Myology of the elbow and forearm

Question 1

Origin of biceps brachii?

Answer 1

Long head: Supraglenoid tubercle of scapula
Short head: Apex of coracoid process of scapula

Question 2

Insertion of biceps brachii?

Answer 2

Two bellies fuse into a common tendon and inserts into posterior part of radial tuberosity

Question 3

Action of biceps brachii?

Answer 3

Flexes and supinates forearm

Question 4

Innervation of biceps brachii?

Answer 4

Musculocutaneous nerve (C5-C6)

Question 5

Origin of triceps brachii?

Answer 5

Long head: Infraglenoid tubercle of scapula and adjacent glenoid labrum
Lateral head: Posterior part of the humerus (superior and lateral to spiral groove)
Medial head: posterior part of humerus (inferior and medial to spiral groove)

Question 6

Insertion of triceps brachii?

Answer 6

Posterior surface olecranon of ulna and adjacent deep fascia of forearm

Question 7

Action of triceps brachii?

Answer 7

Extensor of forearm

Question 8

Innervation of triceps brachii?

Answer 8

Radial nerve (C6-C8)

Question 9

Origin of brachialis?

Answer 9

Distal 2/3’s of the humerus and adjacent septa

Question 10

Insertion of brachialis?

Answer 10

Inferior part of the coronoid process and ulnar tuberosity

Question 11

Action of brachialis?

Answer 11

Main flexor of the elbow

Question 12

Innervation of brachialis?

Answer 12

Musculocutaneous nerve (C5-C6)

Question 13

Origin of brachioradialis?

Answer 13

Upper 2/3’s anterior lateral supracondylar ridge of humerus and adjacent septum

Question 14

Insertion of brachioradialis?

Answer 14

Lateral surface of the radius

Question 15

Action of brachioradialis?

Answer 15

Flexes the forearm at mid flexion

Question 16

Innervation of brachioradialis?

Answer 16

Radial nerve (C5-C6)

Question 17

Origin of the anconeus?

Answer 17

Posterior surface of the lateral epicondyle of humerus

Question 18

Insertion of anconeus?

Answer 18

Lateral surface of the olecranon and posterior surface of the ulna

Question 19

Action of anconeus?

Answer 19

Assists the triceps in elbow extension

Question 20

Innervation of anconeus?

Answer 20

Radial nerve (C7-C8)

Question 21

Origin of the supinator?

Answer 21

Lateral epicondyle of the humerus, radial collateral ligament, radial annular ligament

Question 22

Insertion of the supinator?

Answer 22

Lateral, posterior, and anterior surface of the upper third of radius

Question 23

Action of the supinator?

Answer 23

Supinates the forearm

Question 24

Innervation of the supinator?

Answer 24

Posterior interosseous branch of the radial nerve (C5-C6)

Question 25

Origin of the pronator teres?

Answer 25

Common flexor origin, medial epicondyle of the humerus, pronator ridge of the ulna

Question 26

Insertion of pronator teres?

Answer 26

Middle lateral surface of the radius

Question 27

Action of pronator teres?

Answer 27

Pronates the arm and weakly flexes the elbow

Question 28

Innervation of pronator teres?

Answer 28

Median nerve (C6-C7)

Question 29

Origin of pronator quadratus?

Answer 29

Lower quarter anterior surface of ulna

Question 30

Insertion of pronator quadratus?

Answer 30

Lower quarter anterior surface of radius

Question 31

Action of pronator quadratus?

Answer 31

Pronates the arm

Question 32

Innervation of pronator quadratus?

Answer 32

Anterior interosseous branch, median nerve (C8-T1)