Extensors of the forearm

Question 1

Superficial Extensor Muscle Group

Answer 1

Brachioradialis
Extensor Carpi Radialis Longus
Extensor Carpi Radialis Brevis
Extensor Digitorum
Extensor Digiti Minimi
Extensor Carpi Ulnaris
Anconeous

Question 2

Origin of the Brachioradialis

Answer 2

Upper lateral supracondylar ridge of the humerus

Question 3

Insertion of the Brachioradialis

Answer 3

Lateral radius above styloid process

Question 4

innervation of any extensor muscle

Answer 4

radial nerve

Question 5

Action of the Brachioradialis

Answer 5

• Flexion of the elbow when in a neutral position
• Supination when the arm is pronated
• Pronation when the arm is supinated

Question 6

Origin of the Extensor Carpi Radialis Longus

Answer 6

Lower lateral supracondylar ridge of the humerus

Question 7

Insertion of the Extensor Carpi Radialis Longus

Answer 7

Base of the 2nd metacarpal

Question 8

Action of the Extensor Carpi Radialis Longus

Answer 8

Wrist extension

-Radial deviation (with the flexor carpi radialis)

Question 9

Origin of the Extensor Carpi Radialis Brevis

Answer 9

Lateral epicondyle of the humerus

Question 10

Insertion of the Extensor Carpi Radialis Brevis

Answer 10

Base of 3rd metacarpal

Question 11

Action of the Extensor Carpi Radialis Brevis

Answer 11

Wrist extension

Question 12

Origin of the Extensor Digitorum

Answer 12

Lateral epicondyle of humerus

Question 13

Insertion of the Extensor Digitorum

Answer 13

Extensor hood

Question 14

Action of the Extensor Digitorum

Answer 14

-Extension of all finger joints

Question 15

Origin of the Extensor Digiti Minimi

Answer 15

Lateral epicondyle

Question 16

Insertion of the Extensor Digitorum Minimi

Answer 16

Extensor hood of 5th finger

Question 17

Action of the Extensor Digiti Minimi

Answer 17

Extension of 5th finger

Question 18

Origin of the Extensor Carpi Ulnaris

Answer 18

Lateral epicondyle of humerus

Question 19

Insertion of the Extensor Carpi Ulnaris

Answer 19

Base of 5th metacarpal

Question 20

Deep Extensor Muscle Group

Answer 20

Supinator
Abductor Pollicis Longus
Extensor Pollicis Brevis
Extensor Pollicis Longus
Extensor Indicis

Question 21

Origin of the Supinator

Answer 21

• Lateral epicondyle of humerus
• Annular ligament
• Superior crest of the ulna

Question 22

Insertion of the Supinator

Answer 22

Upper radius

Question 23

Action of the Supinator

Answer 23

Supinates the forearm

Question 24

Origin of the Abductor Pollicis Longus

Answer 24

• Posterior ulna
• Posterior radius
• Interosseous membrane

Question 25

Insertion of the Abductor Pollicis Longus

Answer 25

Base of the 1st metacarpal

Question 26

Action of Abductor Pollicis Longus

Answer 26

Abducts the thumb

Question 27

Origin of the Extensor Pollicis Brevis

Answer 27

- Distal radius | - Interosseous membrane

Question 28

Insertion of the Extensor Pollicis Brevis

Answer 28

Base of the proximal phalanx of the thumb

Question 29

Action of the Extensor Pollicis Brevis

Answer 29

Extends MCP joint of thumb

Question 30

Origin of the Extensor Pollicis Longus

Answer 30

- Posterior ulna | - Interosseous membrane

Question 31

Insertion of the Extensor Pollicis Longus

Answer 31

Base of the distal phalanx of the thumb

Question 32

Action of the Extensor Pollicis Longus

Answer 32

Extends the thumb

Question 33

Origin of the Extensor Indicis

Answer 33

Posterior distal ulna

Question 34

Insertion of the Extensor Indicis

Answer 34

Extensor hood on index finger

Question 35

Action of the Extensor Indicis

Answer 35

Extension of index finger

Question 36

carpi means

Answer 36

wrist

Question 37

pollicis means

Answer 37

thumb

Question 38

indices

Answer 38

index finger

Question 39

3 radial extensor muscles

Answer 39

brachioradialis extensor carpi radialis longus extensor carpi radialis brevis

Question 40

3 digit extensor muscles

Answer 40

extensor digitorum extensor indicis extensor digiti minimi

Question 41

3 pollicis extensor muscles

Answer 41

extensor pollicis longus extensor pollicis brevis abductor pollicis longus

Question 42

tendons and blood supply of anatomical snuff box

Answer 42

tendons - extensor pollicis longus, brevis, abductor pollicis longus blood supply - cephalic vein, radial artery

Question 43

3 other extensor muscles

Answer 43

extensor carpi ulnaris anconeus supinator