4.7. Tendons in the Hand (Extensor Expansion) Flashcards
Where are the Muscles for the Tendons in the Hand located?
In the Forearm
What are the 2 Broad Categories of Tendons in the Hand?
- Flexor Tendons in the Fingers
- Extensor Tendons in the Fingers
Which Tendons allow for Flexion in the Fingers?
- Flexor Digitorum Profundus
- Flexor Digitorum Superficialis
How do the Flexor Digitorum Profundus and Superficialis enter into the Hand?
Via the Carpal Tunnel
What protects the Flexor Digitorum Profundus and Superficialis in the Hand?
Common Flexor Sheath
What happens to the Common Flexor Sheaths as you travel Distally?
It Fans out into the Digital Synovial Sheaths
Where are the Digital Synovial Sheaths located?
In each Finger
What is the function of the Digital Synovial Sheaths?
To Permit the Free Movement of the Tendons over Each Other during Flexion
- What happens to the Flexor Digitorum Superficialis Tendon, as it enters the Base of the Proximal Phalanx of Each Finger?
- What does this allow for?
- It Splits and Inserts into the Intermediate Phalanx
- The Flexor Digitorum Profundus Tendon to pass through and Insert onto the Distal Phalanx
What happens to the Tendons of the Extensor Digitorum as they reach the Metacarpals?
They Flatten
What do the Tendons of the Extensor Digitorum become as they Flatten?
They become Extensor Expansions (or Hoods)
What happens to the Extensor Expansions (or Hoods)?
They Wrap around the Metacarpal and Proximal Phalanx
What do the Extensor Expansions (or Hoods) Join onto as they Wrap around the Metacarpal and Proximal Phalanx?
The Palmar Plate
What happens to the Extensor Expansions (or Hoods) as they travel Distally?
They Spread Out Further
What does the Further Distal Expansion of the Extensor Expansions (or Hoods) form?
- 1 x Median Band
- 2 x xLateral Bands
