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Anatomy > 21. Posterior Forearm and Dorsum of Hand > Flashcards

21. Posterior Forearm and Dorsum of Hand Flashcards

1
Q

Origin of anconeus?

A

Lateral epicondyle of humerus

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2
Q

Insertion of anconeus?

A

Olecranon of ulna

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3
Q

Function of anconeus?

A

Weak extensor of elbow

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4
Q

Innervation of anconeus?

A

Radial nerve C7-C8

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5
Q

Origin of brachioradialis?

A

Distal humerus (supra-epicondylar ridge)

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6
Q

Insertion of brachioradialis?

A

Radius (proximal to styloid process)

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7
Q

Function of brachioradialis?

A

Flexion of elbow (especially when forearm is semi-prone)

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8
Q

Innervation of brachioradialis?

A

Radial nerve C5-C7

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9
Q

Where is the common extensor origin?

A

Lateral epicondyle of the humerus

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10
Q

Origin of extensor carpi radialis longus?

A

Distal humerus (supra-epicondylar ridge)

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11
Q

Insertion of extensor carpi radialis longus?

A

Base of 2nd metacarpal

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12
Q

Function of extensor carpi radialis longus?

A

Wrist extension and abduction

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13
Q

Innervation of extensor carpi radialis longus?

A

Radial nerve C6, C7

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14
Q

Origin of extensor carpi radialis brevis?

A

Lateral epicondyle of humerus

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15
Q

Insertion of extensor carpi radialis brevis?

A

Base of 3rd metacarpal

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16
Q

Function of extensor carpi radialis brevis?

A

Wrist extension and abduction

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17
Q

Innervation of extensor carpi radialis brevis?

A

Posterior interosseous branch of radial nerve C7, C8

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18
Q

Origin of extensor carpi ulnaris?

A

Lateral epicondyle of humerus

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19
Q

Insertion of extensor carpi ulnaris?

A

Base of 5th metacarpal

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20
Q

Function of extensor carpi ulnaris?

A

Wrist extension and adduction (when working with flexor carpi ulnaris)

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21
Q

Innervation of extensor carpi ulnaris?

A

Posterior interosseous branch of radial C7, C8

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22
Q

Origin of extensor digitorum?

A

Lateral epicondyle of humerus

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23
Q

Insertion of extensor digitorum?

A

Dorsal expansion of digits 2-5

24
Q

Function of extensor digitorum?

A

Extension of MCP and IP of digits 2-5

25
Q

Innervation of extensor digitorum?

A

Posterior interosseous branch of radial nerve C7-C8

26
Q

Origin of extensor digiti minimi?

A

Lateral epicondyle of humerus

27
Q

Insertion of extensor digit minimi?

A

Dorsal expansion of 5th digit

28
Q

Function of extensor digit minimi?

A

Extension of MCP and IP joints of little finger

29
Q

Innervation of extensor digit minimi?

A

Posterior interosseous branch of radial nerve C7-C8

30
Q

Origin of extensor indices?

A

Posterior surface of ulna and interosseous membrane

31
Q

Insertion of extensor indices?

A

Dorsal expansion of digit 2

32
Q

Function of extensor indices?

A

Extension of MCP and IP at index finger

Also wrist flexion

33
Q

Innervation of extensor indices?

A

Posterior interosseous branch of radial nerve C7, C8

34
Q

Origin of extensor pollicis longus?

A

Ulna and interosseous membrane

35
Q

Insertion of extensor pollicis longus?

A

Base of distal phalanx of thumb

36
Q

Function of extensor pollicis longus?

A

CMC, MCP and IP extension of thumb

Extension of wrist

37
Q

Innervation of extensor pollicis longus?

A

Posterior interosseous branch of radial nerve C7, C8

38
Q

Origin of extensor pollicis brevis?

A

Radius and interossous membrane

39
Q

Insertion of extensor pollicis brevis?

A

Base of proximal phalanx of thumb

40
Q

Function of extensor pollicis brevis?

A

CMC and MCP thumb joint extension

Extension of wrist

41
Q

Innervation of extensor pollicis brevis?

A

Posterior interosseous branch of radial nerve C7, C8

42
Q

Origin of abductor pollicis longus?

A

Radius
Interosseous membrane
Ulna

43
Q

Insertion of abductor pollicis longus?

A

Base of 1st metacarpal

44
Q

Function of abductor pollicis longus?

A

Abducts thumb and extends it at the CMC joint

Extends wrist

45
Q

Innervation of abductor pollicis longus?

A

Posterior interosseous branch of radial nerve C7-C8

46
Q

Origin of supinator?

A

Crest of ulna
Lateral epicondyle of humerus
Radial collateral
Annular ligament of radius

47
Q

Insertion of supinator?

A

Proximal 1/3rd of lateral radius

48
Q

Function of supinator?

A

Supination of forearm by ‘rolling’ the radius

49
Q

Innervation of supinator?

A

Posterior interosseous branch of radial nerve C7, C8

50
Q

Through the heads of which muscle does radial nerve pass?

A

Supinator

51
Q

Through the heads of which muscle does ulnar nerve pass?

A

Extensor carpi ulnaris

52
Q

Where does the brachial artery become the radial artery?

A

In cubital fossa

53
Q

What vein runs with the radial nerve?

A

Cephalic vein

54
Q

What muscles make up the anatomical snuffbox?

A

ABL

Abductor pollicis longus
Extensor pollicis brevis
Extensor pollicis longus

55
Q

What is the dorsal expansion?

A

Strong connective tissue

Allows the long flexors and short muscles of the hand to act on all three finger joints

Anatomy (49 decks)

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