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MD1S1: Anatomy 201 > Extensors of the Forearm > Flashcards

Extensors of the Forearm Flashcards

1
Q

What are the layers of the extensors of the forearm?

A

Superficial layer
Deep layer

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2
Q

What are the groups of muscles of the superficial layer?

A

Lateral group:
* Brachioradialis (1)
* Extensor carpi radialis longus (2)
* Extensor carpi radialis brevis (3)
* Extensor digitorum (4)
* Extensor digiti minimi (5)

Medial group:
* Extensor carpi ulnaris (6)
* Anconeus (7)

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3
Q

Origin of the brachioradialis

Lateral group

A

Upper part of lateral supra-condylar ridge of humerus

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4
Q

Insertion of the brachioradialis

A

Base of styloid process of radius

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5
Q

Action of the brachioradialis

A

Accessory flexor of elbow joint when forearm is mid-pronated

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6
Q

Nerve supply of the brachioradialis

A

Radial nerve

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7
Q

Origin of the extensor carpi radialis longus

Lateral group

A

Lower part of lateral supra-condylar ridge of humerus

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8
Q

Insertion of the extensor carpi radialis longus

A

Dorsal surface of base of metacarpal 2

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9
Q

Action of extensor carpi radialis longus

A

Extends and abducts the wrist

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10
Q

Nerve supply of the extensor carpi radialis longus

A

Radial nerve

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11
Q

Origin of extensor carpi radialis brevis

Lateral group

A

Lateral epicondyle of humerus

The lateral epicondyle of the humerus in the common extensor origin

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12
Q

Insertion of the extensor carpi radialis brevis

A

Dorsal surface of base of metacarpal 3

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13
Q

Action of the extensor carpi radialis brevis

A

Extends and abducts the wrist

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14
Q

Nerve supply of the extensor carpi radialis brevis

A

Deep branch of the radial nerve

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15
Q

Origin of the extensor digitorum

Lateral group

A

Lateral epicondyle of humerus

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16
Q

Insertion of extensor digitorum

A

Four tendons, into the dorsal aspects of the bases of the middle and distal phalanges of the medial 4 fingers

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17
Q

Action of the flexor digitorum

A
  • Extends the inter-phalangeal joints of the medial 4 fingers
  • Extends the metacapo-phalangeal joints
  • Extends the wrist
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18
Q

Nerve supply of the extensor digitorum

A

Posterior interosseous branch of radial nerve

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19
Q

Origin of the extensor digiti minimi

Lateral group

A

Lateral epicondyle of humerus

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20
Q

Insertion of extensor digiti minimi

A

Extensor expansion of little finger

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21
Q

Action of extensor digiti minimi

A

Extends the little finger

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22
Q

Nerve supply of the extensor digiti minimi

A

Posterior interosseous nerve

23
Q

Origin of extensor carpi ulnaris

(Medial group)

A

Lateral epicondyle of humerus and posterior border of ulna

24
Q

Insertion of extensor carpi ulnaris

A

Base of metacarpal 5

25
Q

Action of extensor carpi ulnaris

A

Extends and adducts the wrist

26
Q

Nerve supply of extensor carpi ulnaris

A

Posterior interosseous nerve

27
Q

Origin of anconeous

(Medial group)

A

Posterior surface of lateral epicondyle of humerus

28
Q

Insertion of the anconeous

A

Olecranon and upper posterior surface of ulna

29
Q

Action of anconeous

A
  • Extensor of the elbow joint
  • Abduction of ulna in pronation
30
Q

Nerve supply of anconeous

A

Radial nerve

31
Q

Deep layer muscles in extensor compartment of the forearm

A
  • Supinator
  • Abductor pollicis longus
  • Extensor pollicis longus
  • Extensor pollicis brevis
  • Extensor indicis
32
Q

Origin of supinator

A

Lateral epicondyle of humerus & supinator crest of the ulna

33
Q

Insertion of supinator

A

Lateral surface of radius above the oblique
line

34
Q

Action of supinator

A

Supination

35
Q

Nerve supply of supinator

A

Posterior interosseous nerve

36
Q

Origin of abductor pollicis longus

A

Upper part of posterior surfaces of ulna and radius

37
Q

Insertion of abductor pollicis longus

A

Lateral side of base of metacarpal 1

38
Q

Action of abductor pollicis longus

A

Abducts carpometacarpal joint of thumb

39
Q

Nerve supply of abductor pollicis longus

A

Posterior interosseous nerve

40
Q

Origin of extensor pollicis brevis

A

Middle of the posterior surface of radius

41
Q

Insertion of extensor pollicis brevis

A

Dorsal surface of base of proximal phalanx of the thumb

42
Q

Action of extensor pollicis brevis

A

Extends metacarpo-phalangeal joint of the thumb; also extend the carpo-metacarpal joint of the thumb

43
Q

Nerve supply of extensor pollicis brevis

A

Posterior interosseous nerve

44
Q

Origin of extensor pollicis longus

A

Middle of the posterior surface of ulna

45
Q

Insertion of extensor pollicis longus

A

Dorsal surface of base of distal phalanx of thumb

46
Q

Action of extensor pollicis longus

A

Extends inter-phalangeal joint of the thumb
Extends metacarpo-phalangeal joints of the thumb
Extend carpo-metacarpal joints of the thumb

47
Q

Nerve supply of extensor pollicis longus

A

Posterior interosseous nerve

48
Q

Origin of the extensor inidicis

A

Lower part of posterior surace of ulna

49
Q

Insertion of extensor inidicis

A

Extensor expansion of index finger

50
Q

Action of extensor indicis

A

Extends index finger

51
Q

Nerve supply of extensor indicis

A

Posterior interosseous nerve

52
Q

What is the extensor retinaculum?

A

Thickening of the deep fascia on the
dorsum of the wrist

53
Q

What is the function of the extensor retinaculum?

A

It holds the long extensor tendons in position

54
Q

What is the attachment of the extensor retinaculum?

A

Medially to the triquetrum & pisiform bones and laterally to the lower part of the anterior border of radius

MD1S1: Anatomy 201 (24 decks)

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