Extensor indicis proprius
| Extensor indicis proprius |
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| Transverse section across distal ends of radius and ulna. (Label "Ext. indic. prop." visible at bottom center.) |
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| 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: |
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| Nerve: |
posterior interosseous nerve |
| Action: |
extends index finger, wrist |
| Dorlands/Elsevier |
m_22/12548933 |
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 images
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List of muscles of upper limbs |
| VERTEBRAL COLUMN |
trapezius - latissimus dorsi - rhomboid (major, minor) - levator scapulae |
| THORACIC WALLS |
pectoralis major - pectoralis minor - subclavius - serratus anterior |
| SHOULDER |
deltoid - rotator cuff (supraspinatus, infraspinatus, teres minor, subscapularis) - teres major |
| ARM |
anterior compartment: coracobrachialis - biceps brachii - brachialis
posterior compartment: triceps brachii - anconeus |
| FOREARM |
anterior compartment: super. - pronator teres - palmaris longus - flexor carpi radialis - flexor carpi ulnaris - flexor digitorum superficialis - deep - pronator quadratus - flexor digitorum profundus - flexor pollicis longus
posterior compartment: super. - mobile wad (brachioradialis, extensor carpi radialis longus and brevis) - extensor digitorum, - extensor digiti minimi - extensor carpi ulnaris - deep - supinator - anatomical snuff box (abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus) - extensor indicis |
| HAND |
lateral volar - thenar (opponens pollicis, flexor pollicis brevis, abductor pollicis brevis, adductor pollicis)
medial volar - palmaris brevis - hypothenar (abductor minimi digiti, flexor digiti minimi brevis, opponens digiti minimi)
intermediate - lumbrical - dorsal interossei - palmar interossei |
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.
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