Extensor indicis muscle

Extensor indicis muscle

Infobox Muscle
Name = Extensor indicis proprius
Latin = musculus extensor indicis
GraySubject = 125
GrayPage = 456


Caption = Transverse section across distal ends of radius and ulna. (Label "Ext. indic. prop." visible at bottom center.)


Caption2 = The mucous sheaths of the tendons on the back of the wrist. (Extensor indicis proprius visible going into second digit.)
Origin = ulna
Insertion = index finger (extensor hood)
Blood =
Nerve = posterior interosseous nerve
Action = extends index finger, wrist
Antagonist =
DorlandsPre = m_22
DorlandsSuf = 12548933
The extensor indicis proprius (Extensor indicis) is a narrow, elongated muscle, placed medial to, and parallel with, the extensor pollicis longus.

Origin and insertion

It arises from the dorsal surface of the body of the ulna below the origin of the Extensor pollicis longus and from the interosseous membrane.

Its tendon passes under the dorsal carpal ligament in the same compartment as that which transmits the tendons of the Extensor digitorum communis, and opposite the head of the second metacarpal bone, joins the ulnar side of the tendon of the Extensor digitorum communis which belongs to the index finger.

Action

The Extensor indicis proprius extends the index finger, and by its continued action assists in extending the wrist.


=Additional

External links

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* - "Extensor Region of Forearm and Dorsum of Hand: Deep Muscles of Extensor Region"
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