Muscles that are superficial extensors of the forearm/wrist

Question 1

Answer 1

Brachioradialis

Origin: Lateral border of distal end of humerus

Insertion: Superior to styloid process of radius

Action: Flexer forearm at elbow, supinates and pronates forearm

Innervation: Radial nerve

Question 2

Answer 2

Extensor Carpi Radialis Longus

Origin: Lateral supracondylar ridge of humerus

Insertion: 2nd metacarpal

Action: Extends and abducts hand at wrist

Innervation: Radial nerve

Question 3

Answer 3

Extensor Carpi Radialis Brevis

Origin: Lateral epicondyleof humerus

Insertion: 3rd metacarpal

Action: Extends and abducts hand at wrist joint

Innervation: Radial nerve

Question 4

Answer 4

Extensor Carpi Ulnaris

Origin: Lateral epicondyle of humerus and posterior border of ulna

Insertion: 5th metacarpal

Action:

Extends and adducts hand at wrist joint

Innervation: Deep radial nerve