation of humerus

Question 16

Origin of anconeus

Answer 16

Lateral epicondyle of humerus

Question 17

Insertion of anconeus

Answer 17

Lateral surface of olecranon

Superior part of posterior surface of ulna

Question 18

Innervation of anconeus

Answer 18

Radial nerve (C7, C8, T1)

Question 19

Action of anconeus

Answer 19

Assists triceps in extending elbow joint
Stabilizes elbow joint
Abducts ulna during pronation

Question 20

Bicipital aponeurosis

Answer 20

Triangular membranous band that runs from biceps tendon and merges with antebrachial fascia

Question 21

Subtendinous olecranon bursa

Answer 21

Friction reducing, between triceps tendon and olecranon