Superficial Layer of Posterior Forearm Muscles

Question 0

Extensor Carpi Radialis Longus

Answer 0

Origin: Lateral supra-epicondylar ridge of humerus

Insertion: Dorsal aspect of base of 2nd metacarpal

Innervation: Radial Nerve (C6, C7)

Question 1

Brachioradialis

Answer 1

Origin: Proximal 2/3 of lateral supra-epicondylar ridge of humerus

Insertion: Lateral surface of distal end of radius proximal to styloid process

Innervation: Radial Nerve (C5, C6, C7)

Question 2

Extensor Carpi Radialis Brevis

Answer 2

Origin: Lateral epicondyle of humerus

Insertion: Dorsal aspect of base of 3rd metacarpal

Innervation: Deep branch of radial nerve (C7, C8)

Question 3

Extensor Digitorum

Answer 3

Origin: Lateral epicondyle of humerus

Insertion: Extensor expansions of medial four fingers

Innervation: Posterior Interosseous Nerve (C7, C8) deep branch of radial nerve

Question 4

Extensor Digiti Minimi

Answer 4

Origin: Lateral epicondyle of the humerus

Insertion: Extensor expansion of 5th finger

Innervation: Posterior Interosseous Nerve (C7, C8), deep branch of radial nerve

Question 5

Extensor Carpi Ulnaris

Answer 5

Origin: Lateral epicondyle of humerus; posterior border of ulna via a shared aponeurosis

Insertion: Dorsal aspect of base of 5th metacarpal

Innervation: Posterior Interosseous Nerve (C7, C8), deep branch of radial nerve