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anatomy > Anterior compartment of forearm > Flashcards

Anterior compartment of forearm Flashcards

1
Q

What are the superficial muscles in the anterior compartment of forearm?

A
  • Pronator teres
  • Flexor carpi radialis
  • Palmaris longus
  • Flexor digitorum superficialis
  • Flexor carpi ulnaris
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2
Q

What are the deep muscles in the anterior compartment of forearm?

A
  • Flexor digitorum profundus
  • Flexor pollicis longus
  • Pronator quadratus
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3
Q

What is the origin of trapezius muscle?

A

External occipital protuberance and superior nuchal line of the back of the skull – ligamentum nuchae – spine processes of all thoracic vertebra T1 to T12

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4
Q

What is the insertion of deltoid?

A

Deltoid tuberosity

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5
Q

Actions of teres major

A

Adduction & medial rotation of the humerus

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6
Q

Origin of supraspinatus

A

Supraspinous fossa scapula

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7
Q

Where does the blood supply to the hand come from?

A
  • Superficial palmar arterial arch

- Deep palmar arterial arch

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8
Q

Where do finger flexor tendons lie?

A

Ulna bursae

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9
Q

Where do thumb flexor tendons lie?

A

Radial bursae

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10
Q

Where is the nerve supply to all the Intrinsic muscles of the hand from?

A

From the ulnar nerve (C8,T1)

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11
Q

What are the thenar muscles supplies by?

A

Median nerve

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12
Q

Where are constant creases present?

A

Where skin and superficial fatty layer bound to deep fibrous tissue

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13
Q

What is skin of palm bound to and why?

A

To deep fascia and thick to permit grasping

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14
Q

How can you remember the attachments of the flexor retinaculum?

A

STOP

  • Scaphoid
  • Trapezium
  • HOck of hamate
  • Pisiform
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15
Q

What does the flexor retinaculum form?

A

The fibro-osseous carpal tunnel

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16
Q

What does the osseo-fascial carpal tunnel cover?

A

10 tendons and a nerve

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17
Q

Name the tendons and nerve that the osseo-fascial carpal tunnel cover

A
  • FDS - 4
  • FDP - 4
  • FCR - 1
  • FPL1
  • Median nerve
  • The radial and ulna bursae
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18
Q

What is the flexor retinaculum crossed superficially by?

A
  • Ulnar nerve & artery (Guyon’s tunnel)
  • Palmar cutaneous branch of ulnar nerve
  • Palmar cutaneous branch of median nerve
  • Tendon of palmaris longus
  • Superficial palmar branch of Radial Artery
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19
Q

What does the flexor retinaculum give attachment to superficially?

A

Thenar and hypothenar muscles

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20
Q

What attaches the palmar aponeurosis to underlying skin?

A

Fibrous septa

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21
Q

What is palmar aponeurosis in relation to thenar and hypothenar muscles?

A

Thin layer of deep fascia over thenar and hypothenar muscles.

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22
Q

What is the palmar aponeurosis?

A

A strong centrally placed triangular thickening of deep fascia

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23
Q

What does the palmar aponeurosis cover/

A
  • Superficial palmar arch artery

- Long flexor tendons

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24
Q

What does the proximally point of triangle blend with?

A

Flexor retinaculum & gives attachment to PL

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25
Q

What are the fibrous flexor sheaths in continuity with?

A

With slips from the palmar aponeurosis

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26
Q

What do fibrosseous tunnels attach to?

A

To the sides of the phalanges arching over the flexor tendon sheaths

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27
Q

Where do fibrosseous tunnels extend from and to?

A

From base of proximal phalanx to base of the distal phalanx (all fingers and thumb)

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28
Q

What are the fibrous flexor tunnels strengthened by?

A

By additional annular and cruciate fibres (pulleys)

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29
Q

Where are annular pulleys placed?

A

Anterior to 1st MCP (A1), middle third proximal phalanx (A2), proximal interphalangeal joint (A3) and middle third of middle phalanx (A4)

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30
Q

What are in between fibrous flexor sheaths?

A

The cruciate pulleys (C1, C2, C3)

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31
Q

What do the cruciate pulleys consist of?

A

Weaker crossing fibres

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32
Q

How many annular pulley are in the thumb?

