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Anatomy Sem One > Intrinsic muscles of the hand > Flashcards

Intrinsic muscles of the hand Flashcards

1
Q

Palmaris brevis

A

Origin:

  • Palmar aponeruosis and flexor retinaculum

Insertion:

  • Dermis of skin on the medial margin of the hand

Innervation:

  • Superficial branch of the ulnar nerve (C8, T1)

Function:

  • Improves grip
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2
Q

Dorsal interossei (four muscles)

A

Origin:

  • Adjacent sides of the metacarpals

Insertion:

  • Extensor hood and base of proximal phalanges of index, middle and ring fingers

Innervation:

  • Deep branch of ulnar nerves (C8, T1)

Function:

  • Abduction of index, middle and ring fingers at the metacarpophalangeal joints
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3
Q

Palmar interossei

A

Origin:

  • Sides of metacarpals

Insertion:

  • Extensor hoods of the thumb, index, ring and little fingers and the proximal phalanx of thumb

Innervation:

  • Deep branch of ulnar nerve (C8, T1)

Function:

  • Adduction of the thumb, index, ring, and little fingers at the metacarpophalangeal joints
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4
Q

Adductor pollicis

A

Origin:

  • Transverse head - metacarpal III;
  • Oblique head - capitate and bases of metacarpals II and III

Insertion:

  • Base of proximal phalanx and extensor hood of thumb

Innervation:

  • Deep branch of ulnar nerves (C8, T1)

Function:

  • Adducts thumb
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5
Q

Lumbricals

A

Origin:

  • Tendons of flexor digitorum profundus

Insertion:

  • Extensor hoods of index, ring, middle and little fingers

Innervation:

  • Medial two by the deep branch of the ulnar nerve;
  • lateral two by digital branches of the median nerve

Function:

  • Flex metacarpophalangeal joints while extending interphalangeal joints
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6
Q

Opponens pollicis (thenar muscle)

A

Origin:

  • Tubercles of trapezium and flexor retinaculum

Insertion:

  • Lateral margin and adjacent palmar surface of metacarpal I

Innervation:

  • Recurrent branch of median nerve (C8, T1)

Function:

  • Medially rotates thumb
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7
Q

Abductor pollicis brevis

A

Origin:

  • Tubercles of scaphoid and trapezium and adjacent flexor retinaculum

Insertion:

  • Proximal phalanx and extensor hood of thumb

Innervation:

  • Recurrent branch of median nerve (C8, T1)

Function:

  • Abducts thumb at metacarpophalangeal joint
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8
Q

Flexor pollicis brevis

A

Origin:

  • Tubercle of the trapezium and flexor retinaculum

Insertion:

  • Proximal phalanx of the thumb

​

Innervation:

  • Recurrent branch of median nerve (C8, T1)

Function:

  • Flexes thumb at metacarpophalangeal joint
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9
Q

Opponens digiti minimi

A

Origin:

  • Hook of hamate and flexor retinaculum

Insertion:

  • Medial aspect of metacarpal V

Innervation:

  • Deep branch of ulnar nerve (C8, T1)

Function:

  • Laterally rotates metacarpal V
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10
Q

Abductor digiti minimi

A

Origin:

  • Pisiform, the pisohamate ligament, and tendon fo flexor carpi ulnaris

Insertion:

  • Proximal phalanx of little finger

Innervation:

  • Deep branch of ulnar nerve (C8, T1)

Function:

  • Abducts little finger at metacarpophalangeal joint
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11
Q

Flexor digiti minimi brevis

A

Origin:

  • Hook of hamate and flexor retinaculum

Insertion:

  • Proximal phalanx of little finger

Innervation:

  • Deep branch of ulnar nerve (C8, T1)

Function:

  • Flexes little finger at metacarpophalangeal joint
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12
Q

Origin:

  • Palmar aponeruosis and flexor retinaculum

Insertion:

  • Dermis of skin on the medial margin of the hand

Innervation:

  • Superficial branch of the ulnar nerve (C8, T1)

Function:

  • Improves grip
A

Palmaris brevis

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13
Q

Origin:

  • Adjacent sides of the metacarpals

Insertion:

  • Extensor hood and base of proximal phalanges of index, middle and ring fingers

Innervation:

  • Deep branch of ulnar nerves (C8, T1)

Function:

  • Abduction of index, middle and ring fingers at the metacarpophalangeal joints
A

Dorsal interossei (four muscles)

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14
Q

Origin:

  • Sides of metacarpals

Insertion:

  • Extensor hoods of the thumb, index, ring and little fingers and the proximal phalanx of thumb

Innervation:

  • Deep branch of ulnar nerve (C8, T1)

Function:

  • Adduction of the thumb, index, ring, and little fingers at the metacarpophalangeal joints
A

Palmar interossei

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15
Q

Origin:

  • Transverse head - metacarpal III;
  • Oblique head - capitate and bases of metacarpals II and III

Insertion:

  • Base of proximal phalanx and extensor hood of thumb

Innervation:

  • Deep branch of ulnar nerves (C8, T1)

Function:

  • Adducts thumb
A

Adductor pollicis

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16
Q

Origin:

  • Tendons of flexor digitorum profundus

Insertion:

  • Extensor hoods of index, ring, middle and little fingers

Innervation:

  • Medial two by the deep branch of the ulnar nerve;
  • lateral two by digital branches of the median nerve

Function:

  • Flex metacarpophalangeal joints while extending interphalangeal joints
A

Lumbricals

17
Q

Origin:

  • Tubercles of trapezium and flexor retinaculum

Insertion:

  • Lateral margin and adjacent palmar surface of metacarpal I

Innervation:

  • Recurrent branch of median nerve (C8, T1)

Function:

  • Medially rotates thumb
A

Opponens pollicis (thenar muscle)

18
Q

Origin:

  • Tubercles of scaphoid and trapezium and adjacent flexor retinaculum

Insertion:

  • Proximal phalanx and extensor hood of thumb

Innervation:

  • Recurrent branch of median nerve (C8, T1)

Function:

  • Abducts thumb at metacarpophalangeal joint
A

Abductor pollicis brevis

19
Q

Origin:

  • Tubercle of the trapezium and flexor retinaculum

Insertion:

  • Proximal phalanx of the thumb

​

Innervation:

  • Recurrent branch of median nerve (C8, T1)

Function:

  • Flexes thumb at metacarpophalangeal joint
A

Flexor pollicis brevis

20
Q

Origin:

  • Hook of hamate and flexor retinaculum

Insertion:

  • Medial aspect of metacarpal V

Innervation:

  • Deep branch of ulnar nerve (C8, T1)

Function:

  • Laterally rotates metacarpal V
A

Opponens digiti minimi

21
Q

Origin:

  • Pisiform, the pisohamate ligament, and tendon fo flexor carpi ulnaris

Insertion:

  • Proximal phalanx of little finger

Innervation:

  • Deep branch of ulnar nerve (C8, T1)

Function:

  • Abducts little finger at metacarpophalangeal joint
A

Abductor digiti minimi

22
Q

Origin:

  • Hook of hamate and flexor retinaculum

Insertion:

  • Proximal phalanx of little finger

Innervation:

  • Deep branch of ulnar nerve (C8, T1)

Function:

  • Flexes little finger at metacarpophalangeal joint
A

Flexor digiti minimi brevis

Anatomy Sem One (46 decks)

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