Extensor digiti minimi
From Ganfyd
| Extensor digiti minimi | |
|---|---|
 | |
| System: | Muscle |
| Function: | Extends the little finger |
| Origin: | Common extensor origin |
| Branches: | |
| Insertion: | Extensor expansion of the little finger |
| Arterial supply: | |
| Venous drainage: | |
| Lymphatic drainage: | |
| Innervation: | Posterior interosseous nerve (C7, C8) |
| Vertebral levels: | |
| Search for Extensor digiti minimi in Gray's. | |
Extensor digiti minimi (extensor digiti quinti proprius) is a muscle of the forearm that extends the little finger.
Contents |
Shape
Extensor digiti minimi is a slim muscle located on the medial side of extensor digitorum. It connects directly with the latter muscle. Its tendon runs through a compartment of the extensor retinaculum behind the distal radioulnar joint, and divides in two as it crosses the hand to reach its insertion.
Actions
- Extends the little finger
Joints Affected
- All joints of the little finger
Origin
- Common extensor origin of the forearm
- Surrounding muscles via intermuscular septa
Insertion
- Extensor expansion of extensor digitorum above the proximal phalanx
Nerve Supply
Variations
- May have a slip from the lateral epicondyle of the radius
- Tendon may not divide
- May send a tendon to the ring finger
- Rarely absent
- Often completely fused with extensor digitorum
