L12: Wrist

Question 1

list the bones of the wrist

Answer 1

scaphoid
lunate
triquetral
pisiform
trapezium
trapezoid
capitate
hamate

Question 2

lateral to medial proximal row of carpals

Answer 2

scaphoid
lunate
triquetral
pisiform

Question 3

lateral to medial distal row of carpals

Answer 3

trapezium
trapezoid
capitate
hamate

Question 4

forms the snuff box floor

Answer 4

scaphoid

Question 5

scaphoid

Answer 5

1. snuff box floor
2. most commonly fractured carpal
3. fractures compromise radial artery in box
4. articulates w/ radius

Question 6

lunate

Answer 6

articulates w/ radius

in proximal row of carpals

Question 7

triquetral

Answer 7

1. articulates w/ ulna during extreme ulnar deviation

Question 8

pisiform

Answer 8

1. sesamoid bone

2. formed w/in tendon of flexor carpi ulnaris

Question 9

the entire wrist complex is

Answer 9

enclosed in a common synovial membrane

articulations are plane joints
perform gliding motions

Question 10

osteology of wrist and hand

Answer 10

8 carpals
5 metacarpals
14 phalanges

Question 11

radiocarpal joint

Answer 11

1. condyloid synovial jt
2. 2 degrees of freedom
3. articular surfaces – radius to carpals

Question 12

carpals involvement in radiocarpal joint

Answer 12

1. scaphoid - convex
2. lunate - convex
3. distal radius - 2 concave fossa
4. triquetral - convex - only involved during extreme deviation

Question 13

articular nerve branches

Answer 13

any nerve that crosses a joint will send fibers into the joint to relay joint information to the brain

Question 14

radiocarpal joint ligaments

Answer 14

1. radial collateral lig
2. ulnar collateral lig
3. dorsal radiocarpal lig
4. palmar radiocarpal lig

Question 15

radiocarpal joint - related mvts

Answer 15

1. some flex/ext

2. ulnar deviation

Question 16

radiocarpal joint - arteries

Answer 16

1. articular arteries – arising from dorsal and palmar carpal arches

Question 17

radiocarpal joint - nerves

Answer 17

1. anterior interosseous
2. posterior interosseous
3. dorsal and deep branches of ulnar n.

Question 18

what nerve do the ant/post interosseous nerves arise from?

Answer 18

median nerve

Question 19

midcarpal joint

Answer 19

between proximal and distal rows of carpals and in-between the carpals

enclosed w/in synovial capsule

Question 20

midcarpal joint - mvts

Answer 20

1. some flex/ext

2. radial deviation

Question 21

radial deviation at the midcarpal joint

Answer 21

especially due to mvt of head of capitate in its socket

Question 22

midcarpal joint - ligaments

Answer 22

1. dorsal ligaments
2. palmar ligaments
3. interosseous ligaments

Question 23

midcarpal joint - arteries

Answer 23

articular arteries from dorsal/palmar arches

Question 24

midcarpal joint - nerves

Answer 24

articular nerves
ant/post interosseous n
dorsal/deep branches of ulnar n.

Question 25

the radiocarpal and midcarpal share the same …..

Answer 25

arteries and nerves

Question 26

relate median nerve and palmaris longus tendon

Answer 26

nerve is under tendon

Question 27

palmar structure sequence: radial to ulnar

Answer 27

``` radial art. flex carpi radialis tendon median nerve flex digit superfi tendon ulnar art. ulnar n. flex carpi ulnaris tendon ```

Question 28

radiocarpal joint injuries

Answer 28

1. colle's fracture | 2. scaphoid fracture (compromises radial art)

Question 29

wrist flexion

Answer 29

midcarpal jt | radiocarpal jt

Question 30

wrist extension

Answer 30

radiocarpal jt | midcarpal jt

Question 31

radial deviation

Answer 31

15-25 degrees | mostly midcarpal jt

Question 32

ulnar deviation

Answer 32

30-45 degrees | mostly midcarpal jt

Question 33

ligaments of the wrist, hand and digits

Answer 33

- -collateral lig - -carpal lig - -metacarpal lig - -carpometacarpal lig - -palmar lig - -intermetacarpal lig

Question 34

tendons that define the anatomical snuff box

Answer 34

extensor pollicus longus ext. pollicus brevis abd. pollicus longus

Question 35

dorsal-medial line of snuff box

Answer 35

ext. pollicus longus

Question 36

palmar border of snuff box

Answer 36

ext. pollicus brevis

Question 37

tendon running w/ ext. pollicus brevis of the snuff box

Answer 37

abductor pollicus longus

Question 38

what artery lies on top of the scaphoid

Answer 38

radial artery

Question 39

floor of the snuff box

Answer 39

scaphoid

Question 40

roof of the snuff box

Answer 40

branches of superficial radial nerve

Question 41

contents of snuff box

Answer 41

radial artery site for radial pulse

Question 42

abductor pollicus longus - prox/dis attachments

Answer 42

posterior proximal ulna distal radius interosseous memb. base of 1st metacarpal

Question 43

abductor pollicus longus - actions, blood supply, nerves

Answer 43

abduct thumb and ext. post. interosseous art. post. interosseous n C7-8

Question 44

extensor pollicus brevis - prox/dis attachment

Answer 44

post. distal radius interosseous memb. dorsal proximal phalange of thumb

Question 45

extensor pollicus brevis - action, blood supply, nerves

Answer 45

extend prox phalange at mcp and the carpometacarpal jt post. interosseous art. post. interosseous n C7-8

Question 46

extensor pollicus longus - prox/dis attachment

Answer 46

post. mid ulna interosseous memb. dorsal distal phalanx of thumb

Question 47

extensor pollicus longus - action, blood supply, nerves

Answer 47

extend distal phalanx at IP jt extend mcp jt and carpometacarpal jt post. interosseous art. and perforating ant. interosseous art. post. interosseous n C7-8