Muscles of the Elbow Joint and Forearm

Question 1

action of the brachialis

Answer 1

elbow flexion

Question 2

origin of brachialis

Answer 2

distal half of humerus, anterior surface

Question 3

insertion of brachialis

Answer 3

coronoid process and ulnar tuberosity of the ulna

Question 4

action of biceps brachii

Answer 4

elbow flexion, forearm supination

Question 5

origin of biceps brachia

Answer 5

long head: supraglenoid tubercle of scapula

short head: coracoid process of scapula

Question 6

insertion of biceps brachii

Answer 6

radial tuberosity of radius

Question 7

action of brachioradialis muscle

Answer 7

elbow flexion

Question 8

origin of brachioradialis

Answer 8

lateral supracondylar ridge on the humerus

Question 9

insertion of brachioradialis

Answer 9

styloid process of the radius

Question 10

action of triceps

Answer 10

elbow extension

Question 11

origin of the triceps

Answer 11

long head: infraglenoid tubercle of scapula

lateral head: inferior to greater tubercle on posterior humerus

Question 12

insertion of triceps

Answer 12

olecranon process of ulna

Question 13

action of anconeus

Answer 13

not a prime mover in any joint action, assists in elbow extension

Question 14

origin of anconeus

Answer 14

lateral epicondyle of humerus

Question 15

insertion of anconeus

Answer 15

lateral and inferior to olecranon process of ulna

Question 16

action of pronator teres

Answer 16

forearm pronation, assistive in elbow flexion

Question 17

origin of pronator teres

Answer 17

medial epicondyle of humerus and coronoid process of ulna

Question 18

insertion of pronator teres

Answer 18

lateral aspect of radius at its midpoint

Question 19

action of pronator quadrates muscle

Answer 19

forearm pronation

Question 20

origin o pronator quadratus muscle

Answer 20

distal 1/4 of ulna

Question 21

insertion of pronator quadratus

Answer 21

distal 1/4 of radius

Question 22

action of supinator

Answer 22

forearm supination

Question 23

origin of supinator

Answer 23

lateral epicondyle of humerus and adjacent ulna

Question 24

insertion of supinator

Answer 24

anterior surface of the proximal radius