Structures of the Hand Flashcards Preview

MRCS Anatomy - Upper Limb > Structures of the Hand > Flashcards

Flashcards in Structures of the Hand Deck (17)
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1
Q

What is the palmar aponeurosis

A

Palmar fascia made of fibrous connective tissue that thickens in the centre of the hand

2
Q

What is the palmar aponeurosis continuous with

A

Palmaris longus tendon

Flexor retinaculum

3
Q

What does the palmar aponeurosis do

A

Protects underlying muscle compartments

4
Q

What are the fibrous digital sheaths

A

Extensions of the palmar aponeurosis

Cover the synovial sheaths in the digits and keep them in place

5
Q

What do the synovial sheaths of the fingers contain

A

Flexor tendons

6
Q

What is the extensor retinaculum

A

Thickening of fascia on dorsum of hand

Keeps extensor tendons in position and prevents bowstringing

7
Q

What are palmar plates

A

Present on palmar side of each MCP and IP joint
Limit hyperextension of digit
Enhances stability

8
Q

Where are the collateral ligaments of the fingers

A

Medial and lateral sides of each MCP and IP joint

9
Q

What do collateral ligaments of the fingers do

A

Taut when fingers flexed, limiting abduction

Lax when fingers extended, allowing abduction

10
Q

Which tendons allow flexion of the fingers

A

Flexor digitorum profundus

Flexor digitorum superficialis

11
Q

Where do the flexor tendons pass (FDP & FDS)

A

Through carpal tunnel
Enter hand where they are protected by common flexor sheath
Enter fingers in digital synovial sheaths

12
Q

What is the course of FDS in the finger

A

FDS tendon splits near base of proximal phalanx

Inserts into intermediate phalanx

13
Q

What is the course of FDP in the finger

A

Passes through split in FDS and inserts onto distal phalanx

14
Q

What happens to extensor tendons of fingers as they reach the metacarpals

A

Flatten and become extensor expansions

15
Q

Where do the extensor expansions go

A

Fan out and warp around metacarpal and proximal phalanx, joining onto palmar plate
Spreads out further distally into a median band and two lateral bands

16
Q

Where does the median band of the extensor tendons attach

A

Middle phalanx

17
Q

Where do the two lateral bands of the extensor tendons attach

A

Distal phalanx