Week 9 - forearm and wrist Flashcards

1
Q

Flexor pollicis longus

A

Flexion of the thumb

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2
Q

Extensor digiti minimi

A

Extension of little finger

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3
Q

Flexor carpi radialis

A

Flexion and radial deviation of wrist (movement of wrist towards radius - wrist abduction)

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4
Q

Extensor carpi ulnaris

A

Extension and ulnar deviation (movement of wrist towards ulna - wrist adduction)

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5
Q

Where do the flexors of the wrist and digits lie

A

On the anterior aspect of the forearm

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6
Q

3 layers of muscle of the flexors of the wrist and digits

A

2-1-3 formation
2 on the deep layer
1 on the intermediate
3 on the superficial layer

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7
Q

What does each member of this football team do (2-1-3 formation)

A

Goalkeeper keeps sucking his thumb
Defender has very long fingers, meaning he can hold a book and make profound statements

Midfielder has quite long fingers

Central striker likes scoring with palm of hand
Two wingers - one keeps shouting FCR and the other FC-U

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8
Q

2 muscles in the deep layer

A

Flexor pollicis longus (goalkeeper)
Flexor Digitorum profundus (long fingered defender)

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9
Q

Origin and insertion of the flexor pollicis longus

A

Anterior radius –> distal phalanx of thumb

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10
Q

Origin and insertion of flexor digitorum profundus

A

Ulna –> distal phalanges of fingers

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11
Q

1 muscle in the intermediate layer

A

Flexor digitorum superficialis (long fingered midfielder)

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12
Q

Origin and insertion

A

Medial epicondyle of elbow –> middle phalanges of fingers

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13
Q

Difference between the flexor digitorum superficialis and the flexor digitorum profundus

A

The flexor digitorum superficialis inserts into the middle phalanges of fingers and the flexor digitorum profundus inserts into the distal phalanges meaning the profundus can flex the ends of the fingers (distal interphalangeal joint)

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14
Q

3 muscles in the superficial layer

A

Flexor carpi radialis (FCR)
Flexor carpi ulnaris (FCU)
Palmaris Longus

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15
Q

Flexor carpi radialis
What does it do + origin/insertion

A

Flexes wrist
Radial devotion
Medial epicondyle of elbow –> base metacarpal II

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16
Q

Flexor carpi ulnaris
What does it do + origin/insertion

A

Wrist flexion
Ulnar deviation
Medial epicondyle of elbow –> metacarpal V

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17
Q

Palmaris Longus
What does it do + origin/insertion

A

Weak wrist flexor
Anchors skin and fascia of hand
Medial epicondyle of elbow –> palmar fascia

18
Q

Where do the extensors of the wrist and digits lie

A

On the posterior aspect of the forearm

19
Q

Wrist flexion and extension

A

Wrist flexion is moving fingers towards palm of hand

20
Q

5 muscles in the posterior superficial layer

A

Extensor carpi radialis longus
Extensor carpi radialis brevis
Extensor digitorum
Extensor digiti minimi
Extensor carpi ulnaris

21
Q

All the superficial extensors originate from the

A

Lateral epicondyle of elbow

22
Q

Extensor carpi radialis longus

A

Wrist extension
Radial deviation
Lateral epicondyle –> base metacarpal II

23
Q

Extensor carpi radialis brevis

A

Wrist extension
Radial deviation
Lateral epicondyle –> base metacarpal III

24
Q

Extensor digitorum

A

Extends fingers
Lateral epicondyle –> dorsal digital expansion

25
What is the dorsal digital expansion
Fibrous extension of extensor digitorum tendons on back of fingers
26
Extensor digiti minimi
Extends little finger Lateral epicondyle --> dorsal digital expansion
27
Extensor capri ulnaris
Wrist extension Ulnar deviation Lateral epicondyle --> base metacarpal V
28
4 muscles in the posterior deep layer
Extensor indicis Extensor pollicis longus Extensor pollicis brevis Abductor pollicis longus
29
Extensor indicis
Extends index finger Inserts into dorsal digital expansion
30
Extensor pollicis longus
Extends thumb Inserts into distal phalanx (therefore extends every digit in thumb)
31
Extends pollicis brevis
Extends joint Inserts into proximal phalanx (dosent extend IP joint)
32
Abductor pollicis longus
Abducts and extends thumb Inserts into base metacarpal I
33
Thenar and hypothenar eminence
Thenar - fleshy compartment at base of thumb - moves the thumb Hypothenar - fleshy compartment at base of little finger - moves the digiti minimi
34
2 muscles that create opposition of the thumb and little finger
Opponens policis muscle Opponens digiti minimi
35
2 muscles that flex the thumb and little finger
Flexor pollicis brevis Flexor digiti minimi
36
2 muscles that abduct the thumb and little finger
Abductor pollicis brevis and abductor digiti minimi
37
How does abduction and adduction work in the hand
We take a new centre line - the middle finger Movement away from middle finger = abduction
38
Muscles that adduct the fingers
First palmar interosseous - on the side of the first finger towards the middle finger Second palmar interosseous (on third finger) Third palmar interosseous (on fourth finger)
39
Muscles that abduct the fingers
First dorsal interosseous - first finger Second dorsal interosseous - middle finger - has 2 attatchment points to allow it to abduct from midline both ways Third dorsal interosseous - third finger Fourth dorsal interosseous - forth finger
40
Role of the lumbricals
Link the flexor and extensor tendons of hand Flex at metacarpal joint whilst extending at interphalangeal joint