Extensor carpi radialis longus muscle

Extensor carpi radialis longus muscle
origin
Humerus ( lateral supracondylar crest )
approach
Base of the second metacarpal
function
Extensor wrist
Innervation
Radial nerve of the brachial plexus
Spinal segments
C6, C7

The extensor carpi radialis longus muscle ( Latin for “long hand extensor on the side of the spokes” or “long radial hand extensor”) is a skeletal muscle of the forearm located on the radius ( radius ) . In humans, it is covered by the brachioradialis muscle . It arises from the lateral supracondylar line of the humerus and from the lateral intermusculare brachii septum. The insertion tendon runs in a common tendon sheath ( vagina tendinum musculi extensorum carpi radialium ) with the insertion tendon of the extensor carpi radialis brevis muscle through the second tendon sheath of the extensor retinaculum .

In domestic animals , it is the strongest forearm muscle and forms the craniolateral contour of the forearm . Since the extensor carpi radialis brevis muscle is not found in domestic animals, the muscle is simply referred to as the extensor carpi radialis muscle . He sits in the ungulates at the tuberosity of the metacarpal III , which tendon is in horses and ruminants of a bursa ( Bursa musculi subtendinea extensoris carpi radialis underlain). In predators, the muscle is suggestively divided into two parts: the medial section starts at the second, the lateral section, which corresponds to the short carpal extensor in humans, starts at the third metatarsal bone. The tendon or tendons in all domestic animals also run in a tendon sheath ( vagina tendinis musculi extensoris carpi radialis ). In small animal neurology, a self-reflex, the extensor carpi-radialis reflex , is also used for diagnosis .

function

The extensor carpi radialis longus muscle stretches the hand in the wrist and contributes about half of its abduction (bending of the hand towards the thumb). He is still involved in the flexion of the forearm in the elbow .

Individual evidence

1. ↑ Walther Graumann: Compact textbook anatomy . tape 2 . Schattauer, 2004, ISBN 978-3-7945-2062-6 , pp. 357 .
2. ↑ Gunther Wennemuth: Anatomy for the Oral Exam: Questions and Answers . 2nd Edition. Springer, 2013, ISBN 978-3-642-56069-9 , pp. 76 .
3. ^ Franz-Viktor Salomon, Hans Geyer and Uwe Gille: Anatomy for veterinary medicine . 2nd Edition. Enke, Stuttgart 2008, ISBN 978-3-8304-1075-1 , pp. 204-205 .
4. ↑ Gerhard Aumüller et al .: Dual series of anatomy . 3. Edition. Georg Thieme, Stuttgart 2014, ISBN 978-3-13-152863-6 , p. 497 .