Class 4

Question 1

What are the muscles of the superficial layer of the posterior forearm

Answer 1

Extensor carpi radialis longus
Extensor carpi radialis brevis
Extensor digitorum
Extensor carpi ulnaris
Anaconeus

Question 2

What are the actions of extensor radialis

Answer 2

Extension and abduction

Radial nerve

Question 3

What are the actions of extensor ulnas

Answer 3

Extension and adduction

Radial nerve

Question 4

What is the action of extensor digitorum

Answer 4

Extend 4 digits at MCP
Spread fingers to see
Passes under extensor retinaculum

Question 5

What are the deeper muscles of the posterior forearm

Answer 5

Supinator - lateral epicondyle - radius v close to bone
Extensor pollicis longus - most medial (lateral on dorsal)
Extensor pollicis brevis
Abductor pollicis longus

Question 6

What innervates the deeper muscles of the posterior forearm

Answer 6

Radial

Question 7

Where is the supinator muscle

Answer 7

Extremely deep

Starts at ulna and envelops proximal shaft of radius

Question 8

What deep muscle is most medial in the anatomical snuff box

Answer 8

EPL

Question 9

What is the action of APL, EPL, and EPB

Answer 9

APL = abduct thumb
EPL = extend all joints
EPB = extend MCP + IMC

Question 10

What bones form the floor of the anatomical snuff box

Answer 10

Scaphoid

Trapezium

Question 11

What lies in the anatomical snuff box

Answer 11

Radius

Question 12

What is the extensor expansion

Answer 12

4 extensor digitorum tendons flattern to form

Question 13

What attaches to extensor expansion

Answer 13

Interossi

Lumbricals

Question 14

What are the muscles of the hand supplied by (+excpetions)

Answer 14

Ulnar
EXCEPT
Thenar muscles (median)
Lumbricals 1+2 (median)

Question 15

What are the thenar muscles on the lateral part of the palm

Answer 15

Flexor polices brevis - most medial
Abductor polices brevis
Opponens pollicis - most lateral - can’t see

Question 16

What are the hypothenar muscles

Answer 16

Flexor digiti minimi
Abductor digiti minimi
Opponens digiti minimi - can’t see

Question 17

What is the adductor pollicis

Answer 17

Very deep muscle to thenar

ADDUCTS thumb

Question 18

What is the action of the liumbricals

Answer 18

Flex MCP

Extend IP

Question 19

Where do lumbricals originate from

Answer 19

FDP

Question 20

What is the action of interossei

Answer 20

Dorsal - abduct

Palmar - adduct

Question 21

What muscles would you see on dorsal and palm

Answer 21

Dorsal interossei on dorsal

Lumbricals on palm

Question 22

What arteries supply the hand

Answer 22

Ulnar and radial
Ulnar = superficial palmar arch
Radial = deep palmar arch

Question 23

What type of joint is the wrist joint

Answer 23

Condyloid
Flexion / extension
Adduction / abduction

Question 24

What bones are involved in the wrist joint

Answer 24

Radius
Articular disk
Proximal row of carpal bones

Question 25

What are the carpal bones

Answer 25

Scaphoid (radial side)
Lunate
Triquetrum
Pisiform

Trapezium
Trapzeiod
Capitte
Hamate

Question 26

What bone is most commonly fractured and at risk of AVN

Answer 26

Scaphoid

Blood supply is distal to proximal

Question 27

What is the 1st CMC joint

Answer 27

Saddle

Question 28

What is the 2-5th CMC joint

Answer 28

Condyloid

Question 29

What are the MCP joints

Answer 29

Condyloid

Question 30

What is the IP joint

Answer 30

Hinge