Posterior Forearm

Question 1

What nerve innervates the brachioradialis?

Answer 1

radial nerve

Question 2

What is the only posterior compartment forearm muscle that flexes the forearm?

Answer 2

Brachioradialis

Question 3

How many muscles lay in the posterior forearm and in how many layers?

Answer 3

12 muscles

2 layers

Question 4

What are the generalised functions of the posterior forearm compartment?

Answer 4

Extension and supination

Question 5

All muscles in the posterior forearm are innervated by …

Answer 5

The radial nerve

Question 6

Name the superficial muscles of the posterior forearm

Answer 6

Brachioradialis 
Extensor carpi radialis longus
Extensor carpi radialis brevis 
Extensor digitorum
Extensor carpi ulnaris 
Anconeus

Question 7

Name the deep muscles of the posterior forearm

Answer 7

Supinator
Abductor pollicis longus 
Extensor pollicis longus
Extensor indicis 
Extensor digiti minimi
Extensor pollicis brevis

Question 8

What forms the medial border of the anatomical snuffbox?

Answer 8

Tendon of extensor pollicis longus

Question 9

What forms the lateral border of the anatomical snuffbox?

Answer 9

Tendon of abductor pollicis longus

Question 10

What passes through the anatomical snuffbox?

Answer 10

radial artery

Question 11

What is the origin of brachioradialis?

Answer 11

Lateral supra epicondylar ridge of humerus

Question 12

What is the insertion of brachioradialis?

Answer 12

Distal radius

Question 13

What is the action of brachioradialis?

Answer 13

Flex elbow

Question 14

What is the origin of ECRL?

Answer 14

Lateral supracondylar ridge of humerus

Question 15

What is the origin of ECRB?

Answer 15

Lateral epicondyle of humerus

Question 16

What is the attachment for both ECR muscles?

Answer 16

Metacarpals II and III

Question 17

What are the actions of the ECR muscles?

Answer 17

Extend and abduct wrist

Question 18

What is the origin of extensor digitorum?

Answer 18

Lateral epicondyle humerus

Question 19

What is the insertion of extensor digitorum?

Answer 19

Extensor hood of each finger

Question 20

What is the action of extensor digitorum?

Answer 20

Extends medial 4 digits at MCP and IP joints

Question 21

What is the origin of extensor digiti minimi?

Answer 21

Lateral epicondyle humerus

Question 22

What is the insertion of extensor digiti minimi?

Answer 22

Extensor hood of little finger

Question 23

What is the action of EDM?

Answer 23

Extends little finger and contributes to extension of wrist

Question 24

What is the origin of ECU?

Answer 24

Lateral epicondyle humerus

Question 25

What is the insertion of ECU?

Answer 25

Base of metacarpal V

Question 26

What is the action of ECU?

Answer 26

Extends and adducts wrist

Question 27

What is the origin of anconeus?

Answer 27

Lateral epicondyle humerus

Question 28

What is the insertion of anconeus?

Answer 28

Olecranon

Question 29

What is the action of anconeus?

Answer 29

Move ulna during pronation

Extend elbow

Question 30

What is the medical term for Tennis elbow?

Answer 30

Lateral epicondylitis

Question 31

What is the insertion of supinator?

Answer 31

Radius

Question 32

What is the origin of APL?

Answer 32

Posterior radius and ulna

Question 33

What is the insertion of APL?

Answer 33

Lateral side of base of metacarpal I

Question 34

What is the origin of EPB?

Answer 34

Posterior radius

Question 35

What is the insertion of EPB?

Answer 35

Base of proximal phalanx of thumb

Question 36

What is the action of EPB?

Answer 36

Extends at MCP and CMC joints of thumb

Question 37

What is the origin of EPL?

Answer 37

Posterior ulna

Question 38

What is the insertion of EPL?

Answer 38

Distal phalanx of thumb

Question 39

What is the action of EPL?

Answer 39

Extends all joints of thumb

Question 40

What is the origin of EIP?

Answer 40

Posterior ulna

Question 41

What is the insertion of EIP?

Answer 41

Extensor hood of index finger