Posterior Forearm

Question 1

What fascia separates the superficial and deep compartments of the posterior compartment of the forearm?

Answer 1

Antebrachial fasica

Question 2

How many muscles are in the superficial compartment?

Answer 2

7 - just be aware of the brachioradialis

Question 3

What is the common origin for most of the muscles in the superior compartment?

Answer 3

Common extensor tendon of lateral epicondyle of humerus

Question 4

What is the common innervation for the muscles in the superior compartment?

Answer 4

Radial nerve

Question 5

How many muscles are in the deep compartment?

Answer 5

5

Question 6

What is the common origin of the muscles in the deep compartment?

Answer 6

Shafts of radius and ulnar and interosseus membrane

Question 7

What are the main actions of the deep compartment?

Answer 7

Extension and abduction of the thumb (pollicis muscles)

Supination of forearm

Question 8

What is the innervation of the deep compartment?

Answer 8

Deep branch of the radial nerve - posterior interosseus nerve