Extensor carpi ulnaris muscle
| Extensor carpi ulnaris muscle |
|---|
|
| Forearm muscles of man |
| origin |
|
Humeral head : humerus ( lateral epicondyle ) ulnar head : ulna ( olecranon ) |
| approach |
| Base of the 5th metacarpal |
| function |
| Extension and abduction of the wrist |
| Innervation |
| Radial nerve of the brachial plexus |
| Spinal segments |
| C7, C8 |
The extensor carpi ulnaris ( Latin for "elle sided hand Tractor" or "ulnar hand Tractor") is an at Elle ( ulna situated), superficial extensor muscle on the forearm . It has two muscle heads : a humeral head (humerus head) and a ulnar head (elbow head). The insertion tendon passes through the sixth tendon sheath compartment of the extensor retinaculum .
function
The extensor carpi ulnaris muscle is responsible for extension and ulnar abduction (bending of the hand in the direction of the little finger) of the hand in the wrist . With continued use, he stretches the elbow joint.
In most quadruped animals, the muscle already acts as a flexor of the forefoot joint, but is still called an "extensor" from a comparative anatomical point of view.
Despite its name, the extensor carpi ulnaris muscle is innervated by the posterior interosseous nerve (nervus interosseus antebrachii posterior, C7 and C8), which is a continuation of the lower branch of the radial nerve .
Tennis elbow ( epicondylitis ) is a common injury to the extensor carpi ulnaris muscle. This injury occurs in those who make repetitive arm, elbow, and wrist movements, especially when an object is firmly gripped.
Individual evidence
- ^ Clinically oriented anatomy . Lippincott Williams & Wil, [Sl] 2009, ISBN 978-1-60831-181-1 , p. 751.