Elbow and Wrist anatomy Flashcards Preview

Medicine > Elbow and Wrist anatomy > Flashcards

Flashcards in Elbow and Wrist anatomy Deck (52):
1

how many degrees of freedom does the elbow have?

one

2

where do the flexor muscles originate?

medial epicondyle of the humerus

3

where do the extensor muscles originate?

lateral epicondyle of the humerus

4

which ligament anchors radius to the ulna?

anular ligament

5

what type of joint is the radioulnar jt?

pivot (pronation, supination)

6

when is there no contact between humerus and radius?

extension

7

what reinforces the elbow capsule?

ligaments and tendons of muscles
it is otherwise weak

8

what is normal carrying angle of the arm?

cubitus valgus (15 degrees)

9

what are the parts of the medial (ulnar) collateral ligament?

anterior (most resistant to valgus force)
oblique
posterior

10

what is the shape of the lateral (radial) collateral ligament?

fan shaped

11

which elbow ligament is stronger?

ulnar collateral

12

who are major elbow flexors?

biceps brachii
brachialis
bracioradialis

13

who are the major elbow extensors?

triceps
anconeus

14

where does the short head of the biceps originate?

coracoid process

15

how many joints does the biceps affect?

2 (shoulder, elbow)
(2 joint muscles tend to cause more clinical problems)

16

what is the function of the coracobrachialis?

primarily a shoulder flexor

17

where does the brachialis insert?

coronoid process of the ulna

18

which is the thickest of the flexor muscles?

brachialis

19

where is the O/I of the brachioradialis?

O: lateral supracondylar ridge
I: radial styloid process

20

when is the brachioradialis NOT active?

eccentric contraction

21

when is brachioradialis MOST active?

load and forearm is pronated (biceps is best during supination)

22

where does the long head of the triceps originate?

infraglenoid tubercle of scapula

23

where do the medial and lateral heads of triceps originate?

humerus

24

where do all 3 heads of the triceps insert?

olecranon

25

what is the anconeus muscle?

small triangle muscle
O: lateral epicondyle to olecranon
assists triceps

26

what lines the inside of the annular ligament?

hyaline cartilage

27

which forearm bone takes 80% of the weight bearing?

radius

28

what are the ligaments present at the radioulnar joint?

annular
quadrate
oblique

29

when is the interosseus ligament tense?

when forearm is neutral (its relaxed when fully pronated or supinated)

30

what type of bone is the pisiform?

sesamoid bone

31

what type of joints are the midcarpal joints?

plane joints with no true capsule

32

which muscles make up the snuff box?

extensor pollicus longus
extensor pollicus brevis

33

why are snuff box injuries dangerous?

low, low perfusion

34

what are the dorsal radiocarpal ligaments??

from radial styloid to the lunate and and triquetrum (contact between lunate and radius)

35

what are the volar radiocarpal ligaments?

radiocapitate
radiotriquetral (strongest and supports lunate)
radioscaphoid

36

what are attachments of ulnar collateral ligament of the wrist?

from ulna to pisiform and triquetrum

37

what are the attachments of radial collateral ligament of the wrist?

from radius to scaphoid, trapezium and 1st MC

38

what are the attachments of the ulnocarpal ligament?

triangular fibrocartilage to lunate and capitate

39

which nerve innervates most of the flexor muscles of the forearm?

median nerve (except for flexor carpi ulnaris)

40

what action do flexor digitorum superficialis do?

movement at PIP joint (not DIP) phalnx 2-5

41

what does flexor digitorum profundus cause?

DIP joints of phalnx 2-5

42

what innervates flexor digitorum profundus?

ulnar and median nerve

43

what action does flexor pollicis longus do?

thumb motion

44

what innervates most of the extensor muscles?

radial nerve

45

who is the largest carpal bone and the keystone of the proximal transverse arch?

capitate bone

46

what gives MCP joints their stability?

ligaments

47

what joint is doing the work for the thumb?

CMC joint (that's the saddle joint) not the MCP

48

what is the functional positional of the hand?

claw look (beer grasp)
tenodesis (important for quadroplegics)

49

which nerve innervates the intrinsic hand muscles?

ulnar

50

what are lumbricals?

intrinsic muscle of the hand that pulls hand into a bucket position

51

what is the role of the interossei muscles?

ab/adduct hands

52

which palmar interosseus is responsible for abduction of the hand?

dorsal

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