Upper limb 4

Question 1

3 functional groups of the posterior forearm

Answer 1

muscles that extend and abduct/adduct wrist
muscles that extend medial 4 digits
muscles that extend or abduct the thumb

Question 2

3 muscles which extend and abduct/adduct wrist

Answer 2

extensor carpi radialis brevis
extensor carpi radialis longus
extensor carpi ulnaris

Question 3

action of extensor carpi radialis longus and brevis

Answer 3

extend and abduct wrist

Question 4

What muscle helps the extensor carpi radialis longus and brevis abduct the wrist?

Answer 4

flexor carpi radialis

Question 5

3 muscles that extend the medial 4 digits

Answer 5

extensor digitorum
extensor digiti minimi
extensor indicis

Question 6

Action, origin and insertion of extensor digitorum

Answer 6

extend the wrist and digits
common extensor origin - lateral epicondyle
ends in tendon which goes under extensor retinaculum

Question 7

Muscles that extend or abduct thumb

Answer 7

extensor pollicus longus
extensor pollicus brevis
abductor pollicus longus

Question 8

What nerve innervates all muscles of posterior compartment of the forearm?

Answer 8

radial

Question 9

What does the supinator muscle cover?

Answer 9

neck and proximal part of the shaft of radius, covering it completely except on medial side

Question 10

Main action and the innervation of supinator muscle

Answer 10

supinate forearm

radial nerve

Question 11

Where does the radial nerve divide into superficial and deep branches?

Answer 11

cubital fossa

Question 12

Branches of radial nerve

Answer 12

deep = posterior interosseous nerve 
superficial = sensory - skin on dorsum of hand

Question 13

Dorsal venous arch

Answer 13

main superficial veins of the upper limb originate in subcutaneous tissue on dorsum of hand

Question 14

Synovial cyst/ganglion

Answer 14

non tender cystic growths on dorsum of hand

communicate with synovial sheaths covering tendons

Question 15

Colles fracture

Answer 15

distal radius - dinner fork deformity

Question 16

Thumb joint type

Answer 16

synovial saddle

Question 17

What tendons bound anatomical snuffbox laterally?

Answer 17

Abductor pollicus longus

extensor pollicus brevis

Question 18

What tendon bounds anatomical snuffbox medially?

Answer 18

extensor pollicus longus

Question 19

Anatomical snuffbox

Answer 19

shallow depression on lateral aspect of wrist when thumb fully extended

Question 20

2 carpal bones in anatomical snuffbox

Answer 20

scaphoid and trapezium

Question 21

Which artery lies on floor of anatomical snuffbox?

Answer 21

radial

Question 22

What nerve innervates EPL, EPB and APL?

Answer 22

radial nerve - posterior interosseous

Question 23

Main action of EPL and EPB

Answer 23

extend the thumb and wrist joint

Question 24

APL main action

Answer 24

abduct thumb at wrist joint

Question 25

What forms the extensor expansions?

Answer 25

4 tendons of extensor digitorum

Question 26

Where are extensor expansions?

Answer 26

wrap around dorsum and sides of head of metacarpal and base of proximal phalanx`

Question 27

Muscles attaching to extensor expansion

Answer 27

interossei, lumbricals, extensor digitorum

FDS and FDP