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Clinical Anatomy > Anatomy - Forearm, Wrist, & Hand - Extensors > Flashcards

Anatomy - Forearm, Wrist, & Hand - Extensors Flashcards

1
Q

Brachioradialis - Proximal Attachment(s)

A

Lateral supracondylar ridge

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2
Q

Brachioradialis - Distal Attachment(s)

A

Distal lateral radius (DOESN NOT cross wrist)

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3
Q

Brachioradialis - Innervation

A

Radial nerve C5, C6, C7

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4
Q

Brachioradialis - Action

A

Flexes forearm (DOES NOT AFFECT WRIST), pronate to midline, & supinate to midline

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5
Q

Extensor Carpi Radialis Longus - Proximal Attachment(s)

A

Lateral supracondylar ridge

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6
Q

Extensor Carpi Radialis Longus - Distal Attachment(s)

A

Dorsal base of 2nd MC

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7
Q

Extensor Carpi Radialis Longus - Innervation

A

Radial nerve C6, C7

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8
Q

Extensor Carpi Radialis Longus - Action

A

Extends wrist & radially deviates

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9
Q

Extensor Carpi Radialis Longus - Dorsal Compartment

A

2nd

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10
Q

Extensor Carpi Radialis Brevis - Proximal Attachment(s)

A

Lateral epicondyle (deep to ECRL & ED)

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11
Q

Extensor Carpi Radialis Brevis - Distal Attachment(s)

A

Dorsal base of 3rd MC

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12
Q

Extensor Carpi Radialis Brevis - Innervation

A

Deep branch radial nerve C7, C8

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13
Q

Extensor Carpi Radialis Brevis - Action

A

Extends wrist & supports during grasping

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14
Q

Extensor Carpi Radialis Brevis - Dorsal Comparment

A

2nd

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15
Q

Extensor Carpi Ulnaris - Proximal Attachment(s)

A

Lateral epicondyle & posterior border of ulna

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16
Q

Extensor Carpi Ulnaris - Distal Attachment(s)

A

Base of 5th MC (dorsolateral)

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17
Q

Extensor Carpi Ulnaris - Innervation

A

Deep branch radial nerve C7, C8

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18
Q

Extensor Carpi Ulnaris - Action

A

Extend wrist & ulnarly deviate (when forearm prone –> tendon is more lateral so it’s a better deviator & less of a wrist extensor)

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19
Q

Extensor Carpi Ulnaris - Dorsal Compartment

A

6th

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20
Q

Extensor Digitorum - Proximal Attachment(s)

A

Lateral epicondyle (between ECRB & ECU)

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21
Q

Extensor Digitorum - Distal Attachment(s)

A

Sagittal bands (around MCPs) of extensor hood & continues on through central slip; terminate at dorsal aspect of base of MPs 2-5

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22
Q

Extensor Digitorum - Innervation

A

Deep branch radial nerve C7, C8

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23
Q

Extensor Digitorum - Action

A

Extends MCPs of 2-5 & PIPs when MCPs in slight flexion; assist wrist extension

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24
Q

Extensor Digitorum - Dorsal Compartment

A

4th

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25
Q

Juncturae Tendinae

A

Interconnecting bands between ED tendons just proximal to insertion at MCP joints. Restricts independent finger extension.

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26
Q

Extensor Digiti Minimi - Proximal Attachment(s)

A

Lateral epicondyle

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27
Q

Extensor Digiti Minimi - Distal Attachment(s)

A

Extensor hood of 5th digit (medial to ED)

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28
Q

Extensor Digiti Minimi - Innervation

A

Deep branch radial C7, C8

29
Q

Extensor Digiti Minimi - Action

A

Extend MCP and PIP of 5th digit & can assist with wrist extension after 5th MCP extended

30
Q

Extensor Digiti Minimi - Dorsal Compartment

31
Q

Supinator - Proximal Attachment(s)

A

Lateral epicondyle, annular ligament, ulnar collateral ligament, & supinator crest of ulna

32
Q

Supinator - Distal Attachment(s)

A

Lateral, anterior, & posterior surfaces of the radius (along with brachial is forms floor of cubital fossa)

33
Q

Supinator - Innervation

A

Deep branch radial nerve C7, C8

34
Q

Supinator - Action

A

Supinate forearm

35
Q

ABdutor Pollicis Longus - Proximal Attachment(s)

