Muscles of the Forearm - Extensor Group / Superficial Layer

Question 1

Brachioradialis

Answer 1

O: lateral supracondylar ridge of humerus + intermuscular septum of arm

I: lateral side of distal end of radius

A: flexion of forearm

In: radial nerve

Question 2

Extensor Carpi Radialis Longus

Answer 2

O: lateral supracondylar ridge and lateral epicondyle of humerus + intermuscular septum

I: base of second metacarpal

A: extension and abduction (radial deviation) of hand

In: radial nerve

Question 3

Extensor Carpi Radialis Brevis

Answer 3

O: lateral epicondyle of humerus + intermuscular septum + antebrachial fascia

I: base of third metacarpal

A: extension of hand

In: radial nerve

Question 4

Extensor Digitorum

Answer 4

O: lateral epicondyle of humerus + intermuscular septum + antebrachial fascia

I: middle and distal phalanges of each of the four fingers

A: extension of each of the four middle fingers

In: radial nerve

Question 5

Extensor Digiti Minimi

Answer 5

O: lateral epicondyle of humerus

I: middle and distal phalanges of little finger

A: extension and abduction of little finger

In: radial nerve

Question 6

Extensor Carpi Ulnaris

Answer 6

O: lateral epicondyle of humerus + proximal part of ulna

I: base of fifth metacarpal

A: extension and adduction (ulnar deviation) of hand

In: radial nerve