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Anatomy: first med > The posterior forearm > Flashcards

The posterior forearm Flashcards

1
Q

Superficial muscles of posterior forearm

A
  • Brachioradialis
  • Extensor carpi radialis longus
  • Extensor carpi radialis brevis
  • Extensor digitorum
  • Extensor digiti minimi
  • Extensor carpi ulnaris
  • Anconeus
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2
Q

Which of posterior muscles is a flexor

A

Brachioradialis

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3
Q

Brachioradialis origin

A

lateral supracondylar ridge of humerus

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4
Q

Brachioradialis insertion

A

styloid process of radius

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5
Q

Brachioradialis innervation

A

radial nerve

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6
Q

Brachioradialis action

A

flexes forearm

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7
Q

what 3 muscles bend the elbow?

A
  • brachialis
  • biceps brachii
  • brachioradialis
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8
Q

what muscles extend the elbow?

A
  • triceps brachii
  • anconeus
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9
Q

extensor carpi radialis longus origin

A

lateral supracondylar ridge

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10
Q

extensor carpi radialis longus insertion

A

base of metacarpal 2

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11
Q

extensor carpi radialis longus innervation

A

radial nerve

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12
Q

extensor carpi radialis longus action

A

extends and abducts hand at wrist

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13
Q

extensor carpi radialis brevis origin

A

lateral epicondyle of humerus, common extensor origin

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14
Q

extensor carpi radialis brevis insertion

A

base of metacarpal 3

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15
Q

extensor carpi radialis brevis innervation

A

radial nerve

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16
Q

extensor carpi radialis brevis action

A

extends and abducts hand at wrist

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17
Q

extensor digitorum origin

A

lateral epicondyle of humerus

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18
Q

extensor digitorum insertion

A

extensor expansion of digits 2-5

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19
Q

extensor digitorum innervation

A

radial nerve

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20
Q

extensor digitorum action

A

extends digits 2-5

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21
Q

where is the extensor expansion

A

proximal phalanx

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22
Q

extensor digiti minimi origin

A

lateral epicondyle of humerus

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23
Q

extensor digiti minimi insertion

A

joins extensor digitorum tendon to 5th digit by inserting into extensor expansion

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24
Q

extensor digiti minimi innervation

A

radial nerve

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25
Q

extensor digiti minimi action

A

extends little finger

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26
Q

extensor carpi ulnaris origin

A

lateral epicondyle of humerus

27
Q

extensor carpi ulnaris insertion

A

base of metacarpal 5

28
Q

extensor carpi ulnaris innervation

A

radial nerve

29
Q

extensor carpi ulnaris action

A

extends and adducts hand at wrist

30
Q

anconeus origin

A

lateral epicondyle of humerus

31
Q

anconeus insertion

A

lateral side of olecranon and upper 1/4 of ulna’s posterior surface

32
Q

anconeus innervation

A

radial nerve

33
Q

anconeus action

A

extends the forearm (assists triceps)
tenses capsule of elbow joint to prevent pinching during extension

34
Q

deep group muscles

A
  • supinator
  • abductor pollicis longus
  • extensor pollicis brevis
  • extensor pollicis longus
  • extensor indicis
35
Q

supinator origin

A
  • ulnar head: supinator crest of ulna
  • humeral head: lateral epicondyle of humerus
  • ligaments of the elbow
36
Q

supinator insertion

A

lateral surface of upper 1/3 of radius

37
Q

supinator innervation

A

radial nerve

38
Q

supinator action

A

supinates forearm

39
Q

Extensor pollicis longus origin

A

posterior mid 1/3 of ulna and interosseus membrane

40
Q

Extensor pollicis longus insertion

A

base of distal phalanx of thumb

41
Q

Extensor pollicis longus innervation

A

radial nerve

42
Q

Extensor pollicis longus action

A

extends thumb

43
Q

how is Extensor pollicis longus held away from other thumb deep muscles?

A

by passing medially around the dorsal tubercle on the distal end of the radius

44
Q

Extensor pollicis brevis origin

A

posterior surface of radius and interosseus membrane

45
Q

Extensor pollicis brevis insertion

A

base of proximal phalanx of thumb

46
Q

Extensor pollicis brevis innervation

A

radial nerve

47
Q

Extensor pollicis brevis action

A
  • extends and abducts thumb
  • contributes to lateral border of anatomical snuffbox
48
Q

abductor pollicis longus origin

A

posterior surface of ulna
middle 1/3 of posterior surface radius
interosseus membrane

49
Q

abductor pollicis longus insertion

A

base of metacarpal 1

50
Q

abductor pollicis longus innervation

A

radial nerve

51
Q

abductor pollicis longus action

A
  • abducts and extends thumb
  • contributes to lateral border of anatomical snuffbox
52
Q

extensor indicis origin

A

posterior surface of distal ulna and interosseus membrane

53
Q

extensor indicis insertion

A

joins tendon of extensor digitorum to the 2nd digit inserting onto extensor expansion

54
Q

extensor indicis innervation

A

radial nerve

55
Q

extensor indicis action

A

extends index finger

56
Q

3 muscles for wrist extension?

A
  • extensor carpi radialis brevis
  • extensor carpi radialis longus
  • extensor carpi ulnaris
57
Q

3 muscles for finger extension

A
  • extensor digitorum
  • extensor indicis
  • extensor digiti minimi
58
Q

3 muscle for thumb extension (and abduction)

A
  • extensor pollicis longus
  • extensor pollicis brevis
  • abductor pollicis longus
59
Q

what is the extensor retinaculum?

A

fibrous band holding extensor tendons to wrist
all extensor tendons are surrounded by synovial sheaths underneath retinaculum

60
Q

where is extensor retinaculum?

A

from lateral border of radius to carpal bone triquetrum and pisiform

61
Q

medial border of anatomical snuffbox

A

extensor pollicis longus tendon

62
Q

lateral anatomical snuffbox border

A

extensor pollicis brevis tendon
abductor pollicis longus tendon

63
Q

floor of anatomical snuffbox

A

scaphoid, trapezium

64
Q

contents of anatomical snuffbox

A

radial artery

Anatomy: first med (17 decks)

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