Posterior Forearm

Question 1

Anconeus
(O, I, A)

Answer 1

O: Lateral Epicondyle of Humerus
I: Posterior proximal Ulna
A: Extension of forearm at elbow joint

Question 2

Extensor Carpi Radialis Longus
(O, I, A, N)

Answer 2

O: Lateral supracondylar ridge of Humerus
I: Base of metacarpal 2
A:
-Extension of hand at wrist joint
-Radial deviation of hand at wrist joint
N: Radial

Question 3

Extensor Carpi Radialis Brevis
(O, I, A, N)

Answer 3

O: Lateral Epicondyle of humerus via CET
I: Base of metacarpal 3
A:
-Extension of hand at wrist joint
-Radial deviation of hand at wrist joint

Question 4

Extensor Digitorum
(O, I, A, N)

Answer 4

O: Lateral Epicondyle of humerus via CET
I: Middle and Distal phalanx of digits 2-5 via dorsal digital expansion
A:
-Extension of digits 2-5 at MCP, PIP, and DIP joints
-Extension of hand at wrist joint
N: Radial

Question 5

Extensor Digiti Minimi
(O, I, A)

Answer 5

O: Lateral Epicondyle of Humerus via CET
I: Proximal and distal phalanx of digit 5 via dorsal digital expansion
A:
-Extension of digit 5 at MCP, PIP, DIP joints
-Extension of hand at wrist joint

Question 6

Extensor Carpi Ulnaris
(O, I, A, N)

Answer 6

O:
-Lateral Epicondyle of Humerus via CET
-Posterior middle Ulna
I: Base of metacarpal 5
A:
-Extension of hand at wrist joint
-Ulnar deviation of hand at wrist joint
N: Radial

Question 7

Supinator
(O, I, A)

Answer 7

O: Lateral epicondyle of humerus Supinator crest of Ulna
I: Proximal radius
A: Supination of forearm at radioulnar joint

Question 8

Abductor Pollicis Longus
(O, I, A, N)

Answer 8

O: Middle 1/3 of Ulna, Radius, and Interosseus membrane
I: Base of metacarpal #1
A: Abduction of thumb at CMC joint
N: Radial

Question 9

Extensor Pollicis Brevis
(O, I, A, N)

Answer 9

O: Distal 1/3 of Radius and Interosseus Membrane
I: Proximal phalanx of thumb
A: Extension of thumb at CMC and MCP joint
N: Radial

Question 10

Extensor Pollicis Longus
(O, I, A, N)

Answer 10

O: Middle 1/3 of Ulna and Interosseus membrane
I: Distal phalanx of thumb via dorsal digital expansion
A: Extension of thumb at CMC, MCP and IP joints
N: Radial

Question 11

Extensor Indicis
(O, I, A)

Answer 11

O: Distal 1/3 of Ulna and Interosseus membrane
I: Middle and Distal phalanx of digit 2 via dorsal digital expansion
A:
-Extension of digit 2 at MCP, PIP, DIP joints
-Extension of hand at wrist joint