Posterior Forearm Muscles

Question 1

Brachioradialis

Answer 1

o: lat supracondylar ridge
i: lat distal radial styloid process
a: flex elbow joint (in neutral)
N: radial N

Question 2

Supinator

Answer 2

o: lateral epicondyle
i: lat 1/3 of prox radius
a: supinates forearm
N: radial N

Question 3

Extensor Carpi Radialis Longus

Answer 3

o: lat supracondylar ridge
i: base of 2nd metacarpal
a: extend & assist in radial deviation @ radoiocarpal
N: radial N

Question 4

Extensor Carpi Radialis Brevis

Answer 4

o: lateral epicondyle
i: base of 3rd metacarpal
a: ext & assist w/ radial deviation @ radiocarpal
N: radial N

Question 5

Extensor Digitorium

Answer 5

o: lat epicondyle
i: extensor expansion phalanges 2-5
a: ext MCP, PIP & DIP of digits 2-5; ext radoiocarpal
N: radial N

Question 6

Extensor Digiti Minimi

Answer 6

o: lateral epicondyle
i: 5th phalanx extensor expansion
a: ext 5th MCP & ext radiocarpal (weak)
N: radial N

Question 7

Extensor Carpi Ulnaris

Answer 7

o: lat epicondyle & post ulna
i: base 5th metacarpal
a: ext & assist with ulnar deviation @ radoiocarpal
N: radial N

Question 8

Abductor Pollicis Longus

Answer 8

o: mid-ulna, radius & IM
i: base of 1st metacarpal
a: abd thumb @ CMC
N: radial N

Question 9

Extensor Pollicis Longus

Answer 9

o: posterior mid ulna & IM
i: base of distal phalanx of thumb
a: ext thumb @ IP, MCP & CMC
N: radial N

Question 10

Extensor Pollicis Brevis

Answer 10

o: post distal radius & IM
i: base of proximal phalanx of thumb
a: ext thumb @ MCP & CMC
N: radial N

Question 11

Extensor Indicis

Answer 11

o: posterior ulna
i: distal phalanx via tendon of extensor digitorum
a: ext. index finger @ DIP, PIP, MCP & ext. wrist
N: radial N