Extensor carpi radialis longus muscle
239340
225058632
2008-07-11T18:07:37Z
VolkovBot
3035831
robot Modifying: [[ar:عضلة كعبرية طويلة باسطة للرسغ]]
{{Muscle infobox |
Name = Extensor carpi radialis longus |
Latin = musculus extensor carpi radialis longus |
GraySubject = 125 |
GrayPage = 452 |
Image = ECR-longus.png |
Caption = Superficial muscles of the foreamr. Extensor carpi radialis longus visible in blue. |
Image2 = Gray422.png |
Caption2 = Transverse section across the wrist and digits. (Ext. carp. rad. long. labeled at center left.) |
Origin = [[lateral supracondylar ridge]] |
Insertion = [[2nd metacarpal]] |
Blood = [[radial artery]] |
Nerve = [[radial nerve]] |
Action = [[extensor]] at the [[wrist joint]], [[Abduction (kinesiology)|abducts]] the [[hand]] at the [[wrist]] |
Antagonist = [[Flexor carpi radialis muscle]] |
MeshName = |
MeshNumber = |
DorlandsPre = m_22 |
DorlandsSuf = 12548862 |
}}
'''Extensor carpi radialis longus''' is one of the five main [[muscle]]s that control movement at the [[wrist]]. This muscle is quite long, starting on the lateral side of the humerus, and attaching to the base of the [[second metacarpal bone]] of the [[index finger]].
It initially runs along with [[brachioradialis]], but becomes mostly tendon early on, running between [[brachioradialis]] and [[extensor carpi radialis brevis]].
==Function==
As the name suggests, this muscle is an extensor at the wrist [[joint]], and travels along the radial side of the arm, so will also abduct the hand at the wrist. That is, it manipulates the wrist so as to move the hand towards the [[thumb]] (i.e., [[abduction]]—away from the midline of the body) and away from the palm (i.e., [[extension (kinesiology)| extension]]—increased angle between the palm and the front of the forearm).
==Origin and insertion==
It arises from the lower third of the [[lateral supracondylar ridge]] of the [[humerus]], from the [[lateral intermuscular septum of arm| lateral intermuscular septum]], and by a few fibers from the common tendon of origin of the Extensor muscles of the forearm.
The fibers end at the upper third of the forearm in a flat tendon, which runs along the lateral border of the radius, beneath the [[Abductor pollicis longus]] and [[Extensor pollicis brevis]]; it then passes beneath the [[dorsal carpal ligament]], where it lies in a groove on the back of the radius common to it and the [[Extensor carpi radialis brevis]], immediately behind the [[styloid process (radius)|styloid process]]. It is inserted into the dorsal surface of the base of the [[second metacarpal bone]], on its radial side.
==Innervation==
Being an extensor contained in the forearm, it is innervated by the [[radial nerve]].
==Exercises==
The muscle, like all extensors of the forearm, can be [[strength training|strengthened]] by exercise that resist its extension. A [[wrist roller]] can be used and [[wrist curl|reverse wrist curls]] with [[dumbbell]]s can performed.
{{-}}
==Additional images==
<gallery>
Image:Gray214.png|Bones of left forearm. Posterior aspect.
Image:Gray220.png|Bones of the left hand. Dorsal surface.
Image:Gray416.png|Tendons of forefinger and vincula tendina.
Image:Gray417_color.PNG|Cross-section through the middle of the forearm.
Image:Gray419.png|Posterior surface of the forearm. Deep muscles.
Image:Gray421.png|Transverse section across distal ends of radius and ulna.
Image:Gray424.png|The mucous sheaths of the tendons on the back of the wrist.
</gallery>
==External links==
* {{GPnotebook|-1912209407}}
{{Muscles of upper limb}}
[[Category:Muscles of the upper limb]]
[[ar:عضلة كعبرية طويلة باسطة للرسغ]]
[[de:Musculus extensor carpi radialis longus]]
[[es:Primer radial externo]]
[[fr:Muscle long extenseur radial du carpe]]
[[hr:Dugi radijalni ispružač zapešća]]
[[id:Otot extensor carpi radialis longus]]
[[hu:Hosszú orsócsonti csuklófeszítő izom]]
[[ja:長橈側手根伸筋]]
[[pl:Mięsień prostownik promieniowy długi nadgarstka]]
[[sv:Extensor carpi radialis longus]]
[[th:กล้ามเนื้อเอกซ์เทนเซอร์ คาร์ไพ เรเดียลิส ลองกัส]]