Contents
Anatomy
General information
- This section is strictly limited to anatomy, you might be looking for clinical relevant information which is found under the clinical chapters -- muscles section, click here to go to that page
- Is a part of the lower arms posterior deep muscle group
Position
- Deep
Origin
- Posterior ulna
- Distal 1/3
- Posteriore interosseus membran
- Distal 1/3
Insertion
- Dorsal aponeurosis 2. finger
Main function
- Wrist
- Extension
- Index finger MCP
- Extension
- Index finger PIP
- Extension
- Index finger DIP
- Extension
Secondary function
- RU-joint
- Supination
- Index finger MCP
- Adduction
Nerve innervation
- Segmental
- C7-C8
- Peripheral
- Posterior interosseous nerve
Arterial supply
- Posterior interosseous artery
- Anterior interosseous artery
Palpation
- Patient position
- Sitting
- Ask the patient to keep the lower arm in full pronation
- Place your hand at the distal 1/3 of ulna posteriorly
- Ask the patient to extend the index finger while you feel for the contraction