Tutorial 4: Upper Limb, Dry Lab

Question 1

What muscles can extend and either abduct or adduct the hand at the wrist?

Answer 1

Extensor carpi radialis longus
Extensor carpi radialis brevis
Extensor carpi ulnaris

Question 2

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

Answer 2

Extension and abduction of the wrist

Question 3

What are the actions of the extensor carpi ulnaris?

Answer 3

Extension and adduction of the wrist

Question 4

What muscles extend the medial 4 digits?

Answer 4

Extensor digitorum
Extensor indicis
Extensor digiti minimi

Question 5

What are the actions of the extensor digitorum?

Answer 5

Extension of the wrist and fingers

Question 6

What are the attachments of the extensor digitorum?

Answer 6

It arises from the common extensor origin and from the lateral epichondyle

Question 7

What does the tendon of the extensor digitorum pass under when going into the hand?

Answer 7

Extensor retinaculum

Question 8

See pages 71+72 of booklet for diagram of muscles in the posterior compartment of the forearm

Answer 8

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Question 9

What muscles extend or abduct the thumb?

Answer 9

Abductor pollicis longus (APL)
Extensor pollicis brevis (EPB)
Extensor pollicis longus (EPL)

Question 10

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

Answer 10

Radial nerve

Question 11

What is the action of the brachioradialis?

Answer 11

Flexion of the elbow

Question 12

What is the action of the supinator?

Answer 12

Supination of the forearm

Question 13

What completely covers the neck and proximal part of the radius, except on the medial side?

Answer 13

Supinator muscle

Question 14

What nerve supplies the supinator muscle?

Answer 14

Radial nerve

Question 15

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

Answer 15

The cubital fossa

Question 16

What is the name of the deep branch of the radial nerve?

Answer 16

Posterior interosseous nerve

Question 17

Where does the superficial branch of the radial nerve provide with sensory innervation?

Answer 17

Skin on the dorsum of the hand

Question 18

See page 75 of booklet for diagram of the dorsal aspect of the hand

Answer 18

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Question 19

What is the dorsal venous arch?

Answer 19

The origin for the main superficial veins of the upper limb

Question 20

What tendons form the anatomical snuff box?

Answer 20

Tendons of the:
Abductor pollicis longus
Extensor pollicis longus

Question 21

What is the anatomical snuff box?

Answer 21

A shallow depression on the lateral aspect of the wrist when the thumb is fully extended

Question 22

Which 2 carpal bones can be felt in the anatomical snuff box?

Answer 22

Scaphoid

Trapezium

Question 23

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

Answer 23

Radial artery

Question 24

See page 77 of booklet for a diagram of the anatomical snuff box

Answer 24

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Question 25

What type of joint is the carpometacarpal joint?

Answer 25

Saddle synovial

Question 26

Which nerve innervates the extensor pollicis longus, extensor pollicis brevis and abductor pollicis longus muscles?

Answer 26

Radial nerve

Question 27

What is the action of the abductor pollicis longus?

Answer 27

Abduction of the thumb

Question 28

What is the action of the extensor pollicis longus?

Answer 28

Extension of all joints of the thumb; the carpometacarpal, metacarpalphalangeal and the interphalangeal joints

Question 29

What is the action of the extensor pollicis brevis?

Answer 29

Extension of the thumb at the metacarpalphalangeal and carpometacarpal joints

Question 30

What is the extensor expansion?

Answer 30

The four extensor digitorum tendons flatten to form extensor expansions.
Each extensor expansion is a triangular tendinous aponeurosis that wraps around the dorsal and sides of the head of the metacarpal and base of the proximal phalanx

Question 31

See page 79 of the booklet for a diagram of the extensor expansion

Answer 31

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