Muscles of Arm

Question 0

Insertion of Biceps Brachii?

Answer 0

Radial tuberosity and fascia of forearm via bicipital aponeurosis.

Question 1

Biceps Brachii Origin?

Answer 1

Short head: tip of coracoid process of scapula

Long head : supra glenoid tubercle of scapula

Question 2

Innervation of Biceps Brachii?

Answer 2

Musculocutaneous Nerve (C5, C6)

Question 3

Actions 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

Actions of brachialis?

Answer 7

Flexes elbow joint in all positions

Question 8

Coracobrachialis origin?

Answer 8

Tip of coracoid process or scapula

Question 9

Coracobrachialis Insertion?

Answer 9

Middle third of medial surface of humerus

Question 10

Innervation of Coracobrachialis?

Answer 10

Musculocutaneous nerve (C5, C6, C7)

Question 11

Actions of Coracobrachialiss?

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

Actions of Triceps brachii?

Answer 15

Chief extensor of elbow joint; long head extends shoulder joint and resists dislocation of humerus (especially important during abduction)