A

Posterior surfaces of ulna, radius, & interosseous membrane

36
Q

ABdutor Pollicis Longus - Distal Attachment(s)

A

Lateral base of 1st MC (passes over ECRL & ECRB)

37
Q

ABdutor Pollicis Longus - Innervation

A

PIN C7, C8

38
Q

ABdutor Pollicis Longus - Action

A

ABduct and extend thumb at 1st CMC & assist in radial deviation

39
Q

ABdutor Pollicis Longus - Dorsal Compartment

40
Q

Extensor Pollicis Brevis - Proximal Attachment(s)

A

Posterior surface of radius & IM

41
Q

Exensor Pollicis Brevis - Distal Attachment(s)

A

Lateral side of P1 of 1st digit (passes over ECRL & ECRB)

42
Q

Extensor Pollicis Brevis - Innervation

A

PIN C7, C8

43
Q

Extensor Pollicis Brevis - Action

A

Extends thumb at 1st MCP & assist in radial deviation

44
Q

Extensor Pollicis Brevis - Dorsal Compartment

45
Q

Extensor Pollicis Longus - Proximal Attachment(s)

A

Posterior surface of middle 1/3 of ulna & IM

46
Q

Extensor Pollicis Longus - Distal Attachment(s)

A

DP of 1st digit (deviates around Lister’s tubercle)

47
Q

Extensor Pollicis Longus - Innervation

A

PIN C7, C8

48
Q

Extensor Pollicis Longus - Action

A

Extend 1st digit DP at IP & assist in thumb ADduction

49
Q

Extensor Pollicis Longus - Dorsal Compartment

50
Q

Extensor Indicis - Proximal Attachment(s)

A

Posterior surface of ulna & IM

51
Q

Extensor Indicis - Distal Attachment(s)

A

Extensor expansion of 2nd digit

52
Q

Extensor Indicis - Innervation

A

PIN C7, C8

53
Q

Extensor Indicis - Action

A

Extend 2nd digit at MCP (allows for independent extension as does EDM for 5th digit)

54
Q

Extensor Indicis - Dorsal Compartment

A

4th (lies ulnar to ED)

55
Q

Boutonniere Deformity

A

Central band/slip broken –> FDS over-powers so extreme flexion @ PIP –> Lateral bands slip velar & assist PIP flexion

56
Q

Swan Neck Deformity

A

FDS cut OR extensor forces dominate -> PIP hyperextension & DIP flexion –> Distal lateral bands slackened & unable to extend DIP

57
Q

Mallet Deformity

A

Terminal extensor tendons cut –> FDS over-powers –> DIP flexion (may lead to Swan Neck Deformity since ALL extensor forces now acting ONLY at PIP)

58
Q

Extensor Tendon Injury Zone 1 & 2

A

Terminal extensor tendon –> Mallet Deformity

59
Q

Extensor Tendon Injury Zone 3 & 4

A

Hood proximal to PIP –> Boutonniere Deformity

60
Q

Extensor Tendon Injury Zone 5

A

ED tendon distal to juncturae tendonae

61
Q

Extensor Tendon Injury Zone 6

A

ED tendon proximal to juncturae tendonae

62
Q

Extensor Tendon Injury Zone 7

A

In extensor retinaculum

63
Q

Extensor Tendon Injury Zone 8

A

Tendons proximal to extensor retinaculum

64
Q

Median Nerve PSEs

A

Ligament of Struthers (rare), between heads of Pronator Teres, Fascial band between heads of FDS (AIN), & Carpal Tunnel (most common)

65
Q

Ulnar Nerve PSEs

A

Medial intermuscular septum, Medial epicondyle, Cubital tunnel (between heads of FCU), & Guyon’s Canal

66
Q

Radial Nerve PSEs

A

Spiral groove, Lateral intermuscular septum, & Arcade of Froshe

67
Q

Basilic Vein

A

Ascends on dorsomedial forearm, winds anteriorly in proximal forearm, & penetrates deep to join brachial vein in distal arm

68
Q

Cephalic Vein

A

Proximal to wrist, winds to anterolateral forearm; ascends on anterolateral aspect of forearm & arm; at shoulder, lies in groove between deltoid & pec major; penetrates deep in deltopectoral triangle to join subclavian vein

Clinical Anatomy (8 decks)

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