O: Lateral epicondyle of humerus

I: Distal shaft of radius

A: Flexion of elbow, pronation from supination and supination from pronation of the forearm.

N: Radial n. (C5-6)

O: Lateral epicondyle of the humerus

I: Dorsum of base of 2nd metacarpal

A: Extension and abduction of wrist

N: Radial n.

O: Lateral epicondyle of the humerus

I: Dorsum of base of 3rd metacarpal

A: Extension and abduction of the wrist

N: Deep radial n.

O: Lateral epicondyle of the humerus

I: Extensor hoods of proximal phalanges of ulnar 4 digits

A: Extension of the MP and wrist joints

N: Deep radial n.

O: Ulnar aspect of ED

I: Extensor hoods of proximal phalanx of 5th digit

A: Extension of the MP and wrist joints

N: Deep radial n.

O: Lateral epicondyle of the humerus and posterior border of ulna

I: Dorsum of base of 5th metacarpal

A: Extension and adduction of wrist

N: Deep radial n.

O: Lateral epicondle of humerus and lateral ulna superiorly

I: Anterior surface of radius

A: Supination of forearm

N: Deep radial n.

O: Posterior surface of ulna, radius, and IO membrane

I: Anterior surface of base of 1st metacarpal

A: Abduction, extension, lateral rotation of 1st metacarpal

N: Deep radial n.

O: Posterior surface of radius and IO membrane

I: Base of proximal phalanx of thumb

A: Extension of proximal phalanx and metacarpal of thumb abduction of the wrist

N: Deep radial n.

O: Posterior surface of the ulna and IO membrane

I: Dorsum of distal phalanx of thumb

A: Extension of distal phalanx of thumb (and proximal joints)

N: Deep radial n.

O: Posterior surface of the ulna

I: With tendon of ED into extensor hood of index finger

A: Extension of all joints of index finger, abduction

N: Deep radial n.