Muscles of the Arm

Question 1

Biceps Brachii

Answer 1

Origin: Long head- Supraglenoid tubercle of Scapula. Short head- Coracoid process of scapula.

Insertion: Radial tuberosity

Actions: Elbow flexion, Forearm supination, Flexion of the shoulder

Question 1

Brachialis

Answer 1

Origin: Anterior shaft of humerus.

Insertion: Coronoid process of ulna

Actions: Elbow flexion

Question 2

Brachioradialis

Answer 2

Origin: Lateral distal humerus

Insertion: Styloid process of radius

Actions: Elbow flexion

Question 3

Triceps Brachii

Answer 3

Origin:
Long head- Infraglenoid tubercle of scapula.
Medial head- Posterior medial humerus.
Lateral- Posterior lateral humerus

Insertion: Olecranon process of ulna

Actions:
Extension of elbow
Extension of arm at shoulder (Long head only)

Question 4

Anconeus

Answer 4

Origin: Lateral epicondyle of humerus

Insertions:
Olecranon
Shaft of Ulna

Actions: Elbow extension

Question 5

What are the superficial forearm muscles?

Answer 5

Pronator teres, Flexor carpi radialis, palmaris longus, flexor carpi ulnaris

Question 6

What do the superficial forearm muscles do?

Answer 6

Action:
Elbow flexion
Elbow extension
PT- Pronates forearm (no wrist flexion)

Question 7

Where do the superficial forearm muscles originate?

Answer 7

The Common Flexor Origin or the CFO is the Medial epicondyle of the humerus

Question 8

Where does the pronator teres insert?

Answer 8

Lateral Radius

Question 9

Where does the Flexor carpi radialis insert?

Answer 9

Metacarpals

Question 10

Where does the Palmaris longus insert?

Answer 10

Palmar aponeurosis

Question 11

Where does the flexor carpi ulnaris insert?

Answer 11

Pisiform; Metacarpals

Question 12

What is the intermediate forearm muscle?

Answer 12

The Flexor Digitorum Superficialis (FDS)

Question 13

Where does the flexor digitorum superficialis originate?

Answer 13

The medial epicondyle of the humerus, ulna, and radius

Question 14

Where does the flexor digitorum superficialis insert?

Answer 14

Middle phalanges of digits 2-5

Question 15

What does the flexor digitorum superficialis do?

Answer 15

Flexion of the elbow, wrist and fingers

Question 16

What are the deep anterior forearm muscles?

Answer 16

Flexor digitorum profundus (FDP)
Flexor pollicis longus (FPL)
Pronator Quadratus (PQ)
Supinator

Question 17

Flexor Digitorum Profundus

Answer 17

Origin: Ulna and interosseus membrane

Insertion: Distal phalanges (digits 2-5)

Action: Flexion of wrist and fingers

Question 18

Flexor Pollicis Longus

Answer 18

Origin: Radius and Interosseus membrane

Insertion: Distal phalanx of thumb

Action: Flexion of wrist and thumb

Question 19

Pronator Quadratus

Answer 19

Origin: Ulna

Insertion: Radius

Action: Forearm pronation

Question 20

What are the superficial posterior forearm muscles?

Answer 20

Extensor carpi radialis longus
Extensor carpi ulnaris
Extensor digitourm
Extensor carpi radialis brevis

Question 21

Where do the superficial posterior forearm muscles originate?

Answer 21

The Common Extensor Origin (CEO) or the Lateral Epicondyle of the Humerus

Question 22

Where do the superficial posterior forearm muscles insert?

Answer 22

Insertion:
Extensor Digitorum- Distal Phalanx of digits 2-5
Others- Metacarpals

Question 23

What do the superficial posterior forearm muscles do?

Answer 23

Actions:
All- extension of wrist and elbow
Extensor Digitorum- Finger Extension of digits 2-5

Question 24

What are the deep posterior forearm muscles?

Answer 24

Supinator, Abductor pollicis longus, Extensor pollicis longus, Extensor indicis, Extensor pollicis brevis

Question 25

Where do the deep posterior forearm muscles originate?

Answer 25

Radius, Ulna and Interosseous membrane Supinator: CEO (Lateral epicondyle of the humerus) and the Ulna

Question 26

Where do the deep posterior forearm muscles insert?

Answer 26

The thumb and first metacarpal Supinator: Radius

Question 27

What do the deep posterior forearm muscles do?

Answer 27

Actions: Wrist extension Finger/thumb extension Abductor pollicis longus- Thumb abduction Supinator- Forearm supination

Question 28

To flex the distal interphalangeal joint of the four medial digits of the hand, which muscle from the ones listed must be working?

Answer 28

The Flexor Digitorum Profundus