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Flashcards in Hand Deck (39)
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Carpal tunnel formed by...

Passageway deep to the flexor retinaculum between tubercles of the scaphoid and the trapezoid bones on the lateral side. And the pisiform and hook of hamate medially.

1

Carpal tunnel contents

9 tendons , 1 nerve

Flexor pollicis longus, flexor digitorum superficialis, and flexor digitorum profundus.

2

Radial nerve

Terminal branches, superficial and deep arise in the cubital fossa

3

Superficial branch of radial nerve

Is entirely sensory

It pierces the deep fascia near the dorsum of the wrist to supply the skin and fascia over the lateral 2/3 of the dorsum of the hand, the dorsum of the thumb, and the proximal parts of the lateral one and a half digits.

4

Augmenting movement at the wrist joint

The two rows of carpals glide on each other; in addition, each bone glides on those adjacent to it

5

Proximal phalanges articulate with

Metacarpal bones at the metacarpophalangeal joints

6

The joint between proximal and middle phalanx is the

Proximal interphalangeal joint

7

Ulnar nerve and artery travel through what canal to get to the wrist?

Guyons canal
Anterior to the flexor retinaculum between the pisiform and the hook of hamate

8

Fibrous digital sheaths

Synovial sheaths that enclose the flexor tendons as they pass along the palmar aspect of each digit. Fiction similar to retinaculum

9

What kind of joint is Metacarpophalangeal ?

Condyloid synovial

10

Metacarpophalangeal joint reinforced posteriorly by? Anteriorly?

Posteriorly by dorsal hood
Anteriorly by volar plates

11

Mcp joint collateral ligaments

Pass posterior to joint axis for flexion and extension

Relaxed when in flexion... If immobilized for long cant make fist

12

Blood supply for metacarpophalangeal joint

Deep digital arteries arising from superficial palmar arches

13

Interphalangeal joint is a ____ joint

Hinge synovial joint

14

Ip joint ligaments

Volar plate
Lateral and accessory collateral ligs

Taut in 25 degrees flexion

Joint blood supply via digital arteries

15

Thumb carpometacarpal joint is a ____ joint

Synovial Saddle joint
Lots of mobility ...little stability

16

5 ligaments of the cmc thumb joint

Radial and ulnar collaterals
Anterior and posterior obliques
Intermetacarpal

17

Thumb mcp joint is a _____ joint and what ligaments

Hinge joint

Collateral and palmar ligaments

18

Ulnar artery enters wrist where?

Guyons canal lateral to ulnar nerve

Anterior to flexor retinaculum

19

Ulnar artery gives rise to ...

Deep and superficial palmar branch

Superficial portion contributes to superficial palmar arch

20

Radial artery enters wrist?

By curving dorsally around scaphoid and trapezium in the floor of anatomy snuff box

21

Extensor mechanism

Complex network of ligamentous and muscular units that coordinate to produce extension of the digits

22

Oblique retinacular ligament

Is taut during flexion of dip...hence it pulls pip into flexion

Part of extensor mechanism

23

Mallet finger

Basketball jam finger example

Torn extensor ligaments so dip is stuck in flexion

24

Dupuytren contracture

Palmar fascia thickens and pulls finger into flexion

25

Digital tenovaginitis stenosans (trigger finger)

Thickened annular lig of fibrous digital sheath due to repetitive overuse

Can flex but have to manually extend it

26

Palmar aponeurosis

Part of deep fascia of palm
Covers the soft tissue and overlies the long flexor tendons
The proximal end is continuous with flexor retinaculum and palmaris longus tendon
Distally it forms four longitudinal digital bands which attach to bases of proximal phalanges, where they become continuous with the fibrous digital sheaths

27

Acting together the dorsal and palmar interossei and lumbricals produce

Flexion at the metacarpophalangeal joint and extension of the ip joints..... L

28

The common flexor and digital sheaths enable the tendons

To slide freely past each other during movements of the fingers

29

Ulnar artery of palm

Gives rise to the deep (palmar branch) and then continues superficial to the long flexor tendons, where it is the main contributor to the superficial palmar arch

30

Superficial palmar arch gives rise

To three common palmar digital arteries
Each common palmar d.a. Divides into a pair of proper palmar digital arteries

31

The radial artery curves dorsally

Around the scaphoid and trapezium in the floor of the a.s.b. and enters palm by passing the heads of the first interossei muscle

32

The radial artery ends by anastomosing with the deep branch of the ulnar artery to form the ...

The Deep palmar arch....formed chiefly by the radial artery

33

Extensor expansion or hood is a...

Triangular tendinosis aponeurosis wrapping around dorsum and sides of met heads and base proximal phalanx

34

ED is forming hood splits

Into median band( base of middle phalanx) and 2 lateral bands (base distal phalanx)

35

Hood is anchored on the side by...

Palmar ligament

36

Tendons of interossei and lumbricals join

Lateral bands

37

ORL is taut during flexion of ___ and this pulls the ____ into flexion.

DIP


PIP

38

Extending the ____ joint pulls ____ via ORL into extension

PIP

DIP