Extensor indicis muscle
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| Extensor indicis proprius | |
|---|---|
 | |
| Transverse section across distal ends of radius and ulna. (Label "Ext. indic. prop." visible at bottom center.) | |
 | |
| The mucous sheaths of the tendons on the back of the wrist. (Extensor indicis proprius visible going into second digit.) | |
| Latin | musculus extensor indicis |
| Gray's | subject #125 456 |
| Origin | ulna |
| Insertion | index finger (extensor hood) |
| Artery: | |
| Nerve: | posterior interosseous nerve |
| Action: | extends index finger, wrist |
| Dorlands /Elsevier | m_22/12548933 |
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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 images
 Bones of left forearm. Posterior aspect. |
Musculusextensorindicisproprius.png
Posterior surface of the forearm. Deep muscles. |
 Transverse section across the wrist and digits. |
External links
- LUC exi
- SUNY Labs 09:05-0106 - "Extensor Region of Forearm and Dorsum of Hand: Deep Muscles of Extensor Region"
- Norman/Georgetown lesson5musofpostforearm
- Duke Orthopedics extensor_indicis
- Extensor+indicis+muscle at eMedicine Dictionary
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.ar:العضلة المخصوصة الباسطة للسبابة de:Musculus extensor indicishu:Musculus extensor indicis propriusth:กล้ามเนื้อเอกซ์เทนเซอร์ อินดิซิส
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
