Muscles of Arm

Question 0

Where does the biceps brachii insert?

Answer 0

Radial tuberosity and fascia of forearm via bicipital aponeurosis

Question 1

What is the origin of the biceps brachii?

Answer 1

Short head originates on the tip of the coracoid process of scapula
Long head originates on the supraglenoid tubercle of scapula

Question 2

What is the innervation of the biceps brachii?

Answer 2

Musculocutaneous nerve (C5, C6)

Question 3

What action does the biceps brachii perform?

Answer 3

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

Question 4

What is the origin of the brachialis?

Answer 4

Distal half of anterior surface of humerus

Question 5

Where does the brachialis insert?

Answer 5

Coronoid process and ulnar tuberosity

Question 6

What is the innervation of the brachialis?

Answer 6

Musculocutaneous nerve (C5, C6)

Question 7

What action does the brachialis perform?

Answer 7

Flexes elbow joint in all positions

Question 8

What is the origin of the coracobrachialis?

Answer 8

Tip of coracoid process of scapula

Question 9

Where does the coracobrachialis insert?

Answer 9

Middle third of medial surface of humerus

Question 10

What is the innervation of the coracobrachialis?

Answer 10

Musculocutaneous nerve (C5, C6, C7)

Question 11

What action does the coracobrachialis perform?

Answer 11

Helps flex and adduct shoulder joint, resists dislocation of the shoulder

Question 12

What is the origin of the triceps brachii?

Answer 12

Long head originates on the infraglenoid tubercle of humerus
Lateral head originates on the posterior surface of humerus, superior to radial groove
Medial head originates on posterior surface of humerus, inferior to radial groove

Question 13

Where does the triceps brachii insert?

Answer 13

Proximal end of olecranon of ulna and fascia of forearm

Question 14

What is the innervation of the triceps brachii?

Answer 14

Radial nerve (C6, C7, C8)

Question 15

What action does the triceps brachii perform?

Answer 15

Chief extensor of elbow joint, long head extends shoulder jointand resists dislocation of humerus (important during abduction)

Question 16

What is the origin of the anconeus?

Answer 16

Lateral epicondyle of humerus

Question 17

Where does the anconeus insert?

Answer 17

Lateral surface of olecranon and superior part of posterior surface of ulna

Question 18

What is the innervation of the anconeus?

Answer 18

Radial nerve (C7, C8, T1)

Question 19

What action does the anconeus perform?

Answer 19

Assists triceps in extending elbow joint, stabilizes elbow joint, abducts ulna during pronation