Extensor digitorum lateralis muscle
| Extensor digitorum lateralis muscle (forelimb) |
|---|
| origin |
| Humerus ( lateral epicondyle ) or ligamentum collaterale laterale |
| approach |
| proximal phalanx of lateral toes |
| function |
| External toe extensor |
| Innervation |
| Radial nerve from the brachial plexus |
The extensor digitorum lateralis muscle ( Latin for "lateral toe extensor") does not occur in humans. In quadruped mammals, it is developed on both the fore and hind limbs.
Extensor digitorum lateralis of the forelimb
The lateral toe extensor usually has several bellies in animals with more than 2 supporting toes. It arises from the collateral ligament of the elbow joint or from the lateral epicondyle of the humerus . In animals with more than 2 supporting toes on the pastern, the uniform end tendon of the muscle divides into several legs and extends to the first phalanx ( phalanx proximalis ), in cats the 2nd – 5th, in the dog the 3rd – 5th. Toe. In ungulates , the tendon remains uniform and pulls towards the crown bone of the 4th ( ruminant ) or fetlock bone of the 3rd toe ( horse ).
When passing over the pastern joint, the tendon (s) are covered by a tendon sheath ( vagina tendinis musculi extensoris digitorum lateralis ). Under the tendon is in horses and ruminants at the metatarsophalangeal joint is a bursa ( Bursa musculi subtendinea extensoris digitorum lateralis ).
The muscle stretches the corresponding proximal front toe joints and the carpal joint (tarsal joint).
| Extensor digitorum lateralis muscle (hind limb) |
|---|
| origin |
| Fibula |
| approach |
| lateral toe |
| function |
| Lateral toe extensor |
| Innervation |
| Deep peroneal nerve |
Extensor digitorum lateralis of the hind limb
The lateral toe extensor of the hind limb arises from the fibula . The uniform end tendon connects with the outermost tendon leg of the extensor digitorum longus muscle ( predators 5th toe, ruminants 4th, horse 3rd toe).
The muscle helps extend the outer toe and flexes the ankle .
literature
Franz-Viktor Salomon: muscle tissue . In: Franz-Viktor Salomon, Hans Geyer and Uwe Gille (eds.): Anatomy for veterinary medicine . 3. Edition. Enke, Stuttgart 2015, ISBN 978-3-8304-1288-5 , pp. 219-220 and 245-246 .