Muscles in the posterior compartment of the forearm

Question 1

What are all the posterior compartment muscles of the forearm innervated by?

Answer 1

radial nerve

Question 2

What are the two layers of muscle innervated by? (deep and superficial)

Answer 2

layer of fascia

Question 3

What are the 7 muscles of the superficial layer called?

Answer 3

brachioradialis, extensor carpi radialis longus, extensor carpi brevis, extensor digitorum communis, extensor digiti minimi, extensor carpi ulnaris, anconeus

Question 4

What four muscles share a common tendinous origin at the lateral epicondyle?

Answer 4

extensor carpi radialis brevis, extensor digitorum, extensor carpi lunaris and extensor digiti minimi

Question 5

What type of muscle is brachioradialis?

Answer 5

paradoxical muscle- its origin and innervation are characteristic of an extensor muscles but it is actually a flexor at the elbow.

Question 6

origin of the brachioradialis

Answer 6

proximal aspect of the lateral supracondylar ridge of the humerus

Question 7

insertion of the brachioradialis

Answer 7

distal end of the radius, just before the radial styloid process

Question 8

function of the brachioradialis

Answer 8

flexes at the elbow

Question 9

origin of the extensor carpi radialis longus and brevis

Answer 9

ECRL originates from the supracondylar ridge

ECRB originates from the lateral epicondyle

Question 10

insertion of extensor carpi radialis longus and brevis

Answer 10

metacarpal bones 2 and 3

Question 11

function of the extensor carpi radialis longus and brevis

Answer 11

extends and abducts the wrist