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Anatomy: first med > The posterior forearm > Flashcards

The posterior forearm Flashcards

(64 cards)

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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
extensor digiti minimi action
extends little finger
26
extensor carpi ulnaris origin
lateral epicondyle of humerus
27
extensor carpi ulnaris insertion
base of metacarpal 5
28
extensor carpi ulnaris innervation
radial nerve
29
extensor carpi ulnaris action
extends and adducts hand at wrist
30
anconeus origin
lateral epicondyle of humerus
31
anconeus insertion
lateral side of olecranon and upper 1/4 of ulna's posterior surface
32
anconeus innervation
radial nerve
33
anconeus action
extends the forearm (assists triceps) tenses capsule of elbow joint to prevent pinching during extension
34
deep group muscles
- supinator - abductor pollicis longus - extensor pollicis brevis - extensor pollicis longus - extensor indicis
35
supinator origin
- ulnar head: supinator crest of ulna - humeral head: lateral epicondyle of humerus - ligaments of the elbow
36
supinator insertion
lateral surface of upper 1/3 of radius
37
supinator innervation
radial nerve
38
supinator action
supinates forearm
39
Extensor pollicis longus origin
posterior mid 1/3 of ulna and interosseus membrane
40
Extensor pollicis longus insertion
base of distal phalanx of thumb
41
Extensor pollicis longus innervation
radial nerve
42
Extensor pollicis longus action
extends thumb
43
how is Extensor pollicis longus held away from other thumb deep muscles?
by passing medially around the dorsal tubercle on the distal end of the radius
44
Extensor pollicis brevis origin
posterior surface of radius and interosseus membrane
45
Extensor pollicis brevis insertion
base of proximal phalanx of thumb
46
Extensor pollicis brevis innervation
radial nerve
47
Extensor pollicis brevis action
- extends and abducts thumb - contributes to lateral border of anatomical snuffbox
48
abductor pollicis longus origin
posterior surface of ulna middle 1/3 of posterior surface radius interosseus membrane
49
abductor pollicis longus insertion
base of metacarpal 1
50
abductor pollicis longus innervation
radial nerve
51
abductor pollicis longus action
- abducts and extends thumb - contributes to lateral border of anatomical snuffbox
52
extensor indicis origin
posterior surface of distal ulna and interosseus membrane
53
extensor indicis insertion
joins tendon of extensor digitorum to the 2nd digit inserting onto extensor expansion
54
extensor indicis innervation
radial nerve
55
extensor indicis action
extends index finger
56
3 muscles for wrist extension?
- extensor carpi radialis brevis - extensor carpi radialis longus - extensor carpi ulnaris
57
3 muscles for finger extension
- extensor digitorum - extensor indicis - extensor digiti minimi
58
3 muscle for thumb extension (and abduction)
- extensor pollicis longus - extensor pollicis brevis - abductor pollicis longus
59
what is the extensor retinaculum?
fibrous band holding extensor tendons to wrist all extensor tendons are surrounded by synovial sheaths underneath retinaculum
60
where is extensor retinaculum?
from lateral border of radius to carpal bone triquetrum and pisiform
61
medial border of anatomical snuffbox
extensor pollicis longus tendon
62
lateral anatomical snuffbox border
extensor pollicis brevis tendon abductor pollicis longus tendon
63
floor of anatomical snuffbox
scaphoid, trapezium
64
contents of anatomical snuffbox
radial artery

Anatomy: first med (17 decks)

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