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MSK > Hand Muscles > Flashcards

Hand Muscles Flashcards

1
Q

Extensor digitorum (extrinsic muscle of hand)

  • Origin and insertion?
  • Innervation?
  • Actions?
A
  • Origin: lateral epicondyle of humerus
  • Insertion: splits into four tendons, which then each split into a central slip inserting onto middle phalanx and two lateral slips inserting onto distal phalanx
  • Innervation: radial nerve (posterior interosseus branch)
  • Actions: extension of PIPJ and DIPJ
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2
Q 
Thenar compartment of intrinsic muscles
Abductor pollicis brevis
- Origin and insertion?
- Innervation?
- Actions?
A
  • Origin: scaphoid, trapezium and flexor retinaculum
  • Insertion: lateral border of proximal phalanx of thumb
  • Innervation: median nerve
  • Actions: palmar abduction of thumb
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3
Q 
Thenar compartment
Opponens pollicis
- Origin and insertion?
- Innervation?
- Actions?
A
  • Origin: trapezium and flexor retinaculum
  • Insertion: lateral border of 1st metacarpal
  • Innervation: median nerve
  • Actions: opposition of thumb
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4
Q 
Thenar compartment 
Flexor pollicis brevis
- Origin and insertion?
- Innervation?
- Actions?
A
  • Origin: superficial head -trapezium and FR, deep head -trapezoid and capitate
  • Insertion: base of proximal phalanx of thumb
  • Action: flexes MCPJ of thumb
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5
Q 
Adductor compartment 
Adductor pollicis
- Origin and insertion?
- Innervation?
- Actions?
A
  • Origin: transverse head -3rd metacarpal, oblique head -2nd/3rd metacarpals
  • Insertion: both heads insert onto base of proximal phalanx of thumb
  • Action: adduction of thumb
  • Innervation: median nerve
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6
Q 
Hypothenar compartment
Opponens digiti minimi
- Origin and insertion?
- Innervation?
- Actions?
A

Deepest hypothenar muscle

  • Origin: hook of hamate & FR
  • Insertion: medial side of 5th metacarpal
  • Innervation: ulnar nerve
  • Action: opposition of little finger against thumb
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7
Q 
Hypothenar compartment 
Abductor digiti minimi
- Origin and insertion?
- Innervation?
- Actions?
A
  • Origin: pisiform and tendon of FCU
  • Insertion: proximal phalanx of little finger
  • Innervation: ulnar nerve
  • Actions: abduction of little finger
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8
Q 
Hypothenar compartment 
Flexor digiti minimi brevis
- Origin and insertion?
- Innervation?
- Actions?
A
  • Origin: hook of hamate and flexor retinaculum
  • Insertion: proximal phalanx of little finger
  • Innervation: ulnar nerve
  • Actions: flexion of MCPJ of little finger
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9
Q

Which intrinsic hand muscles does the central compartment contain?

A
  • palmaris brevis
  • palmar interossei
  • dorsal interossei
  • the four lumbricals
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10
Q

Palmaris brevis

  • Origin and insertion?
  • Innervation?
  • Actions?
A
  • Origin: palmar aponeurosis and FR
  • Insertion: dermis of skin on medial margin of hand
  • Innervation: ulnar nerve
  • Action: improves grip by wrinkling skin over hypothenar eminence and deepening curvature of palm
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11
Q

1st lumbrical

  • Origin and insertion?
  • Innervation?
  • Actions?
A
  • Origin: tendon of FDP to index finger. Note 1st lumbrical is unipennate
  • Insertion: extensor digitorum to index finger
  • Action: flexion at MCPJ, extension at IPJs
  • Innervation: median nerve
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12
Q

2nd lumbrical

  • Origin and insertion?
  • Innervation?
  • Actions?
A
  • Origin: FDP tendon to middle finger. Unipennate
  • Insertion: ED tendon to middle finger
  • Actions: flexion at MCPJ, extension at IPJs
  • Innervation: median nerve
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13
Q

3rd lumbrical

  • Origin and insertion?
  • Innervation?
  • Actions?
A
  • Origin: FDP tendon to middle and ring finger - bipennate
  • Insertion: ED tendon to ring finger
  • Innervation: ulnar nerve
  • Action: flexion at MCPJ, extension at IPJs
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14
Q

4th lumbrical

  • Origin and insertion?
  • Innervation?
  • Actions?
A
  • Origin: bipennate - FDP tendons to ring and little fingers
  • Insertion: ED tendon to little finger
  • Innervation: ulnar nerve
  • Action: flexion at MCPJs, extension at IPJs
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15
Q

What are the actions of the dorsal and palmar interosseus muscles?

A

Palmar ADduct the fingers PAD

Dorsal ABduct the fingers DAB

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16
Q

1st dorsal interosseus muscle

  • Origin and insertion?
  • Innervation?
  • Actions?
A
  • Origin: bipennate - 1st and 2nd metacarpal bones
  • Insertion: proximal phalanx of index finger & extensor expansion
  • Action: radial derivation of index finger
  • Innervation: ulnar nerve
17
Q

2nd dorsal interosseus muscle

  • Origin and insertion?
  • Innervation?
  • Actions?
A
  • Origin: 2nd/3rd metacarpals
  • Insertion: radial side of proximal phalanx of middle finger
  • Action: radial deviation of middle finger
  • Innervation: ulnar nerve
18
Q

3rd dorsal interosseus muscle

  • Origin and insertion?
  • Innervation?
  • Actions?
A
  • Origin: bipennate - 3rd/4th metacarpals
  • Insertion: ulnar side of proximal phalanx of middle finger
  • Action: ulnar deviation of middle finger
  • Innervation: ulnar nerve
19
Q

4th dorsal interosseus

  • Origin and insertion?
  • Innervation?
  • Actions?
A
  • Origin: bipennate - 4th/5th metacarpals
  • Insertion: ulnar side of proximal phalanx of ring finger
  • Action: ulnar deviation of ring finer
  • Innervation: ulnar nerve
20
Q

Why are there only three palmar interosseus muscles?

A

Thumb is adducted by adductor pollicis.

Middle finger is moved either way by 2nd and 3rd dorsal interossei.

21
Q

1st palmar interosseus

  • Origin and insertion?
  • Innervation?
  • Actions?
A
  • Origin: unipennate - 2nd metacarpal
  • Insertion: ulnar side of proximal phalanx of index finger
  • Action: adduction of index finger (towards middle finger)
  • Innervation: ulnar nerve
22
Q

2nd palmar interosseus

  • Origin and insertion?
  • Innervation?
  • Actions?
A
  • Origin: unipennate - 4th metacarpal
  • Insertion: radial side of proximal phalanx of ring finger
  • Action: adduction of ring finger
  • Innervation: ulnar nerve
23
Q

3rd palmar interosseus

  • Origin and insertion?
  • Innervation?
  • Actions?
A
  • Origin: 5th metacarpal
  • Insertion: radial side of proximal phalanx of little finger
  • Action: adduction of little finger
  • Innervation: ulnar nerve

MSK (13 decks)

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