A

Two

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33
Q

Where are the annular pulleys of the thumb?

A

A1 anterior to the MCPJ and A2 pulley proximal to

the interphalangeal joint

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34
Q

Where is the oblique pulley of the thumb?

A

Over middle third proximal phalanx.

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35
Q

What do fibrous flexor sheaths, palmar aponeurosis and flexor retinaculum prevent?

A

Prevent bow-stringing of the

flexor tendons and therefore increase the effectiveness of the grip

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36
Q

What are the three thenar muscles?

A

OAF

  • Opponens pollicis
  • Abductor pollicis brevis
  • Flexor pollicis brevis
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37
Q

What is the most superficial thenar muscle?

A

Abductor Policis Brevis

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38
Q

What is the nerve supply of the thenar muscles?

A

The recurrent branch of the median nerve

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39
Q

What is the nerve supply of the hypothenar muscles?

A

Deep branch of ulnar nerve

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40
Q

What are the hypothenar muscles?

A

OAF

  • Opponens digiti minimi
  • Abductor digiti minimi
  • Flexor digiti minimi
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41
Q

What are the attachments of the abductor digiti minimi?

A

Pisiform bone -> ulnar side of base proximal phalanx

42
Q

What are the attachments of opponens digiti minimi?

A
  • Hook of hamate

- Flexor retinaculum

43
Q

What are the attachments of the flexor digiti minimi?

A
  • Hook of hamate

- Flexor retinaculum

44
Q

Where do the muscles of lumbricals lie?

A

In own fascial tunnel

45
Q

Where do the tendons of lumbricals lie and attach?

A

Pass anteriorly to MCP joints and then posteriorly to attach to laterally side of dorsal extensor expansion of the digits

46
Q

What are the actions of lumbricals?

A

Flexion of MCP joints as and then assist extension of the interphalangeal joints by tensioning the extensor expansion

47
Q

What is the nerve supply of the 1st and 2nd lumbricals?

A

Median nerve

48
Q

What is the nerve supply of the 3rd and 4rd lumbricals?

A

Ulnar nerve

49
Q

What lies deep to flexor digitorum superficialis?

A

Flexor digitorum profundus

50
Q

What happens to tendons of flexor digitorum superficials that were lying over eachother in the carpal tunnel? (palm)

A

They fan out in the palm

51
Q

What are flexor tunnels in the deep fascial fibrous flexor tunnels covered by?

A

Synovial sheath

52
Q

What are the deep muscles of the hand?

A
  • Interossei

- Adductor pollicis

53
Q

What are the interossei and adductor pollicis supplied by?

A

Deep branch ulnar nerve

54
Q

What is a good test for C8/T1 root and ulnar nerve?

A

Flexion of 1st dorsal interosseous

55
Q

What are the oblique head attachments of adductor pollicis?

A
  • Palmar surface bases of 2nd & 3rd metacarpals

- Adjacent carpal bones

56
Q

What are the transverse head attachments of adductor pollicis?

A
  • Palmar surface of shaft of 3rd metacarpal phalange
57
Q

What are the distal attachments of adductor pollicis?

A

Ulnar & radial sides of base proximal phalanx of the thumb by small tendons
which both contain sesamoid bones

58
Q

What are the actions of adductor pollicis?

A

Adduction and assists opposition of thumb

59
Q

What are the proximal attachments of the interossei?

A

3 small palmar interossei arise by 1 head from palmar surface of 1st, 2nd, &
4th MCP’s; and 4 large dorsal interossei arise deeply by 2 heads from adjacent sides of MCP’s

60
Q

What are the distal attachmetns of the interossei?

A

Tendons attach to the base of their corresponding proximal phalanx plus to
the dorsal extensor expansion of the fingers

61
Q

What is the function of the palmar interossei?

A

Adduct

62
Q

What is the function of the dorsal interossei?

A

Abduct

63
Q

What does the superficial fascia and fatty layer contain?

A

Dorsal venous network of veins

64
Q

What is the clinical note for dorsum of hand?

A

Common site for iv cannulation

65
Q

What does the deep fascia layer cover?

A

Covers layer of extensor tendons passing to thumb and extensor expansion of fingers

66
Q

To what do lumbricals attach in the dorsal extensor expansion of the fingers?

