Upper Limb 4 - Posterior Forearm, Neurovascular, Hand & Thumb

Question 1

What are the actions of the muscles within the posterior compartment of the forearm?

Answer 1

Extension

Abduction

Adduction

Question 2

What are the 3 key muscles of the posterior forearm?

Answer 2

Extensor carpi radialis longus

Extensor carpi radialis brevis

Extensor carpi ulnaris

Question 3

What are the actions of extensor carpi radialis longus and brevis on the wrist joint?

Answer 3

Extension

Abduction

Question 4

What are the muscles that extend the digits?

Answer 4

Extensor digiti minimi

Extensor indicis

Extensor digitorum

Question 5

Where does the extensor digitorum muscle originate from?

Answer 5

Lateral epicondyle

Question 6

Under which structure does the tendon of extensor digitorum pass?

Answer 6

Extensor retinaculum

Question 7

What muscles are involved in extension and abduction of the thumb?

Answer 7

Abductor pollicus longus

Extensor pollicus longus

Extensor pollicus brevis

Question 8

Which nerve innervates all the muscles of the posterior compartment of the arm?

Answer 8

Radial nerve

Question 9

Describe the location of the supinator muscle?

Answer 9

Around the shaft and neck of the proximal part of the radius, except of the medial side

Question 10

What is the action of the supinator muscle?

Answer 10

It supinates the forearm

Question 11

What is the nerve supply of the supinator muscle?

Answer 11

Radial nerve

Question 12

Which 2 bones are located beneath the anatomical snuff box?

Answer 12

Scaphoid

Trapezium

Question 13

Which artery lies on the floor of the anatomical snuff box?

Answer 13

Radial artery

Question 14

Which nerve innervates all the muscles of the thumb found in the posterior compartment of the forearm?

Answer 14

Radial nerve

Question 15

What is the main action of the EPB, EPL, APL muscles?

Answer 15

EPB - Extends at metacarpophalangeal joints

EPL - Extends all joints of the thumb

APL - Abducts the thumb

Question 16

What action do the Dorsal Interossei muscles perform on the fingers?

Answer 16

Abduct the fingers at the Metcarpophalangeal

Question 17

What action do the palmar interossei muscles perform on the fingers?

Answer 17

Adduct the fingers at the metacarpophalangeal joints