Muscles of the Arm

Question 1

biceps brachii origin

Answer 1

short head: tip of the coracoid process of the scapula

long head: supraglenoid tubercle of the scapula

Question 2

biceps brachii insertion

Answer 2

tuberosity of the radius, fascia of forearm via bicipital aponeurosis

Question 3

biceps brachii action

Answer 3

supinates the forearm

flexes forearm when in supine position

the long head also flexes arm

Question 4

biceps brachii nerve

Answer 4

musculocutaneous nerve (C5,6,7)

Question 5

biceps brachii artery

Answer 5

brachial artery

Question 6

brachialis origin

Answer 6

distal half of anterior surface of humerus

Question 7

brachialis insertion

Answer 7

coronoid process and tuberosity of ulna

Question 8

brachialis action

Answer 8

flexes the forearm

Question 9

brachialis nerve

Answer 9

musculocutaneous nerve (C5,6,7)
radial nerve (C5,7)

Question 10

brachialis artery

Answer 10

brachial artery
radial recurrent artery

Question 11

coracobrachialis origin

Answer 11

coracoid process of the scapula

Question 12

coracobrachialis insertion

Answer 12

middle third of medial surface of humerus

Question 13

coracobrachialis action

Answer 13

flexes and adducts the arm
helps prevent anterior dislocation of the shoulder

Question 14

coracobrachialis nerve

Answer 14

musculocutaneous nerve (C5,6,7)

Question 15

coracobrachialis artery

Answer 15

brachial artery

Question 16

aconeus origin

Answer 16

lateral epicondyle of the humerus

Question 17

aconeus insertion

Answer 17

lateral side of the olecranon and posterior proximal ulna

Question 18

aconeus action

Answer 18

extends the forearm at the elbow joint, abduct ulna during pronation

Question 19

aconeus nerve

Answer 19

radial nerve (C7, 8, T1)

Question 20

aconeus artery

Answer 20

recurrent interosseous artery from posterior interosseous artery

Question 21

triceps brachii origin

Answer 21

long head: infraglenoid tubercle of scapula

lateral head: posterior humerus superior to radial groove

medial head: posterior humerus inferior to radial groove

Question 22

triceps brachii insertion

Answer 22

olecranon process of the ulna

Question 23

triceps brachii action

Answer 23

all muscle heads extend the forearm at elbow joint; the long head also adducts arm

Question 24

triceps brachii nerve

Answer 24

radial nerve (C6,7,8)

Question 25

triceps brachii artery

Answer 25

deep brachial (profunda brachii) artery