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Anatomy > Muscles of the Hand > Flashcards

Muscles of the Hand Flashcards

1
Q

Extensor Tendon Compartment #1 (Lateral to Medial)

A

ABductor Pollicis Long, Extensor Pollicis Brevis

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2
Q

Extensor Tendon Compartment #2(Lateral to Medial)

A

Extensor Carpi Radialis Longus and Extensor Carpi Radialis Brevis

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3
Q

Extensor Tendon Compartment #3 (Lateral to Medial)

A

Extensor Pollicis Longus

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4
Q

Extensor Tendon Compartment #4 (Lateral to Medial)

A

Extensor Digitorum and Extensor Indicis

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5
Q

Extensor Tendon Compartment #5 (Lateral to Medial)

A

Extensor Digiti Minimi

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6
Q

Extensor Tendon Compartment #6 (Lateral to Medial)

A

Extensor Carpi Ulnaris

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7
Q

Muscle of the Thenar compartment

A
  1. ABductor Pollicis Brevis
  2. Flexor Pollicis Brevis
  3. Opponens Pollicis
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8
Q

Abductor Pollicis Brevis Origin

A

Flexor Retinaculum and lateral pillars of carpal tunnel (scaphoid and trapezium bones)

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9
Q

Abductor Pollicis Brevis Insertion

A

Lateral side, base of proximal phalanx and extensor hood of thumb

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10
Q

Abductor Pollicis Brevis Innervation

A

Motor recurrent branch of the Median Nerve (C8/T1)

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11
Q

Abductor Pollicis Brevis Action

A

Abduction of the thumb

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12
Q

Flexor Pollicis Brevis Origin

A

Flexor retinaculum and tubercle of the trapezium bone

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13
Q

Flexor Pollicis Brevis Insertion

A

Lateral side, base proximal phalanx; sesamoid bone at head of 1st metacarpal bone

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14
Q

Flexor Pollicis Brevis Innervation

A

Motor recurrent branch of the Median Nerve C8/T1

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15
Q

Flexor Pollicis Brevis Action

A

Flexion of thumb

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16
Q

Opponens Pollicis Origin

A

Flexor Retinaculum and tubercle of trapezium bone

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17
Q

Opponens Pollicis Insertion

A

Whole length of 1st metacarpal bone, palmar surface and lateral margin

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18
Q

Opponens Pollicis Innervation

A

Motor recurrent nerve of Median Nerve (C8-T1)

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19
Q

Opponens Pollicis Action

A

Thumb opposition (Rotates 1st MC medially and draws thumb toward center of palm)

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20
Q

Adductor Pollicis Origin

A

Oblique head: base of MC #2 and #3; Capitate bone

Transverse Head: Anterior Surface of shaft of MC #3

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21
Q

Adductor Pollicis Insertion

A

Medial side, base of proximal phalanx and extensor hood of thumb; sesamoid bone at head of 1st metacarpal

22
Q

Adductor Pollicis Innervation

A

Deep branch of ulnar nerve (C8/T1)

23
Q

Adductor Pollicis Action

A

Thumb Adduction

24
Q

Muscles of the Hypothenar Eminence

A
  1. Abductor Digiti Minimi
  2. Flexor Digiti Minimi Brevis
  3. Opponens Digiti Minimi
25
Q

Abductor Digiti Minimi Origin

A

Pisiform bone, tendon of Flexor Carpi Ulnars, and pisohamate ligament

26
Q

Abductor Digiti Minimi Insertion

A

Medial side, base of proximal phalanx of little finger, DDE

27
Q

Abductor Digiti Minimi Innervation

A

Deep branch of ulnar nerve (C8/T1)

28
Q

Abductor Digiti Minimi Action

A

Abduction of little finger

29
Q

Flexor Digiti Minimi Brevis Origin

A

Flexor retinaculum and hook of hamate

30
Q

Flexor Digiti Minimi Brevis Insertion

A

Medial side, base of proximal phalanx of little finger

31
Q

Flexor Digiti Minimi Brevis Innervation

A

Deep branch of Ulnar nerve (C8/T1)

32
Q

Flexor Digiti Minimi Brevis Action

A

Flexion of the little finger at MP joint

33
Q

Opponens Digiti Minimi Origin

A

Flexor retinaculum and hood of hamate

34
Q

Opponens Digiti Minimi Insertion

A

Medial margin and palmar surface of shaft of #5 MC

35
Q

Opponens Digiti Minimi Innervation

A

Deep branch of Ulnar Nerve (C8/T1)

36
Q

Opponens Digiti Minimi Action

A

Draws 5th finger forward and rotates it laterally for opposition

37
Q

Intrinsic muscles of the hand (not part of the Thenar and hypothenar eminence)

A 
Adductor pollicis
Palmaris Brevis
Lumbricals
Dorsal Interossei
palmar Interossei
38
Q

Palmaris Brevis Origin

A

Flexor retinaculum and palmar aponeurosis (medial margin)

39
Q

Palmaris Brevis Insertion

A

Skin on medial side of palm; Blends with fascia over hypothenar eminence (both attachments are soft)

40
Q

Palmaris Brevis Innervation

A

Superficial branch of ulnar nerve ( C8/T1)

41
Q

Palmaris Brevis Action

A

Tenses skin over hypothenar eminence and deepens the hallow of the hand

42
Q

Lumbricals Origin

A

Tendons of the Flexor Digitorum Profundus

  • # 1/2 are unipennate muscles: Lateral (Radial) side of FDP tendons to index and middle fingers
  • # 3/4 are bipennate muscles: Adjacent sides of FDP tendons to middle ring, and little finger
43
Q

Lumbricals Insertion

A

Lateral (radial Side) of the DDE to fingers 2, 3, 4, 5

44
Q

Lumbricals Innervation

A 
#1/#2 by Median Nerve (Common Palmar digital branches)
#3/4 by deep Branch of Ulnar Nerve (all C8-T1)
45
Q

Lumbricals Action

A

MP flexion, PIP and DIP extension of fingers 2-5

46
Q

Dorsal Interossei Origin (Bipennate)

A

Adjacent Sides of 2 MC Bones

47
Q

Dorsal Interossei Insertion

A

Base of proximal phalanx of fingers 2,3,4 and DDE:

#1: Lateral side of index finger
#2: Lateral side of middle finger
#3: Medial Side of middle finger
#4: medial side of ring finger
48
Q

Dorsal Interossei Innervation

A

Deep branch of nerve (C8/T1)

49
Q

Dorsal Interossei Action

A

Abduction of Fingers #2-4 at MP joints; MP Flexion, IP Extension via DDE and digits 2-4

50
Q

Palmar/Volar Inerossei Origin

A

Palmar shaft surface of MC 1, 2, 4, and 5

Medial Side: #1, 2
Lateral side: #4, 5

51
Q

Palmar/Volar Inerossei Insertion

A

Base proximal phalanx, fingers 1, 2, 4, and 5 and DDE

  • Fingers 1-2 on medial Side
  • Fingers 4-5 on Lateral side
52
Q

Palmar/Volar Inerossei Innervation

A

Deep branch of ulnar nerve (C8-T1)

Anatomy (18 decks)

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