Dorsal Forearm And Hand

Question 0

Name the carpal bones

Answer 0

Scaphoid, Lunate, Triquetrum, Pisiform, Trapezium, Trapezoid, Capitate, Hamate

Question 1

What artery would be damaged with a fracture above the epicondyles?

Answer 1

Brachial artery

Question 2

What type of joint is the DRUJ?

Answer 2

Synovial pivot

Supination and pronation

Question 3

What is the role of the TFCC in the DRUJ?

Answer 3

Binds ends of radius and ulna together

Question 4

What is the functional importance of the DRUJ?

Answer 4

Helps transmit loads from hand to forearm

Question 5

Superficial (6) muscles of posterior forearm

Answer 5

Brachioradialis
ECRL
ECRB
Extensor digitorum
Extensor digiti minimi
ECU

Question 6

Deep muscles (5) of posterior forearm

Answer 6

Supinator
APL
EPL
EPB
Extensor indicis

Question 7

1st posterior compartment

Answer 7

EPB (extensor pollicis brevis)

APL (abductor pollicis longus)

Question 8

2nd posterior compartment

Answer 8

ECRL (extensor carpi radialis longus)

ECRB (extensor carpi radialis brevis)

Question 9

3rd posterior compartment

Answer 9

EPL (extensor pollicis longus)

Question 10

4th posterior compartment

Answer 10

Extensor digitorum

Question 11

5th posterior compartment

Answer 11

EDM (extensor digiti minimi)

Question 12

6th posterior compartment

Answer 12

ECU (extensor carpi ulnaris)

Question 13

Contents of snuffbox

Answer 13

EPL
EPB
Scaphoid
Radial artery
Superficial radial nerve

Question 14

Which two muscles extend wrist on radial side?

Answer 14

ECRL and ECRB

Question 15

Which two muscles both extend and abduct thumb?

Answer 15

APL and EPB

Question 16

What muscles are involved with lateral epicondylosis (tennis elbow)?

Answer 16

Extensors attached to lateral epicondyle

Specifically ECRB

Question 17

What is the cause and effect of tennis elbow?

Answer 17

Cause: overuse injury
Effects: pain with wrist extension, pain on lateral side of elbow, weak grip, weakness in scapular muscles

Question 18

What nerve is damaged with Wrist Drop and what is a possible cause of this?

Answer 18

Radial nerve

Spiral fracture of humerus

Question 19

What is DeQuervain’s Syndrome and it’s symptoms?

Answer 19

Inflammation of structures in 1st posterior compartment (EPB and APL)
Stretching causes increased pain

Question 20

Who does DeQuervain’s syndrome usually effect? How is it tested?

Answer 20

New Mothers and day care workers
(Hand extended and abducted when holding babies)

Will hurt when wrapping fingers around thumb and then flexing toward ulna

Question 21

What is the functional purpose of the dorsal tubercle of the radius?

Answer 21

Allows passage of tendons of the forearm

Serves as trochlear pulley for tendon of long extensor of thumb

Question 22

What is the functional purpose of the extensor retinaculum?

Answer 22

Prevents bow stringing of tendons when hand is extended

Question 23

What is the purpose of synovial tendon sheaths?

Answer 23

Covers tendons on dorsal wrist to Reduce friction for tendons when traversing attachment of extensor retinaculum

Question 24

What are intertendinous connections in the fingers and what do they restrict?

Answer 24

Link adjacent tendons to MCP joints Restrict independent extension of fingers *why one finger can't stay flexed as others are extended

Question 25

What separates the cavity of DRUJ from the cavity of the wrist joint?

Answer 25

Articular disc

Question 26

What is the purpose of the sacciform recess in the DRUJ?

Answer 26

Extension of synovial membrane that accommodates twisting of capsule during pron/supin

Question 27

What muscles are involved with supination of the DRUJ?

Answer 27

Supinator (no resistance) Biceps brachii (resistance) EPL and ECRL (some assistance)

Question 28

What muscles are involved with pronation of the DRUJ?

Answer 28

``` Pronator quadratus (primary) Pronator teres (secondary) FCR, palmaris longus, brachioradialis (some assistance)...when 1/2 pronated ```