4.7. Tendons in the Hand (Extensor Expansion) Flashcards Preview

3rd Year - MSK Upper Limb Anatomy > 4.7. Tendons in the Hand (Extensor Expansion) > Flashcards

Flashcards in 4.7. Tendons in the Hand (Extensor Expansion) Deck (18)
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1
Q

Where are the Muscles for the Tendons in the Hand located?

A

In the Forearm

2
Q

What are the 2 Broad Categories of Tendons in the Hand?

A
  1. Flexor Tendons in the Fingers

2. Extensor Tendons in the Fingers

3
Q

Which Tendons allow for Flexion in the Fingers?

A
  1. Flexor Digitorum Profundus

2. Flexor Digitorum Superficialis

4
Q

How do the Flexor Digitorum Profundus and Superficialis enter into the Hand?

A

Via the Carpal Tunnel

5
Q

What protects the Flexor Digitorum Profundus and Superficialis in the Hand?

A

Common Flexor Sheath

6
Q

What happens to the Common Flexor Sheaths as you travel Distally?

A

It Fans out into the Digital Synovial Sheaths

7
Q

Where are the Digital Synovial Sheaths located?

A

In each Finger

8
Q

What is the function of the Digital Synovial Sheaths?

A

To Permit the Free Movement of the Tendons over Each Other during Flexion

9
Q
  1. What happens to the Flexor Digitorum Superficialis Tendon, as it enters the Base of the Proximal Phalanx of Each Finger?
  2. What does this allow for?
A
  1. It Splits and Inserts into the Intermediate Phalanx

2. The Flexor Digitorum Profundus Tendon to pass through and Insert onto the Distal Phalanx

10
Q

What happens to the Tendons of the Extensor Digitorum as they reach the Metacarpals?

A

They Flatten

11
Q

What do the Tendons of the Extensor Digitorum become as they Flatten?

A

They become Extensor Expansions (or Hoods)

12
Q

What happens to the Extensor Expansions (or Hoods)?

A

They Wrap around the Metacarpal and Proximal Phalanx

13
Q

What do the Extensor Expansions (or Hoods) Join onto as they Wrap around the Metacarpal and Proximal Phalanx?

A

The Palmar Plate

14
Q

What happens to the Extensor Expansions (or Hoods) as they travel Distally?

A

They Spread Out Further

15
Q

What does the Further Distal Expansion of the Extensor Expansions (or Hoods) form?

A
  1. 1 x Median Band

2. 2 x xLateral Bands

16
Q

What does the Median Band, formed by the Extensor Expansions (or Hoods), attach to?

A

Intermediate (Middle) Phalanx

17
Q

What do the Lateral Bands, formed by the Extensor Expansions (or Hoods), attach to?

A

Distal Phalanx

18
Q

What effect does contraction of the Extensor Digitorum Muscle have on its Tendon?

A

It Tightens the Tendon, Extending the Intermediate and Distal Phalanges

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