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MSK UPPER LIMBS (S9) > Muscles of the hand > Flashcards

Muscles of the hand Flashcards

1
Q

What does INTRINSIC muscles of the hand refer to?

A

Muscles that originate within the hand and insert within the hand

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2
Q

What does EXTRINSIC muscles of the hand refer to?

A

Muscles that originate within the forearm and insert within the hand

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3
Q

What are the muscles of the THENAR compartment of the hand?

A

Thenar = thumb

  • Abductor pollicis brevis
  • Flexor pollicis brevis
  • Opponens pollicis
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4
Q

What is the thenar eminence?

A

The muscular prominence on the radial aspect of the palm

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5
Q

Opponens Pollicis

A

O: Trapezium and flexor retinaculum

I: Lateral border of 1st metacarpal

I: Median nerve

A: Opposes thumb (medially rotating and flexing 1st metacarpal)

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6
Q

Abductor Pollicis Brevis

A

O: Scaphoid, trapezium and flexor retinaculum

I: Lateral border of proximal phalanx of thumb

I: Median nerve

A: Abducts the thumb

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7
Q

Flexor Pollicis Brevis

A

O: Trapezium and flexor retinaculum (superficial head) Trapezoid and capitate (deep head)

I: Ulnar aspect of base of proximal phalanx of thumb

I: Ulnar nerve

A: Flexes metacarpophalangeal joint of thumb

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8
Q

What is the muscles of the adductor compartment of the hand?

A

Adductor pollicis

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9
Q

Adductor Pollicis

A

O: Shaft of 3rd metacarpal (transverse head) Capitate and base of 2nd and 3rd metacarpals (oblique head)

I: Ulnar aspect of base of proximal phalanx of thumb

I: Ulnar nerve

A: Adduct thumb

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10
Q

What are the muscles of the hypothenar compartment of the hand?

A
  • Opponenes digiti minimi
  • Abductor digiti minimi
  • Flexor digiti minimi brevis
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11
Q

What is the hypothenar eminence?

A

A muscular prominence on the ulnar aspect of the palm

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12
Q

Opponens Digiti Minimi

A

O: Hook of the hamate and flexor retinaculum

I: Ulnar margin of 5th metacarpal

I: Ulnar nerve

A: Rotates the 5th metacarpal towards the palm = opposition against the thumb

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13
Q

Abductor Digiti Minimi

A

O: Pisiform and tendon of flexor carpi ulnaris

I: Base of proximal phalanx of little finger

I: Ulnar nerve

A: Abducts little finger

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14
Q

Flexor Digiti Minimi Brevis

A

O: Hook of the hamate and flexor retinaculum

I: Base of proximal phalanx of little finger

I: Ulnar nerve

A: Flexion of metacarpophalangeal joint of little finger

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15
Q

What are the muscles of the central compartment of the hand?

A
  • Palmaris brevis
  • Palmar interossei
  • Dorsal interossei
  • Four lumbricals (2x radial, 2x ulnar)
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16
Q

Palmaris Brevis

A

O: Palmar aponeurosis and flexor retinaculum

I: Dermis of skin on medial margin of hand

I: Ulnar nerve

A: Wrinkles the skin of hypothenar eminence, deepens the curvature of the palm and improving grip

17
Q

Lumbrical I (unipennate)

A

O: FDP to index finger

I: Extensor digitorum to index finger

I: Median nerve

A: Flexion at metcarpophalanheal joint, extension at interphalangeal joints

18
Q

Lumbrical II (unipennate)

A

O: FDP to middle finger

I: Extensor digitorum to middle finger

I: Median nerve

A: Flexion at metcarpophalanheal joint, extension at interphalangeal joints

19
Q

Lubrical III (bipennate)

A

O: FDP to middle and ring finger

I: Extensor digitorum to ring finger

I: Ulnar nerve

A: Flexion at metcarpophalanheal joint, extension at interphalangeal joints

20
Q

Lubrical IV (bipennate)

A

O: FDP to ring and little finger

I: Extensor digitorum to little finger

I: Ulnar nerve

A: Flexion at metcarpophalanheal joint, extension at interphalangeal joints

21
Q

Dorsal Interossei I (bipennate)

A

O: Shaft of the first and second metacarpals

I: Radial aspect of base of proximal phalanx of index finger

I: Ulnar nerve

A: Abducts the index finger DAB, assists lumbricals in flexing MCPJ and extending IPJ

22
Q

Dorsal Interossei II (bipennate)

A

O: Shaft of the second and third metacarpals

I: Radial aspect of base of proximal phalanx of middle finger

I: Ulnar nerve

A: Radially abducts middle finger DAB, assists lumbricals in flexing MCPJ and extending IPJ

23
Q

Dorsal Interossei III (bipennate)

A

O: Shaft of the third and fourth metacarpals

I: Ulnar aspect of base of proximal phalanx of middle finger

I: Ulnar nerve

A: Ulnar abducts middle finger DAB, assists lumbricals in flexing MCPJ and extending IPJ

24
Q

Dorsal Interossei IV (bipennate)

A

O: Shaft of the fourth and fifth metacarpals

I: Ulnar aspect of base of proximal phalanx of ring finger

I: Ulnar nerve

A: Abducts ring finger DAB, assists lumbricals in flexing MCPJ and extending IPJ

25
Q

Palmar Interossei I (unipennate)

A

O: Shaft of second metacarpal

I: Ulnar side of base of proximal phalanx of the index finger

I: Ulnar nerve

A: Adducts index finger PAD

26
Q

Palmar Interossei II (unipennate)

A

O: Shaft of fourth metacarpal

I: Radial side of base of proximal phalanx of ring finger

I: Ulnar nerve

A: Adducts ring finger PAD

27
Q

Palmar Interossei III (unipennate)

A

O: Shaft of fifth metacarpal

I: Radial side of base of proximal phalanx to little finger

I: Ulnar nerve

A: Adducts little finger PAD

MSK UPPER LIMBS (S9) (5 decks)

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