4.1.2. Extensor Muscles of the Medial 4 Digits Flashcards
What are the Muscles of the Posterior Forearm commonly known as?
Extensor Muscles
What is the General Function of these Muscles?
To Produce Extension at the Wrists and Fingers
Which Nerve innervates the Muscles of the Posterior Forearm?
The Radial Nerve
- How many groups can the Muscles of the Posterior Forearm be Divided into, Anatomically?
- What are they?
- 2
- a) Superficial Muscles of the Posterior Forearm
- b) Deep Muscles of the Posterior Forearm
- How many groups can the Muscles of the Posterior Forearm be Divided into, Functionally?
- What are they?
- 3
- a) Muscles which Extend and Abduct / Adduct the Hand at the Wrist Joint
- b) Muscles which Extend the Medial 4 Digits
- c) Muscles which Extend or Abduct the Thumb
What are the 3 Muscles which Extend the Medial 4 Digits?
- Extensor Digitorum
- Extensor Indicis Proprius
- Extensor Digiti Minimi
Is the Extensor Digitorum an Anatomically Superficial or Deep Muscle of the Posterior Forearm?
Superficial
Where does the Extensor Digitorum Originate from?
Lateral Epicondyle of the Humerus
What happens to the Extensor Digitorum, as it travels into the Distal Forearm?
It’s Flesh Belly Ends in a Tendon which passes under the Extensor Reinaculum, and then Divides into 4
Where does the Extensor Digitorum attach distally?
Extensor Hood of Medial 4 Digits (the Fingers)
What is the function of the Extensor Digitorum?
It is the Main Extensor of the Fingers:
- Extension of the Medial 4 Digits at the Metacarpophalangeal Joint
- Extension of the Medial 4 Digits at the Interphalangeal Joint
What is the innervation of the Extensor Digitorum?
Deep Branches of the Radial Nerve
How is the Extensor Digitorum function tested?
The Forearm is Pronated and the Fingers are Extended against Resistance
Is the Extensor Indicis Proprius an Anatomically Superficial or Deep Muscle of the Posterior Forearm?
Deep
Where does the Extensor Indicis Proprius Originate from?
- Posterior Surface of the Ulna
2. Interosseous Membrane, Distal to the Extensor Pollicus Longus