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Upper and Lower limb > wrist/fingers > Flashcards

wrist/fingers Flashcards

1
Q

muscles flexing the wrist?

A
  • flexor carpi ulnaris
  • flexor carpi radialis
  • palmaris longus
  • flexor digitorum superficialis
  • flexor digitorum profundus
  • flexor pollicis longus
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2
Q

action of flexor carpi ulnaris?

A
  • flexes the hand at the wrist joint
  • when working with extendor carpi ulnaris it produces adduction of the hand at the wrist
  • important role in stabilising the pisiform during abduction of the little finger
  • as with flexor carpi radialis, ulnaris is an important synergist in extension of the fingers preventing unwanted extension of the wrist
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3
Q

action of flexor carpi radialis?

A
  • works with palmaris longus to flex the wrist
  • abduction of the wrist is produced by the combination of muscles
  • may aid in pronation due to its oblique course in the forearm
  • can also help flex the elbow
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4
Q

action of palmaris longus?

A
  • weak flexor of the wrist
  • due to its attachments to the palmar aponeurosis, it may have some slight action in flexing the MCJ as it tightens the palmar fascia
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5
Q

muscles extending the wrist?

A
  • extensor carpi radialis brevis
  • extensor carpi radialis longus
  • extensor indicis
  • extensor digitorum
  • extensor digiti minimi
  • extensor pollicis longus
  • extensor pollicis brevis
  • extensor carpi ulnaris
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6
Q

action of extensor carpi radialis longus/ brevis?

A
  • extensor of the wrist
  • when working with FCR will produce abduction of the wrist
  • may also help flex the elbow joint
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7
Q

Functional activity of extensor carpi radialis longus/ brevis?

A
  • gripping action, has a synergist role
  • by maintaining the wrist in an extended position, flexion of the wrist under the action of FDS/P is prevented
  • if the wrist is then allowed to flex the flexor tendons cannot shorten sufficiently to produce effective movement at the IPJ
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8
Q

action of extensor carpi ulnaris?

A

extension of the wrist, when working with FCU and ECU produces adduction of the wrist

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9
Q

muscles flexing the fingers?

A

flexor digitorum superficialis
flexor digitorum profundus
lumbricals
flexor digiti minimi brevis

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10
Q

action of flexor digitorum superficialis?

A
  • the primary flexor of the MPJ and proximal IPJ

- As it crosses the wrist it also aids in flexion of the wrist

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11
Q

action of flexor digitorum profundus?

A
  • flexion of the distal IPJ

- as it crosses several other joints during its course it also aids in flexion of the proximal IPJ, MCJ and wrist joints

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12
Q

action of the lumbricals?

A
  • flex MCJ and extend both IPJ of the corresponding fingers

- e.g. writing

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13
Q

action of flexor digiti minimi brevis?

A
  • flexes the MCJ of the little finger
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14
Q

muscles flexing the thumb?

A
  • flexor pollicis longus

- flexor pollicis brevis

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15
Q

action of flexor pollicis longus?

A

ONLY flexor of the IPJ of thumb
gripping activities
also flexes the MCJ of the thumb and wrist joint

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16
Q

action of flexor pollicus brevis?

A

flexion of the thumb at the MCJ and CMJ

it continues action tends to produce rotation of the thumb

17
Q

muscles extending the fingers?

A
  • extensor digitorum
  • extensor indicis
  • lumbricals
  • extensor digiti minimi
18
Q

action of extensor digitorum?

A
  • extension of the MCJ of littel finger

- also help extend both IPJ, but the main extenors of these joints are the interossei and lumbricals

19
Q

action of extensor digiti minimi?

A
  • assists in extensor digitorum in extending the MCJ of the little finger
  • also aids in wrist extension
20
Q

action of extensor indicis?

A
  • aids in extension of the wrist
  • enables the index finger to be used independently
  • assists in extensor digitorum in its action with respect to the joints of the index finger
21
Q

muscles extending the thumb?

A
  • extensor pollicis longus

- extensor pollicis brevis

22
Q

action of extensor pollicis longus?

A
  • assists in extension and abduction of the wrist
  • once this has been achieved it pulls the first metacarpal into a lateral rotation and abducted position
  • In full abduction or extension of the thumb, can act as a adductor
  • may contribute slightly in supination, due to its oblique course across the lower part of the forearm
23
Q

action of extensor pollicis brevis?

A

extends both the CMJ and MCJ of the thumb

also may help in extending an abducting the wrists, particularly against resistance

24
Q

muscles abducting/ adducting/ opposing the thumb?

A 
abductor pollicis longus
abductor pollicis brevis
opponens pollicis
adductor pollicis
palmaris brevis
25
Q

action of abductor pollicis longus?

A
  • puts the thumb into a mid- extended and abducted position

- working with extensors it helps to extend the thumb at the CMJ while the abductor pollicis brevis abducts the thumb

26
Q

action of abductor pollicis brevis?

A
  • abducts the thumb at both the CMJ and MCJ causing it to move anteriorly at the right angles to the palm
  • in order to achieve this movement, there must be some medial rotation at the CMJ, the remainder at the MCJ
  • can aid in flexion of the MCJ and extension of the IPJ
27
Q

which muscle is involved with the princer grip action of the thumb?

A

abductor pollicis brevis

28
Q

action of opponens pollicis?

A
  • opposition where the 1st metacarpal is drawn forwards and towards and medially in an arc towards the fingers
  • the importance of this action is the tip of the thumb can be brought into contact with the tip of any finger
29
Q

action of palmaris brevis?

A
  • contraction wrinkles on the ulnar side of the skin and produces good grip
30
Q

muscles abducting/ adducting/ opposing the fingers?

A
  • palmar interossei
  • dorsal interossei
  • abductor digiti minimi
  • opponens digiti minimi
31
Q

action of palmar interossei?

A
  • adduct the thumb, index, ring and little finger towards the middle finger
  • the 1st palmar interossei assists in flexing with the pollicis brevis in flexing the thumb at the MCJ
  • the 3 remaining interossei, by their attachment to the dorsal digital expansion assist the lumbricals in flexing the MCJ and extending both IPJ
32
Q

action of dorsal interossei?

A
  • abductors of the index middle and ring fingers
  • The 1st dorsal interossei can rotate the index finger at the MCJ
  • it also may assist adductor pollicis in adduction of the thumb
  • assist the lumbricals in producing flexion and extension of the MCJ and IPJ joints respectively
33
Q

action of abductor digiti minimi?

A
  • pulls the little finger away from the ring finger into a position of abduction
  • also may help flex the MCJ
  • also may extend the IPJ
  • plays an important role in grasping a large object with outspread fingers
34
Q

action of opponens digiti minimi?

A
  • pulls the little finger forwards towards the palm and rotates it laterally at the CMJ
  • This movement deepens the hollow of the hand, and is necessary part of the opposition of the little finger

Upper and Lower limb (7 decks)

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