Muscles of Hand

Question 1

Answer 1

Abductor Pollicis Brevis

• O: Tuburcle of trapezium & scaphoid, flexor retinaculum
• I: base of the proximal phalanx of the thumb, radial side
• A: abduction of thumb @ CMC, MCP
• N: Median Nerve C8, T1

Question 2

Answer 2

Flexor Pollicis Brevis

• O: Flexor retinaculum & trapezium bone
• I: base of proximal phalanx of thumb
• A: flexion of thumb @ CMC MCP ( assists in opposition of thumb
• N: median nerve

Question 3

Answer 3

Opponens Pollicis

• O: flexor retinaculum and tuberlce of the trapezium
• I: metacarple of thumb (anterolateral side)
• A: opposition of thumb @ CMC
• N: median nerve

Question 4

Answer 4

Abductor Digiti Minimi

• O: tendon of the FCU & pisiform bone
• I: by 2 slips, at the base of the priximal phalanx of little finger & into the ulnar border of the extansor expansion
• A: Abduction of the little finger @CMC, MCP
• N: Ulnar nerve

Question 5

Answer 5

Flexor Digiti Minimi

• O: Hook of hamate bone & the flexor retinaculum
• I: base of the proximal phalanx of the little finger
• A: flexion of pinky @MCP assists in opposition of the little finger toward thumb
• N: ulnar nerve

Question 6

Answer 6

Opponens Digiti Minimi

• O: hook of hamate & flexor retinaculum
• I: entire length of the 5th MC bone
• A:opposition of pinky @ CMC
• N: ulnar nerve

Question 7

Answer 7

Palmaris Brevis

• O: Ulnar border of the palmaris aponeurosis and palmar surface of the flexor retinaculum
• I: skin on the ulnar border of hand
• A: corrugates the skin on medial side ( used in a grip action)
• N: ulnar nerve

Question 8

Answer 8

Adductor pollicis

• O: oblique head: capitate bone & bases of 2nd & 3rd metacarple bones
  
  • transverse head: palmar surface of 3rd meta bone
• I: base of proximal phalanx of thumb
• A: adduction of thumb @ CMC
• N: ulnar nerve

Question 9

Answer 9

Lumbricals x4

• O: 1-2: radial surface of FDP tendons index & middle
  
  • 3: adjacent sides FDP tendons middle & ring
  • 4: adjacents sides of the FDP tendons ring & pinky
• I: radial border of extensor expansion on dorsum of digits
• A: flexion of MCP & extension IP
• N: lateral 2: median
  
  • medial 2: ulnar

Question 10

Answer 10

Palmar interossei x3

• O: Metacarpals 2,4,5
• I: base of proximal phalanx of digits 2,4,5 & extensor hood
• A: adduction of fingers (PAD) flexion of fingers MCP while IP is extended
• N: ulnar nerve

Question 11

Answer 11

Dorsal Interossei x4

• O: between each metacarpal
• I: base of proximal fingers 2-4 & extensor hood of same fingers
• A: abduction of fingers (DAP) flexion of fingers (MCP while IP are extended
• N: ulnar nerve