Hand, Wrist & Forearm Anatomy Flashcards Preview

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Flashcards in Hand, Wrist & Forearm Anatomy Deck (39):
1

Intrinsic Muscles Innervated by Median Nerve

Abductor pollicus longus, opponens pollicis, flexor pollicus brevis (superficial head) & Lumbricals (of the radial side)

2

Abductor Pollicus Brevis

Origin: Scaphoid, trapezium, flexor retinaculum & tendon of abd pollicus longus
Insertion: base of prox phalanx, radial side of thumb
Fx: Palmar abd

3

Opponens Pollicus

Origin: Trapezium & flexor retinaculum
Insertion: First metacarpal
Fx: opposition

4

Flexor Pollicus Brevis

Origin: Trapezium, trapezoid, capitate & flexor retinaculum
Insertion: base of prox phalanx, radial side of thumb
Fx: thumn MCP flex - deep head innervated by ulnar nerve

5

Radial Side Lumbricals

Origin: tendons of flexor digitorium profund, index/mid fingers (radial/palmar sides)
Insertion: radial side of digits II & III into extensor expansion
Fx: MCP flex and IP extend

6

Intrinsic Muscles Innervated by Ulnar Nerve

Abductor digiti minimi, opponens digiti minimi, flexor digiti minimi, adductor, ulnar side lumbricals, palmar interossi & dorsal interossi

7

Abductor Digiti Minimi

Origin: Pisiform& tendon of flexor carpi ulnaris
Insertion: prox phalanx of 5th digit
Fx: Abduction of 5th digit

8

Opponens Digiti Minimi

Origin: hook of hamate and flex retinaculum
Insertion: 5th metacarpal
Fx: opposition of 5th digit

9

Adductor

Origin: oblique head: bases of 2/3rd metacarpal, trapezoid & capitate. transverse head: palmar border/shaft of 3rd metacarpal
Insertion: sesamoid, base of prox phalanx, tendon of ex pollicus longus
Fx: Adducts CMC joint of thumb

10

Ulnar Side Lumbricals

Origin: Tendons of flex digitorum profundus for 4/5th digit
Insertion: Radial side of 4/5th digits into extensor expansion
Fx: MCP flex/extension of 4/5th IP joints

11

Palmar Interossi

Origin: 1st - ulnar surface of 2nd metacarpal; 2nd - radial surface of 4th metacarpal: 3rd - radial surface of 5th metacarpal
Insertion: 1st - ulnar surface of 2nd prox phalanx; 2nd - radial surface of 4th prox phalanx: 3rd - radial surface of 5th prox phalanx
Fx: Adduction & assistance w MCP flex/exten of 2nd-5th IP joints

12

Dorsal Interossi

Origin: All 4 muscles arise from the adjacent sides of the metacarpals
Insertion: prox phalanx on radial aspect of index, radial/ulnar sides of mid, and ulnar side of ring - all into extensor digitorum
Fx: aBduction & assistance with MCP flex/exten of 2nd-5th IP joints

13

Extrinsic Flexor Muscles of the Hand Innervated by the Median Nerve

Flexor digitorum superficialis, flexor digitorum profundus & flexor pollicus longus

14

Flexor digitorum superficialis (FDS)

Origin: medial epicondyle
Insertion: mid phalanx (2 slips)
Fx: PIP joint flexion

15

Flexor digitorum profundus (FDP)

Origin: Prox 2/3 of ulna/interossious mem
Insertion: Distal Phalanx
Fx: 2-3 DIP joint flex

16

Flexor Pollicus Longus (FPL)

Origin: mid 1/3 of radius
Insertion: distal phalanx of thumb
Fx: thumb IP joint flex

17

Extrinsic Flexors of Hand Innervated by Ulnar Nerve

Flexor digitorum profundus

18

Flexor digitorum profundus

Origin: Prox 2/3 of ulna/interosseous mem
Insertion: Distal phalanx
Fx: Flex of DIP joints to digits 4-5

19

Extrinsic Extensor Muscles of Hand Innervated by Radial Nerve

Extensor digitorum communis, extensor digiti minimi, extensor indicis proprius, extensor pollicus longus, extensor pollicus brevis, abductor pollicus longus

20

Extensor digitorum communis (EDC)

Origin: Lat epicondyle
Insertion: medial band to mid phalanx & lat band to distal phalanx
Fx: Exten of MCP joints & contributes to exten of IP joints

21

Extensor Digiti Minimi (EDM)

Origin: Lat Epicondyle
Insertion: Into EDC at MCP level of the 5th digit
Fx: Exten of 5th MCP joint & contributes to exten of IP joints

22

Extensor indicis proprius (EIP)

Origin: Mid 1/3 of Ulna
Insertion: Into EDC at MCP level
Fx: Exten of MCP joint of 2nd digit & contributes to exten of IP joints

23

Extensor pollicus longus (EPL)

Origin: Mid 1/3 of Ulna
Insertion: Distal phalanx of thumb
Fx: Exten of thumb IP joint

24

Extensor Pollicus Brevis (EPB)

Origin: Mid 1/3 of Radius
Insertion: Prox phalanx of thumb
Fx: Exten of MCP/CMC joints of thumb

25

Abductor Pollicus Longus (APL)

Origin: Mid 1/3 of ulna/radius
Insertion: 1st metacarpal - radial side
Fx: Abduction/exten of CMC joint

26

Wrist Flexors Innervated by Median Nerve

Flexor Carpi Radialis & Palmaris Longus

27

Flexor Carpis Radialis (FCR)

Origin: Medial epicondyle
Insertion: 2nd/3rd metacarpal, base
Fx: Flex of wrist/radial deviation

28

Palmaris Longus (PL)

Origin: Medial epicondyle
Insertion: Palmar aponeurosis
Fx: wrist flex

29

Wrist flexors innervated by the ulnar nerve

Flexor carpi ulnaris (FCU)

30

Flexor Carpi Ulnaris (FCU)

Origin: Med epicondyle & prox 2/3 of ulna
Insertion: Pisiform & 5th metacarpal
Fx: Flex of wrist/ulnar dev

31

Wrist Extensors Innervated by Radial Nerve

Extensor Carpi Radialis Bervis, Extensor Carpi Radialis Longus & Extensor Carpi Ulnaris

32

Extensor Carpi Radialis Bervis (ECRB)

Origin: Lat epi
Insertion: 3rd metacarpal, base
Fx: wrist exten/radial dev

33

Extensor Carpi Radialis Longus (ECRL)

Origin: Supracondylar ridge of hummerus
Insertion: 2nd metacarpal base
FX: wirst ex/radial dev

34

Extensor Capri Ulnaris (ECU)

Origin: Lat epi
Insertion: 5th Metacarpal
Fx: ulnar dev/wrist exten

35

Volar Forearm Muscles Innervated by Medial Nerve

Pronator teres & quadratus

36

Pronator Teres

Origin: Med epi & coronoid process of ulna
Insertion: Lat surface of radius
Fx: Forearm pronation

37

Pronator Quadratus

Origin: distal ulna
Insertion: distal radius
Fx: forearm pronation

38

Dorsal Forearm Muscles Innervated by Radial Nerve

Supinator

39

Supinator

Orgin: Lat epi & ulna
Insertion: Radius
Fx: Forearm supination