Muscels of the forearm ( palm and dorsal)

Question 1

What are lumbricals ?

Answer 1

Four muscles that look like worms

Question 2

Origin of lumbricals

Answer 2

Tendons of the Flexor digitorum profundus muscles

Question 3

Insertion of lumbricals

Answer 3

Lateral sides of the extensor hoods

Question 4

Action of lumbricals

Answer 4

• Flexion at the metacarpophalangeal joints
  
  • Extends the dorsal interphalangeal joints

Question 5

Innervation of lumbricals

Answer 5

• Lateral two lumbricals by the median nerve
  
  • Medial two lumbricals by the ulnar nerve

Question 6

Origin of Abductor pollicis brevis muscle (Thenar)

Answer 6

• Tubercle of the trapezium and scaphoid
  
  • Adjacent flexor retinaculum

Question 7

Insertion of Abductor pollicis brevis muscle (Thenar)

Answer 7

Proximal phalanx and extensor hood of thumb

Question 8

Action of Abductor pollicis brevis muscle (Thenar)

Answer 8

Abducts the thumb at the metacarpophalangeal joint

Question 9

Innervation of Abductor pollicis brevis muscle (Thenar)

Answer 9

Recurrent branch of the median nerve

Question 10

Origin of flexor pollicis brevis muscle (Thenar)

Answer 10

Tubercle of the trapezium and the flexor retinaculum

Question 11

Insertion of flexor pollicis brevis muscle (Thenar)

Answer 11

Proximal phalanx of the thumb

Question 12

Action of flexor pollicis brevis muscle (Thenar)

Answer 12

Flexes thumb at metacarpophalangeal joint

Question 13

Innervation of flexor pollicis brevis muscle (Thenar)

Answer 13

Recurrent branch of the median nerve

Question 14

Origin of opponens pollicis muscle

Answer 14

Tubercle of the trapezium and the flexor retinaculum

Question 15

Insertion of opponens pollicis muscle

Answer 15

Lateral margin and palmar surface of the 1st metacarpal

Question 16

Action of opponens pollicis muscle

Answer 16

Medially rotates the thumb

Question 17

Innervation of opponens pollicis muscle

Answer 17

Recurrent branch of the median nerve

Question 18

Origin of adductor pollicis muscle

Answer 18

• Oblique head
  
  • Capitate and Bases of 2nd and 3rd metacarpals
  • Transverse head
    
    • Anterior surface of the shaft of the 3rd metacarpal

Question 19

Insertion of adductor pollicis muscle

Answer 19

• Base of the proximal phalanx of the thumb
  
  • Extensor hood of the thumb

Question 20

Action of adductor pollicis muscle

Answer 20

Adducts the thumb

Question 21

Innervation of adductor pollicis muscle

Answer 21

Deep branch of the ulnar nerve

Question 22

Origin of abductor digit minimi muscle (hypothenar)

Answer 22

• Pisiform and the pisohamate ligament
  
  • Tendon of the flexor carpi ulnaris muscle

Question 23

Insertion of abductor digit minimi muscle (hypothenar)

Answer 23

Proximal phalanx of the little finger

Question 24

Action of abductor digit minimi muscle (hypothenar)

Answer 24

Abducts little finger at metacarpophalangeal joint

Question 25

Innervation of abductor digit minimi muscle (hypothenar)

Answer 25

Deep branch of the ulnar nerve

Question 26

Origin of flexor digit minimi muscle (hypothenar)

Answer 26

Hook of the hamate and the flexor retinaculum

Question 27

Insertion of flexor digit minimi muscle (hypothenar)

Answer 27

Proximal phalanx of the little finger

Question 28

Action of flexor digit minimi muscle (hypothenar)

Answer 28

Flexes little finger at the metacarpophalangeal joint

Question 29

Innervation of flexor digit minimi muscle (hypothenar)

Answer 29

Deep branch of the ulnar nerve

Question 30

Origin of opponens digit minimi muscle (hypothenar)

Answer 30

Hook of the hamate and the flexor retinaculum

Question 31

Insertion of opponens digit minimi muscle (hypothenar)

Answer 31

Medial aspect of the 5th metacarpal

Question 32

Action of opponens digit minimi muscle (hypothenar)

Answer 32

Laterally rotates of the 5th metacarpal

Question 33

Innervation of opponens digit minimi muscle (hypothenar)

Answer 33

Deep branch of the ulnar nerve

Question 34

Origin of palmar interosseus muscles

Answer 34

Sides of the metacarpals

Question 35

Insertion of palmar interosseus muscles

Answer 35

- Extensor hoods of the index, ring and little fingers - Proximal phalanx of the index, ring and little fingers

Question 36

Action of palmar interosseus muscles

Answer 36

- Adduction of the index, ring and little fingers - Extension at the dorsal interphalangeal joints

Question 37

Innervation of palmar interosseus muscles

Answer 37

Deep branch of the ulnar nerve

Question 38

Origin of dorsal interosseus muscles

Answer 38

Adjacent metacarpals

Question 39

Insertion of dorsal interosseus muscles

Answer 39

- Extensor hoods of the index, ring and middle fingers - Proximal phalanx of the index, ring and middle fingers

Question 40

Action of dorsal interosseus muscles

Answer 40

- Abduction of the index, ring and middle fingers - Extension at the dorsal interphalangeal joints

Question 41

Innervation of