Contents
Position
- Deep
Origin
- Surface of 1-5 metacarpal
Insertion
- The muscles are passing the MCP-joints flexor side. After passing here they attach to the base of proximal phalanx until they continue into the fingers dorsal digital expansion
Main function
- Fingers 2-4 MCP
- Abduction
Secondary function
- Fingers 2-4 MCP
- Flexion
- Fingers 2-4 IP
- Extension
Nerve innervation
- Segmental
- C8-Th1
- Peripheral
- Ulnar nerve
Arterial supply
- Radial artery
- Ulnar artery
Palpation
- Patient position
- Sitting or supine
- The muscle is easily palpatable in the area between the index finger and the thumb
- Feel for contraction in this area while you have the patient:
- Keep the index finger in an abducted position
- Give resistance in the direction of adduction so that the patient generates force into abduction
- Feel for contraction during this activity