A

To the lateral side of the extensor expansion

67
Q

When can lumbricals help to do? (exd)

A

Can help to extend the interphalangeal joint

68
Q

What does the dorsal extensor expansion of the fingers consist of?

A

Consists of a triangular hood over MCP joint to which the main extensor tendons are attached

69
Q

What emerges from the triangular hood over MCP joint?

A

A central band and 2 collaterals emerge

70
Q

Where does the central slip of the dorsal extensor expansion pass over and attach to?

A

Over the proximal interphalangeal joints and attaches to the base of the middle phalanx

71
Q

Where do the two collateral slips of the dorsal extensor expansion pass?

A

They pass either side of the proximal interphalangeal joints merge over the distal middle phalanx and pass
over the distal interphalangeal joint to attach to the base of the distal phalanx

72
Q

What can the interossei assist the long extensors with?

A

With finger extension

73
Q

What is the superficial palmar arterial arch a direct continuation of?

A

The ulnar artery

74
Q

What is the deep palmar arterial arch formed by?

A

The radial artery

75
Q

What is the superficial palmar compartment arterial arch deep to?

A

The palmar aponeurosis

76
Q

What might the superficial palmar arch artery anastomose with?

A

With the superficial palmar branch of the radial artery.

77
Q

Where does the superficial palmar arch artery lie?

A

Across the centre of the palm

78
Q

What arteries does the superficial palmar arch artery give off?

A

A digital artery to ulnar side of the little finger and three common palmar digital arteries

79
Q

What do palmar digital arteries anastomose with?

A

Dorsal digital arteries supplying dorsum and nail beds

80
Q

Where does the radial artery cross in the wrist/hand?

A

It crosses the anatomical snuffbox and passes to the dorsum of the hand

81
Q

Where does the deep palmar arch artery run?

A

It runs deeply between the two heads of the first dorsal interosseous muscle.

82
Q

Where does the deep palmar arch artery give off larges branches to?

A
  • To radial side of index finger

- To thumb

83
Q

Where does the princeps policis pass?

A

It passes along the 1st metacarpal

84
Q

What does the princeps policis divide into?

A

Divides into two palmar digital branches

85
Q

Where does the main radial artery pass in hand?

A

Passes between two heads of adductor pollicis to form the deep palmar arch

86
Q

What is the deep palmar arch an arterial arcade anastomoses with?

A

The deep branch of the ulnar artery

87
Q

Where does the deep branch of the ulnar nerve lie?

A

Within the concavity of the deep arch.

88
Q

How many palmar metacarpal arteries does the deep palmar arch artery give off?

A

Three

89
Q

What is the function of accompanying veins of the deep palmar arch artery?

A

They drain most of the blood from the palm into the dorsal venous network

90
Q

What type of joints are the carpal joints?

A

Plane synovial

91
Q

What is the degree of freedom of carpal joints?

A

1º

92
Q

What are the ligaments of the carpal joints?

A

Capsular: formed by many small fibrous bands capsule loose cavity continuous between bones.

93
Q

What does the synovial membrane of the carpal joints do?

A

lines non-articular surfaces

94
Q

Stability of the carpal joint

A

Stable - dependent on complex set of ligaments both palmar and dorsal & Interosseous Ligaments.

95
Q

What is the nerve supply of the interosseous

A
  • Anteriorly - Interosseous nerve (median)

- Posteriorly - Interosseous nerve (radial)

96
Q

What are the articular surfaces of the carpal joints?

A

Extensive Composite Joint / individual joints are planar - composite joints are condyloid form a continuous space between 1st & 2nd rows of carpal bones many small articular facets.

97
Q

What type of joint are carpometacarpal joints?

A

Plane synovial

98
Q

What is the degree of freedom of carpometacarpal joints?

A

1º

99
Q

What are the articular surfaces of carpometacarpal joints?

A

Distal facets of carpus proximal surfaces bases of metacarpals

100
Q

What are the ligaments of carpometacarpal joints?

A

Capsular: continuous cavity thickenings of capsule dorsal & palmar carpometacarpal ligaments
dorsal & palmar metacarpal ligaments

101
Q

What are the movements of the carpometacarpal joints?

A

Flexion from 2nd to 5th metacarpal

anatomy (23 decks)

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