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

Anatomy - Forearm, Wrist, & Hand - Extensors Flashcards

(68 cards)

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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
Juncturae Tendinae
Interconnecting bands between ED tendons just proximal to insertion at MCP joints. Restricts independent finger extension.
26
Extensor Digiti Minimi - Proximal Attachment(s)
Lateral epicondyle
27
Extensor Digiti Minimi - Distal Attachment(s)
Extensor hood of 5th digit (medial to ED)
28
Extensor Digiti Minimi - Innervation
Deep branch radial C7, C8
29
Extensor Digiti Minimi - Action
Extend MCP and PIP of 5th digit & can assist with wrist extension after 5th MCP extended
30
Extensor Digiti Minimi - Dorsal Compartment
5th
31
Supinator - Proximal Attachment(s)
Lateral epicondyle, annular ligament, ulnar collateral ligament, & supinator crest of ulna
32
Supinator - Distal Attachment(s)
Lateral, anterior, & posterior surfaces of the radius (along with brachial is forms floor of cubital fossa)
33
Supinator - Innervation
Deep branch radial nerve C7, C8
34
Supinator - Action
Supinate forearm
35
ABdutor Pollicis Longus - Proximal Attachment(s)
Posterior surfaces of ulna, radius, & interosseous membrane
36
ABdutor Pollicis Longus - Distal Attachment(s)
Lateral base of 1st MC (passes over ECRL & ECRB)
37
ABdutor Pollicis Longus - Innervation
PIN C7, C8
38
ABdutor Pollicis Longus - Action
ABduct and extend thumb at 1st CMC & assist in radial deviation
39
ABdutor Pollicis Longus - Dorsal Compartment
1st
40
Extensor Pollicis Brevis - Proximal Attachment(s)
Posterior surface of radius & IM
41
Exensor Pollicis Brevis - Distal Attachment(s)
Lateral side of P1 of 1st digit (passes over ECRL & ECRB)
42
Extensor Pollicis Brevis - Innervation
PIN C7, C8
43
Extensor Pollicis Brevis - Action
Extends thumb at 1st MCP & assist in radial deviation
44
Extensor Pollicis Brevis - Dorsal Compartment
1st
45
Extensor Pollicis Longus - Proximal Attachment(s)
Posterior surface of middle 1/3 of ulna & IM
46
Extensor Pollicis Longus - Distal Attachment(s)
DP of 1st digit (deviates around Lister's tubercle)
47
Extensor Pollicis Longus - Innervation
PIN C7, C8
48
Extensor Pollicis Longus - Action
Extend 1st digit DP at IP & assist in thumb ADduction
49
Extensor Pollicis Longus - Dorsal Compartment
3rd
50
Extensor Indicis - Proximal Attachment(s)
Posterior surface of ulna & IM
51
Extensor Indicis - Distal Attachment(s)
Extensor expansion of 2nd digit
52
Extensor Indicis - Innervation
PIN C7, C8
53
Extensor Indicis - Action
Extend 2nd digit at MCP (allows for independent extension as does EDM for 5th digit)
54
Extensor Indicis - Dorsal Compartment
4th (lies ulnar to ED)
55
Boutonniere Deformity
Central band/slip broken --> FDS over-powers so extreme flexion @ PIP --> Lateral bands slip velar & assist PIP flexion
56
Swan Neck Deformity
FDS cut OR extensor forces dominate -> PIP hyperextension & DIP flexion --> Distal lateral bands slackened & unable to extend DIP
57
Mallet Deformity
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
Extensor Tendon Injury Zone 1 & 2
Terminal extensor tendon --> Mallet Deformity
59
Extensor Tendon Injury Zone 3 & 4
Hood proximal to PIP --> Boutonniere Deformity
60
Extensor Tendon Injury Zone 5
ED tendon distal to juncturae tendonae
61
Extensor Tendon Injury Zone 6
ED tendon proximal to juncturae tendonae
62
Extensor Tendon Injury Zone 7
In extensor retinaculum
63
Extensor Tendon Injury Zone 8
Tendons proximal to extensor retinaculum
64
Median Nerve PSEs
Ligament of Struthers (rare), between heads of Pronator Teres, Fascial band between heads of FDS (AIN), & Carpal Tunnel (most common)
65
Ulnar Nerve PSEs
Medial intermuscular septum, Medial epicondyle, Cubital tunnel (between heads of FCU), & Guyon's Canal
66
Radial Nerve PSEs
Spiral groove, Lateral intermuscular septum, & Arcade of Froshe
67
Basilic Vein
Ascends on dorsomedial forearm, winds anteriorly in proximal forearm, & penetrates deep to join brachial vein in distal arm
68
Cephalic Vein
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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