5 - Posterior Muscles of the Forearm

Question 1

Name the seven superficial muscles in the posterior compartment of the forearm

Answer 1

brachioradialis, extensor carpi radialis longus, extensor carpi radialis brevis, extensor digitorum, extensor digiti minimi, extensor carpi ulnaris and aconeus

Question 2

What are the muscles in the posterior compartment of the forearm also known as?

Answer 2

The extensor muscles

Question 3

What occurs in all superficial posterior muscles bar two?

Answer 3

Continue as tendons into the hand

Question 4

What are the two muscle in the superficial posterior compartment of the forearm with tendons which do not extend into the hand?

Answer 4

The brachioraialis and aconeus

Question 5

What is A?

Answer 5

The brachioradialis

Question 6

What name can all superficial posterior muscles be known as, other than the aconeous and brachioradialis

Answer 6

Extrinsic hand muscles

Question 7

What type of movement is the brachioradialis responsible for? Why is this weird?

Answer 7

FlexionOrigin and innervation are characteristic of extensor, and lies in extensor compartment

Question 8

In the distal forearm, what can be found below the brachioradialis?

Answer 8

The radial artery and nerves

Question 9

What is the brachioradialis most visible?

Answer 9

When half pronated and fleing at the elbow against resistance

Question 10

What is the action of the brachioradialis?

Answer 10

Flexion at the elbow

Question 11

What is the innervation of the brachioradialis?

Answer 11

Radial nerve

Question 12

What are B and C?

Answer 12

Extensor Carpi Radialis Longus and Brevis

Question 13

What is the aciton of the extensor carp radialis longus and brevis?

Answer 13

Extension and abduction of the wrist

Question 14

What is the innervation of every muscle in this deck?

Answer 14

Radial nerve, so yeh.

Question 15

What are the nerve roots of the radial nerve?

Answer 15

C5-T1

Question 16

What is D?

Answer 16

The Aconeus

Question 17

What is the aconeus blended with?

Answer 17

Fibres of the triceps brachii

Question 18

What is the action of the aconeus?

Answer 18

Moves the ulna during pronation and extends at the elbow joint

Question 19

What is E?

Answer 19

Extensor Carpi Ulnaris

Question 20

What is the action of the extensor carpi ulnaris?

Answer 20

Extension and adduction of wrist

Question 21

What is F?

Answer 21

Extensor Digitorum

Question 22

What is significant about the extensor digitorum (think about the name)

Answer 22

Main extensor of the fingers, makes up most of the posterior surface of the forearm

Question 23

What are the actions of the extensore digitorum?

Answer 23

Extends medial four finger at metacarpal and IP joints

Question 24

What is G?

Answer 24

Extensor Digiti Minimi

Question 25

What is the action of the Extensor Digiti Minimi

Answer 25

Extends the little finger and contributes to extension at the wrist

Question 26

What occurs if there is injury to the radial nerve?

Answer 26

Wrist dropRadial nerve innervates the muscles that extend at the wrist and are paralysed. The wrist undergoes unopposed flexion and wristdrop results

Question 27

Name five deep muscles of the posteior forearm

Answer 27

the supinator, abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus and extensor indicis

Question 28

What is A?

Answer 28

Supinator

Question 29

What does the supinator form the floor of?

Answer 29

The cubital fossa

Question 30

What is the action of the supinator

Answer 30

Supinates the forearm

Question 31

What is B?

Answer 31

Abductor pollicis longus

Question 32

What border does the abductor pollicus longus contribute to?

Answer 32

The lateral border of the anatomical snuff box

Question 33

What is the action of the abductor pollicis longus?

Answer 33

Abducts the thumb

Question 34

What is C?

Answer 34

Extensor indicis

Question 35

What is the action of the extensor indicis?

Answer 35

Extends the index finger

Question 36

What is D?

Answer 36

Extensor Pollicis Brevis

Question 37

What is the action of the extensor pollicis brevis?

Answer 37

Extends the MCP and carpometacarpal joints of the thumb

Question 38

What border does extensor pollicis brevis contribute to?

Answer 38

The lateral border of the anatomical snuff box

Question 39

What is E?

Answer 39

Extensor Pollicis Longus

Question 40

What is the action of the abductor pollicis longus?

Answer 40

Abducts the thumb