the forearm and Hand part 3

Question 1

what muscles compose the superficial latyer of the posterior compartment of the forearm

Answer 1

• extensor carpi radialis longus
• extensor carpi radialis brevis
• extensor digitorum
• extensory carpi ulnaris
• extensor digiti minimi

Question 2

what is the common insertion of the posterior compartment of the forearm except for extensor carpi radialis longus?

Answer 2

lateral epicondyle

Question 3

extensor carpi radialis longus
Origin
insertion
function

Answer 3

Origin: lateral supracondylar ridge of the humerus

insertion: base of metacarpal 2
function: abduction (RD) and extension of the hand at the wrist

Question 4

extensor carpi radialis brevis
insertion
function

Answer 4

insertion: base of metacarpal 3
function: abduction (RD) and extension of the hand at the wrist

Question 5

extensor digitorum
insertion
function

Answer 5

insertion: splits into 4 tendons that insert on the extensor hood of digits 2-5
function: extension of the wrist, MCP, PIP and DIP

Question 6

extensory carpi ulnaris
insertion
function

Answer 6

insertion: base of metacarpal 5
function: extension and adduction (UD) of hand at wrist

Question 7

extensor digiti minimi
insertion
function:
location:

Answer 7

insertion: extensor expansion hood of digit 5
function: acessory extension of digit 5
location: between extensor carpi ulnaris and extensor digitorum

Question 8

Where is the extensor expansion hood located

Answer 8

on the back of the finger, its the dorsal aspect of the phalanges

Question 9

what is tennis elbow?
what is its clinical name?
cause?

Answer 9

it is the inflammation and pain around the lateral epicondyle
clinical name? lateral epicondylitis
cause? over use of wrist extensors

Question 10

what is golfer’s elbow?
what is its clinical name?
cause?

Answer 10

inflammation and pain around the medial epicondyle
medial epicondylitis
caused by the overuse or hyperextension of wrist flexors

Question 11

what method can be used to prevent either golfers/ tennis elbow?

Answer 11

stretching of the tendons, hence doing movements in the opposite direction

Question 12

what are the muscles that compose the deep layer of the posterior compartments of the forearm?

Answer 12

• extensor pollicis longus
• extensor pollicis brevis
• extensor indicis
• abductors pollicis longus

Question 13

what is the common origin of the muscles of the deep layer of the posterior compartment of the forearm?

Answer 13

posterolateral ulna and interosseous membrane

Question 14

extensor pollicis longus

insertion

Answer 14

insertion: distal phalynx of digit 1

Question 15

extensor pollicis brevis

insertion

Answer 15

insertion: proximal phalynx of digit 1

Question 16

extensor indicis
insertion
function

Answer 16

insertion: distal phalynx of digit 2
function: accessory extension of index

Question 17

abductors pollicis longus
insertion
function

Answer 17

insertion: base of metacarpal 1

Question 18

what is the brevis sandwich composed of?

Answer 18

one brevis tendon between 2 longus
-medial 2 are extensorys
-lateral is an abductor
(abductor policis longus, extensor policis brevis, extensor policis longus)

Question 19

how is the anatomical snuff box created?

Answer 19

by the muscles forming the brevis sandwich

Question 20

what are the tendons that can be observed on the dorsal side of our hands?

Answer 20

these are the tendons of extensor digitorum

Question 21

how many tendons do digits 2 and 5 have?

digits 1, 3,4?

Answer 21

digits 2 and 5 have 2 tendons each the others only have one

Question 22

synovial sheaths are located on which tendons?

Answer 22

extensor tendons

Question 23

what provides blood to the antero-postero-medial muscles of the forearm?

Answer 23

ulnar A

Question 24

what does the common interosseous artery split into?

Answer 24

into the posterior and anterior interosseous A.

Question 25

what provides blood to the antero-postero-lateral muscles of the forearm?

Answer 25

the radial A

Question 26

what does the posterior interosseous A supply?

Answer 26

it supplies muscles of the deep posterior compartment

Question 27

what does the anterior interosseous A supply?

Answer 27

supplies the deep muscles of the anterior compartment

Question 28

relative to the thumb where does the radial A travel?

Answer 28

posterior to the thumb and within the anatomical snuff box (overtop)

Question 29

what does the median nerve innervate in the forearm?

Answer 29

anterior comaprtments of the forearm except for the medial half of FDS and flexor carpi ulnaris

Question 30

where does the median nerve travel in the forearm?

Answer 30

in between FDS and FDP

Question 31

what muscles does the anterior interosseous N innervate?

Answer 31

the deep muscles which include the lateral half od FDP, flexor policis longus and pronator quadratus

Question 32

what muscles are innervated by the ulnar nerve?

Answer 32

flexor carpi ulnaris and the medial half of FDP

Question 33

the anterior interossoeous N is a branch of which major nerve?

Answer 33

of the median nerve

Question 34

what does the deep radial nerve innervate in the forearm?

Answer 34

it provides the motor innervation to the extensor/posterior compartment of the forearm

Question 35

what muscle is pierced by the deep radial N?

Answer 35

supinator

Question 36

what nerve travels deep to the brachioradialis?

Answer 36

the superficial radial nerve

Question 37

which muscles of the forearm are not innervated by the deep radial nerve, but by the radial N instead?

Answer 37

• extensor carpi radialis

- brachioradialis

Question 38

wrist drop represents dammage to what nerve?

Answer 38

dammage to the radial nerve as extension cannot be accomplished

Question 39

what myotome allows for forearm suppination?

trick?

Answer 39

C5-C6 i flick my wrist

Question 40

what myotome allows for forearm pronation?

Answer 40

C7-C8 the time is late

Question 41

what myotome allows for wrist flexion/extension?

Answer 41

C6-C7 fly up to heaven